JP6832052B2 - Covering material for plant cultivation - Google Patents

Description

The present invention relates to a plant cultivation covering material used when cultivating plants such as flowers and vegetables in a greenhouse.

Conventionally, this kind of plant cultivation coating material is effective as a heat retention measure in winter.
However, since the coating material for plant cultivation is inferior in air permeability, the temperature of the cultivation area in the greenhouse rises more than necessary during the daytime from spring to autumn, which hinders the healthy growth of plants and causes a high temperature. It could cause disability. Examples of high temperature damage include poor growth, leaf burning, leaf fall, withering, frequent occurrence of pests, and decreased yield.
In particular, when the plant is a flower, in addition to the above-mentioned high temperature damage, there are problems such as flowering (flowering condition) and flower color (flowering color) that greatly affect the commercial value.
As an example of measures against high temperature of such plants, there is an agricultural coating material for leek cultivation made of a thermoplastic resin film containing titanium oxide and an ultraviolet absorber (see, for example, Patent Document 1).
The agricultural coating material for nira cultivation described in Patent Document 1 below has a light transmittance of less than 5% in the ultraviolet region having a wavelength of less than 380 nm, and an average transmittance of light in the ultraviolet region of 380 or more and less than 400 nm. The average transmittance of light rays in the visible light region of 15% or less and 400 nm or more and less than 700 nm is 75% or more, and the average transmittance of light rays in the near-infrared light region of 700 nm or more and less than 2000 nm. It is set to 85% or less. As a result, the transmission of light rays in the near-infrared light region is reduced, and while suppressing the temperature rise in the house, the light rays that have the wavelength required for growing agricultural products in the visible light region are sufficiently transmitted, which is a cause of disease. Can block ultraviolet rays. Furthermore, by setting the direct light transmittance of the transmitted light in the near-infrared light region having a wavelength of 700 nm or more and less than 2000 nm to 40 to 75%, the direct light directly irradiating the leek is reduced and softened, and the leek leaves are softened. It prevents discoloration of the tip of the leek and deterioration of the appearance due to twisting of the leaf itself.

Japanese Unexamined Patent Publication No. 2007-22221

However, in such a conventional agricultural coating material for leeks cultivation, the transmission rate of ultraviolet rays having a wavelength of less than 400 nm is suppressed to 15% or less, so that plants other than allioideae green and yellow vegetables such as leeks are cultivated in a greenhouse. When used in, there is a risk that the foliage of the plant will grow longer (unnecessarily grow more than usual) due to lack of ultraviolet rays, and the plant will become sick or weaker than a normally grown plant, resulting in poor growth.
Furthermore, if the direct light transmittance of near-infrared light that is directly applied to plants is reduced to 40 to 75%, in the case of plants other than Chinese chive, the near-infrared light is insufficient and photosynthetic activity is carried out. There was also a problem that it was lowered and poor growth was caused.

The present invention makes it an example of a problem to deal with such a problem. That is, it is an object of the present invention to prevent the growth of plants and the decrease in photosynthetic rate while suppressing the temperature rise in the greenhouse and to grow them soundly.

In order to achieve such an object, the coating material for plant cultivation according to the present invention has at least the constitution according to the following independent claims.
[Claim 1] A coating material for plant cultivation used in a plant cultivation facility containing flowers while the transparent substrate film formed by the inflation manufacturing method is used as it is.
The substrate film is an outer layer containing low-density polyethylene as a main component and an intermediate layer containing an ethylene-vinyl acetate copolymer as a main component and containing a temperature rise inhibitor that suppresses the transmission of light in the near-infrared light region. When ethylene - an inner layer consisting mainly of vinyl acetate copolymer, is formed into a three-layer structure of the ethylene in the intermediate layer - other total vinyl acetate copolymer and the Atsushi Nobori agents 100 The ultraviolet region containing 77.25 to 83.35% by weight of the ethylene-vinyl acetate copolymer, 4.00 to 10.00% by weight of the temperature rising inhibitor, and a wavelength of 290 to 400 nm with respect to% by weight. The average transmission rate of light rays of 325 nm is 20 to 45%, the average transmission rate of light rays in the visible light region having a wavelength of 400 to 700 nm is 75 to 85%, and the wavelength is close to 700 to 1200 nm. A coating material for plant cultivation, characterized in that the average transmission rate of 800 nm light among light rays in the infrared light region is 70 to 86%.

The coating material for plant cultivation of the present invention having such characteristics can obtain the amount of transmitted ultraviolet light required for plants by setting the transmittance of light rays in the ultraviolet region having a wavelength of 290 to 400 nm to 20% or more. It grows up without being overwhelmed. Further, heat shielding property can be obtained by setting the transmittance of light rays in the near-infrared light region having a wavelength of 700 to 1200 nm to 86 % or less and cutting near-infrared light having a wavelength of 1200 nm or more having a thermal effect. In addition to this near-infrared light, the photosynthesis of plants is promoted by the Emerson effect by setting the transmittance of light in the visible light region having a wavelength of 400 to 700 nm to 75% or more.
Therefore, it is possible to prevent the growth of plants and the decrease in photosynthetic rate while suppressing the temperature rise in the greenhouse and to grow them soundly. Especially in the case of flowers, it is possible to improve flower attachment (flower attachment condition) and flower color (flower hue). In the case of vegetables, the yield can be improved.
As a result, compared to the conventional one in which the transmittance of ultraviolet rays having a wavelength of less than 400 nm is suppressed to 15% or less, it does not become sick or weak due to insufficient amount of transmitted light of ultraviolet rays and does not cause poor growth, especially in the case of flowers. , The product value can be improved. In the case of vegetables, the production volume can be improved.

Hereinafter, embodiments of the present invention will be described in detail.
The coating material for plant cultivation according to the embodiment of the present invention is used in cultivation facilities such as houses and tunnels for cultivating plants such as flowers and vegetables in a greenhouse.
More specifically, the coating material for plant cultivation according to the embodiment of the present invention comprises at least one layer of a transparent substrate film containing an olefin resin as a main component.
The substrate film has an average transmittance of 20% or more for light rays in the ultraviolet region having a wavelength of 290 to 400 nm, an average transmittance of 75% or more for light rays in the visible light region having a wavelength of 400 to 700 nm, and a wavelength of 75% or more. The average transmittance of light in the near-infrared light region of 700 to 1200 nm is set to 86% or less.
Further, the lower limit of the average transmittance of light rays in the near infrared light region having a wavelength of 700 to 1200 nm is preferably set to 70 or more, that is, 70 to 86%.
In order to realize such a range of transmittance, the substrate film is provided with an ultraviolet absorber for suppressing the transmittance of light rays in the ultraviolet region and near infrared rays for suppressing the transmittance of light rays in the near infrared light region. Contains absorbents and the like.

Known UV absorbers used include, for example, (2- [5-chloro (2H) -benzotriazole-2-yl] -4-methyl-6- (tert-butyl) phenol) (maximum absorption wavelength: 353 nm). ) And 2,4-di-tert-butyl-6- (5-chlorobenzotriazole-2-yl) phenol (maximum absorption wavelength: 352 nm), 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-Hydroxybenzophenones such as 2-hydroxy-4-octoxybenzophenone, 5,5'-methylenebis (2-hydroxy-4-methoxybenzophenone); 2- (2'-hydroxy-5'-methylphenyl) benzotriazole , 2- (2'-Hydroxy-3', 5'-ditertiary butylphenyl) benzotriazole, 2- (2'-hydroxy-3', 5'-ditertiary butylphenyl) -5-chlorobenzotriazole , 2- (2'-Hydroxy-3'-3rd butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'-3rd octylphenyl) benzotriazole, 2- 2- (2'-Hydroxyphenyl) such as (2'-hydroxy-3'.5'-dicumylphenyl) benzotriazole, 2,2'-methylenebis (4-third octyl-6-benzotriazolyl) phenol, etc. ) Bentriazoles; phenylsalicylate, resorcinol monobenzoate, 2,4-ditertiary butylphenyl-3', 5'-ditertiary butyl-4'-hydroxybenzoate, 2,4-ditertiary amylphenyl-3 Benzoates such as', 5'-ditertiary butyl-4'-hydroxybenzoate, hexadecyl-3,5-ditertiary butyl-4-hydroxybenzoate; 2-ethyl-2'-ethoxyoxanilide, 2- Substituted oxanilides such as ethoxy-4'-dodecyloxanilide; cyano such as ethyl-α-cyano-β, β-diphenyl acrylate, methyl-2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate Alacrylates; 2- (4,6-diphenyl-1,3,5-triazine-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4,6-bis (2,4-dimethyl) Examples thereof include triazines such as phenyl) -1,3,5-triazine-2-yl] -5- (octyloxy) phenol.
Inorganic oxide-based ultraviolet absorbers such as zinc oxide and cerium oxide can also be mentioned. These ultraviolet absorbers are used alone or in combination of two or more.

As a specific example of the substrate film, a single-layer structure made of the same resin or a plurality of structures in which a plurality of different resins are integrally laminated is used.
As a typical example of the plurality of structures, it is preferable to use a three-layer structure composed of an outer layer, an intermediate layer and an inner layer.
Further, as another example, it is also possible to use a two-layer structure of an outer layer and an inner layer or a multi-layer structure of four or more layers.
Hereinafter, a case where the substrate film has a three-layer structure will be described.

[About the outer layer]
The outer layer is a layer containing metallocene-catalyzed linear low-density polyethylene (metallocene-based LLDPE) as the main component as an olefin-based resin that has comprehensively excellent properties such as tearing, tensile strength, piercing strength, and pinhole resistance. To do. A specific example of the metallocene-based LLDPE is FV203 manufactured by Sumitomo Chemical Co., Ltd.
Further, the outer layer contains an ultraviolet absorber in order to suppress the transmittance of light rays in the ultraviolet region, and also contains a light stabilizer, an antioxidant (antioxidant) and the like.
Specific examples of the ultraviolet absorber include a benzophenone-based MAF-23 manufactured by Akishima Chemical Industry Co., Ltd.
Specific examples of the light stabilizer include Chinubin 622-LD manufactured by Ciba Specialty Chemicals.
Specific examples of the antioxidant include the phenolic Irganox 1010 manufactured by Ciba Specialty Chemicals.

[About the middle layer]
The intermediate layer is a layer containing an ethylene-vinyl acetate copolymer (EVA) containing 10% or more of vinyl acetate (VA) as a main component as an olefin resin having excellent tensile strength. As a specific example of EVA, NUC3224 (VA15%) of NUC (former company name: Nippon Unicar) is applicable.
Furthermore, the intermediate layer contains an ultraviolet absorber and a near-infrared absorber for suppressing the transmittance of light in the near-infrared light region, and in addition, a light stabilizer and an antioxidant (antioxidant). In addition, an antifogging agent, an antifogging agent, a heat retaining agent, etc. are blended.
Specific examples of the near-infrared absorber include the temperature rise inhibitor PEX ST-0049 manufactured by Tokyo Ink Co., Ltd.
A specific example of the antifogging agent is Sunthruzer 810 manufactured by Kao Corporation.
Specific examples of the anti-fog agent include surflon manufactured by AGC Seimi Chemical Co., Ltd.
It is preferable to use hydrotalcite as the heat insulating agent. Hydrotalcite has excellent properties as a heat insulating agent because it has infrared absorption performance and a refractive index almost the same as that of ethylene-vinyl acetate copolymer and metallocene-catalyzed linear low-density polyethylene. As a specific example of hydrotalcite, DHT-4A manufactured by Kyowa Chemical Industry Co., Ltd. is applicable.

[About the inner layer]
The inner layer is a layer mainly composed of an ethylene-vinyl acetate copolymer (EVA) containing 5 to 10% vinyl acetate (VA). As a specific example of EVA, NUC3223 (VA5%) of NUC (former company name: Nippon Unicar) is applicable.
Further, the inner layer contains an ultraviolet absorber, a light stabilizer, an antioxidant (antioxidant), an antifogging agent, an antifog agent, and the like.

[Production method]
The inflation process, shaping the base fill beam of multi-layer structure into a tubular shape with an inner layer of the outside. Then, one place on the side or the center of the tube is incised and wound into a roll to form a substrate film.
In addition to the above-mentioned additives, various additives (lubricant, heat stabilizer, colorant, antistatic agent, etc.) are added to each resin layer in a normal amount as necessary when molding the substrate film. be able to.

According to the coating material for plant cultivation according to the embodiment of the present invention, it is necessary for plants such as flowers and vegetables by setting the transmittance of light rays in the ultraviolet region having a wavelength of 290 to 400 nm to 20% or more. The amount of transmitted light of ultraviolet rays is obtained, and it grows without any lengthening.
Further, heat shielding property can be obtained by setting the transmittance of light in the near-infrared light region having a wavelength of 700 to 1200 nm to 86 % or less and cutting near-infrared light having a wavelength of 1200 nm or more having a thermal effect.
In addition to this near-infrared light, by setting the transmittance of light in the visible light region having a wavelength of 400 to 700 nm to 75% or more, photosynthesis of plants is promoted by the Emerson effect.
Therefore, it is possible to prevent the growth of plants and the decrease in photosynthetic rate while suppressing the temperature rise in the greenhouse and to grow them soundly.
As a result, it does not become sick or weak due to insufficient amount of transmitted light of ultraviolet rays and causes poor growth.
In particular, when the plant is a flower, it is possible to improve the flowering (the degree of flowering) and the flower color (the color of the flower).
Moreover, when the plant is a vegetable, the yield can be improved.

In particular, when the transmittance of light rays in the near-infrared light region is 70 to 86%, the light rays in the visible light region and the light rays in the near-infrared light region are sufficient for plants such as flowers. It is irradiated and photosynthesis is further promoted.
Therefore, it is possible to further improve the flower attachment (flower attachment condition), flower color (flower hue) or yield of the flower.
As a result, especially in the case of flowers, the commercial value can be further improved, and in the case of vegetables, the production amount can be further improved.

Examples of the present invention will be described below.
[Examples 1 to 4 and Comparative Examples 1 to 5]
In Examples 1 to 4 shown in Table 1 and Comparative Examples 1 to 4 shown in Table 2, the components described therein are mixed at their respective ratios and subjected to inflation molding processing by an inflation molding machine to obtain an outer layer, an intermediate layer and an inner layer. This is a coating material for plant cultivation in which a film body having a three-layer structure composed of the above is processed so that the thickness balance (layer ratio) of each and the total thickness of the film body have set dimensions.
The layer ratio of the outer layer, the intermediate layer and the inner layer is set to 1: 3: 1, and the total thickness of the film body is set to 0.1 mm.
In the outer layers of Examples 1 to 3 and Comparative Examples 1 to 4, 0.50% by weight of the light stabilizer and 0.10% by weight of the antioxidant (antioxidant) were blended, respectively, to form a common configuration. ..
In the intermediate layers of Examples 1 to 3 and Comparative Examples 1 to 4, the heat insulating agent was 10.00% by weight, the light stabilizer was 0.50% by weight, the antifogging agent was 2.00% by weight, and the antioxidant (antioxidant). The oxidant) is blended in an amount of 0.10% by weight, respectively, to form a common structure.
In the inner layers of Examples 1 to 3 and Comparative Examples 1 to 4, the antifogging agent was 2.50% by weight, the light stabilizer was 0.50% by weight, and the antioxidant (antioxidant) was 0.10% by weight. The common composition is that 0.10% by weight of each of the antifogging agents is blended.

More specifically, in Example 1, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, and EVA (15% VA) was 77.25% by weight in the intermediate layer. 10.00% by weight of infrared absorber (PEX ST-0049), 0.10% by weight of anti-fog agent, 0.05% by weight of ultraviolet absorber, and 96.75 EVA (VA 5%) in the inner layer. It contains 0.05% by weight and 0.05% by weight of the ultraviolet absorber. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 20%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 75%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 75%. It is set.
In Example 2, 99.20% by weight of metallocene-based LLDPE and 0.20% by weight of an ultraviolet absorber were blended in the outer layer, and 83.10% by weight of EVA (15% VA) and a near-infrared absorber (near infrared absorber) were added to the intermediate layer. PEX ST-0049) is blended at 4.00% by weight, anti-fog agent at 0.10% by weight, and UV absorber at 0.20% by weight, and EVA (VA5%) at 96.60% by weight and UV rays in the inner layer. 0.20% by weight of each absorbent is blended. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 20%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 85%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 85%. It is set.
In Example 3, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, and EVA (15% VA) was 81.25% by weight and a near-infrared absorber (near infrared absorber) in the intermediate layer. PEX ST-0049) is blended at 6.00% by weight, anti-fog agent at 0.10% by weight, and UV absorber at 0.05% by weight, and EVA (VA5%) is 96.75% by weight and UV absorption in the inner layer. Each agent is blended in an amount of 0.05% by weight. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 40%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 82%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 82%. It is set.
In Example 4, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, and 83.35% by weight of EVA (15% VA) and a near-infrared absorber (near infrared absorber) were added to the intermediate layer. PEX ST-0049) was blended at 4.00% by weight and UV absorber was blended at 0.05% by weight, respectively, and no antifogging agent was blended. EVA (VA5%) was blended at 96.75% by weight in the inner layer and UV absorber. Are compounded in an amount of 0.05% by weight, respectively. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 45%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 85%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 86%. It is set.

On the other hand, in Comparative Example 1, 98.40% by weight of metallocene-based LLDPE and 1.00% by weight of an ultraviolet absorber were blended in the outer layer, and 84.30% by weight of EVA (15% VA) and near-infrared absorption were absorbed in the intermediate layer. 2.00% by weight of the agent (PEX ST-0049), 0.10% by weight of the anti-fog agent, 1.00% by weight of the ultraviolet absorber, and 95.80% by weight of EVA (VA 5%) in the inner layer. , UV absorber is blended in 1.00% by weight, respectively. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 0%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 88%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 87%. It is set.
In Comparative Example 2, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, 67.25% by weight of EVA (15% VA) was mixed in the intermediate layer, and a near-infrared absorber (near infrared absorber). 20.00% by weight of PEX ST-0049), 0.10% by weight of anti-fog agent, 0.05% by weight of ultraviolet absorber, and 96.75% by weight of EVA (5% VA) and ultraviolet rays in the inner layer. Each contains 0.05% by weight of an absorbent. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 20%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 70%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 65%. It is set.
In Comparative Example 3, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, 62.25% by weight of EVA (15% VA) was mixed in the intermediate layer, and a near-infrared absorber (near infrared absorber). 25.00% by weight of PEX ST-0049), 0.10% by weight of anti-fog agent, 0.05% by weight of ultraviolet absorber, and 96.75% by weight of EVA (5% of VA) and ultraviolet rays in the inner layer. Each contains 0.05% by weight of an absorbent. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 20%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 65%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 60%. It is set.
In Comparative Example 4, 99.35% by weight of metallocene-based LLDPE and 0.05% by weight of an ultraviolet absorber were blended in the outer layer, 87.35% by weight of EVA (15% VA) and 0% of the ultraviolet absorber in the intermediate layer. A near-infrared absorber and an anti-fog agent were blended in an amount of 0.05% by weight, respectively, and EVA (VA 5%) was blended in an inner layer at 96.75% by weight and an ultraviolet absorber was blended in an amount of 0.05% by weight. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 20%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 92%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 90%. It is set.
In Comparative Example 5, a general-purpose agricultural polyolefin-based special film (overall thickness 0.1 mm) is used as the film body, and a light-shielding net is arranged on the general-purpose agricultural polyolefin-based special film to constantly cover the agricultural polyolefin-based special film. As a result, the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 10%, the average transmittance measured with visible light having a wavelength of 400 to 700 nm is 10%, and the average transmittance measured with near infrared rays having a wavelength of 800 nm is 10%. It is set.

The evaluation results (growth state, presence / absence of high temperature damage, flowering / flower color or yield, comprehensive evaluation) shown in Tables 1 and 2 are based on the following indexes.
Using the plant cultivation dressings of Examples 1 to 4 and Comparative Examples 1 to 5, flowers and vegetables were cultivated in a greenhouse as plants.
As flowers, we conducted experiments on sweet pea, a leguminous plant that is prone to high temperature damage, and Phalaenopsis orchid, an orchidaceous plant.
As vegetables, we conducted experiments on strawberry, a Rosaceae plant that is prone to high temperature damage.
The cultivation period is from September to June of the following year for sweet pea, from October to June of the following year for Phalaenopsis orchid, and from September to June of the following year for sweet pea. Cultivation experiments were conducted in different places.
In addition, for the cultivation of Phalaenopsis orchids, a shading net was also used at high temperatures during the daytime as needed.

The "growth state" is the result of observing the plants (sweet pea, Phalaenopsis orchid, strawberry) under cultivation experiment with the coating materials for plant cultivation of Examples 1 to 4 and Comparative Examples 1 to 5 and evaluating them in three stages.
"There is no legginess or growth delay" is ○, "Some plants have slight growth or growth delay, but there is no problem overall", "There is overall growth or growth delay" Was evaluated as x.
"Presence or absence of high temperature damage" is the result of observing the plants (sweet pea, Phalaenopsis orchid, strawberry) under cultivation experiment with the plant cultivation coating materials of Examples 1 to 4 and Comparative Examples 1 to 5 and evaluating them in three stages. is there.
"No growth failure, leaf burning, leaf fall, withering, disease" ○, "Slight growth failure, leaf burning, leaf fall, withering, disease on some plants, but there is no problem overall" Was evaluated as △, and “overall growth failure, leaf burning, leaf fall, withering, and disease” were evaluated as ×.
"Flower with flowers" is the result of observing flowers (sweet pea, Phalaenopsis orchid) under cultivation experiment with the plant cultivation dressing of Examples 1 to 4 and Comparative Examples 1 to 5 and evaluating them in three stages.
"There is no problem with the condition of flowers and the color of flowers" ○, "There is a slight problem with the condition of flowers and the color of flowers with some flowers, but there is no problem overall" △ , "There is a problem with the overall condition of flowers and the color of flowers" was evaluated as x.
The "yield" is the result of observing the vegetables (strawberry) under cultivation experiment with the coating materials for plant cultivation of Examples 1 to 4 and Comparative Examples 1 to 5 and evaluating them in three stages.
"There is no decrease in yield" is marked with ○, "Some plants have a slight decrease in yield but there is no problem overall", and "There is a decrease in yield overall" is marked with ×. evaluated.
The "comprehensive evaluation" was to evaluate the comprehensive function in three stages from the evaluation results of "growth state", "presence or absence of high temperature damage", "flowering / flower color" or "yield".
“Optimal” was evaluated as ○, “good” was evaluated as △, and “unsuitable” was evaluated as ×.

[Evaluation results]
Comparing Examples 1 to 4 and Comparative Examples 1 to 5, good evaluation results were obtained in all of the growth state, the presence or absence of high temperature damage, flowering / flower color or yield, and comprehensive evaluation. There is.
As is clear from this evaluation result, in Examples 1 to 4, it is possible to prevent the growth of plants and the decrease in photosynthetic rate while suppressing the temperature rise in the greenhouse, and to grow them soundly.
In particular, in Example 3, the light transmittance was optimum and good evaluation results were obtained.
Although the evaluation results of Examples 1, 2 and 4 having higher and lower light transmittances were slightly inferior to those of Example 3, there was no hindrance to the growth of plants and the evaluation results were within the permissible range.
Based on these evaluation results, even if legumes such as sweet pea, which are not good at high temperatures, are cultivated, there is no growth delay or growth delay, no high temperature damage occurs, and there are no problems with flower attachment or color. I found that there wasn't.
Therefore, even sweet pea, which is not good at high temperatures, can grow soundly without causing high temperature damage.

On the other hand, Comparative Examples 1 to 5 have poor evaluation results in any of the growth state, the presence or absence of high temperature damage, flowering / flower color or yield, and comprehensive evaluation.
Explaining in detail, in Comparative Example 1, since the average transmittance measured with ultraviolet rays having a wavelength of 325 nm is 0%, which is less than 20%, the evaluation results are poor in terms of sweet pea and Phalaenopsis orchid with flowers / flower color and strawberry yield. became.
In Comparative Example 2, since the average transmittance measured with visible light having a wavelength of 400 to 700 nm was 70%, which was less than 75%, poor evaluation results were obtained in terms of Phalaenopsis orchid flowering / flower color and strawberry yield.
In Comparative Example 3, since the average transmittance measured with near infrared rays having a wavelength of 800 nm was 60%, which was less than 70%, poor evaluation results were obtained in terms of sweet pea and Phalaenopsis orchid with flowers, flower color, and strawberry yield.
In Comparative Example 4, since the average transmittance measured with near infrared rays having a wavelength of 800 nm was 90%, which was higher than 85%, poor evaluation results were obtained in terms of sweet pea and Phalaenopsis orchid with flowers and flower color, and strawberry yield. ..
In Comparative Example 5, since the light transmittance was too low, the evaluation result was poor except for the presence or absence of high temperature damage.

Claims (3)

A coating material for plant cultivation used in plant cultivation facilities including flowers, with the transparent substrate film molded by the inflation manufacturing method as it is.
The substrate film is an outer layer containing low-density polyethylene as a main component and an intermediate layer containing an ethylene-vinyl acetate copolymer as a main component and containing a temperature rise inhibitor that suppresses the transmission of light in the near-infrared light region. When ethylene - an inner layer consisting mainly of vinyl acetate copolymer, is formed into a three-layer structure of the ethylene in the intermediate layer - other total vinyl acetate copolymer and the Atsushi Nobori agents 100 The ultraviolet region containing 77.25 to 83.35% by weight of the ethylene-vinyl acetate copolymer, 4.00 to 10.00% by weight of the temperature rising inhibitor, and a wavelength of 290 to 400 nm with respect to% by weight. The average transmission rate of light rays of 325 nm is 20 to 45%, the average transmission rate of light rays in the visible light region having a wavelength of 400 to 700 nm is 75 to 85%, and the wavelength is close to 700 to 1200 nm. A coating material for plant cultivation, characterized in that the average transmission rate of 800 nm light among light rays in the infrared light region is 70 to 86%. The coating material for plant cultivation according to claim 1, wherein the substrate film is used in a cultivation facility for flowers of legumes including sweet pea. The coating material for plant cultivation according to claim 1, wherein the substrate film is used in a flower cultivation facility for orchidaceous plants.