JPH085976B2 - Agricultural coating material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an agricultural coating material, and more specifically, durability, dust resistance, light transmittance, algae resistance, etc. for spreading in agricultural and horticultural facilities such as tunnels, pipe houses, large-scale houses, etc. The present invention relates to an agricultural coating material composed of a fluorine resin film having excellent properties.

Conventionally, as a coating material for tunnels and pipe houses, polyethylene film, ethylene-vinyl acetate copolymer film, polyester film, vinyl chloride resin film, etc. have been used, but vinyl chloride resin film is workable, priced, and heat-retaining. It occupies the majority in terms of sex. However, since the vinyl chloride resin film contains a plasticizer, the film surface is easily soiled by bleed-out of the plasticizer, and the light transmittance is reduced in a short period of time. Further, each of the above-mentioned films is blended with an ultraviolet absorber for improving weather resistance,
Due to deterioration due to temperature, wind and rain, oxidation, etc., it is usually necessary to replace it within 1 to 2 years. Moreover, since the film containing the ultraviolet absorber as described above shields the ultraviolet light depending on its activity, it is not suitable for the cultivation of crops requiring the ultraviolet light (eg, eggplant, some flowers). Moreover, it is also unsuitable for cultivation of crops (eg, strawberries, melons, watermelons, peppers, etc.) that need to fly honey bees, sand flies, etc. for pollination.

On the other hand, in recent years, full-scale large-scale houses have been adopted for the purpose of labor saving of house management, expansion of cultivation area, and extension of house life. This large-sized house has conventionally been coated with polyester resin plate, polycarbonate resin plate, hard vinyl chloride resin plate, acrylic resin plate, fiber reinforced plastic plate, plate glass, etc. for long-term expansion of 5 years or more. However, since these coating materials have a large thickness, they must be spread by using a large-sized dedicated base material, which has the drawback that the workability is very complicated and relatively expensive. Further, polyester resin plate, polycarbonate resin plate, hard vinyl chloride resin plate, acrylic resin plate and the like have drawbacks such that cracks are likely to occur due to hail and the cracks are easily propagated. Moreover, since these plastic boards are generally blended with an ultraviolet absorber for improving weather resistance, crops such as eggplant and flowers that require ultraviolet light, or crops that require mating with insects such as melon and strawberry. Is not suitable for cultivation. Further, the plate glass is dangerous when it is broken, and it is necessary to make the skeleton of the house stronger because it is heavier than the plastic plate.

Therefore, recently, from the aspects of economic efficiency, labor saving, diversification of demand, etc., it has excellent durability, dust resistance, light transmittance, etc., and can be extended for a long period of time, and it can be applied to various crops without any restrictions. There is a strong demand for the development of a covering material that can be used universally and is easy to install even for a large-scale full-scale house and can be attached at a relatively low cost.

As a result of studying various synthetic resin materials in order to meet such demands, the present inventors have found that fluororesin has a conventional agricultural coating in all aspects such as weather resistance, mechanical strength, flexibility, and light transmittance. It has excellent properties compared to the synthetic resin used as a material, and the film made from fluorine resin has excellent weather resistance even if it does not contain an ultraviolet absorber for improving weather resistance. It has high mechanical strength and flexibility, is strong against wind and rain and hail, has high resistance to temperature changes and oxidation, and can be extended for a long period of time. It is transparent and can be easily spread to large houses, not to mention tunnels and pipe houses, and it is not limited to a wide variety of crops that could not be used due to color and pollination. See what can be used for It has led to the completion of the out of the present invention.

Therefore, according to the present invention, there is provided an agricultural coating material comprising a fluororesin film.

The fluorine resin used for the agricultural coating material of the present invention is
This is a general term for synthetic resins obtained by polymerization of olefin containing fluorine. In the present invention, those having a fluorine content of 45% by weight or more, particularly 50% by weight or more are preferably used. Examples of such fluorine resin include ethylene-tetrafluoroethylene-based copolymer, ethylene-
Chlorotrifluoroethylene-based copolymers, hexafluoropropylene-tetrafluoroethylene-based copolymers, perfluoroalkyl vinyl ether-tetrafluoroethylene-based copolymers, polyvinylidene fluoride, polyvinyl fluoride, etc., and the like in the present invention. Any of these can be used, but among them, an ethylene-tetrafluoroethylene-based copolymer is preferable.

 The ethylene-tetrafluoroethylene-based copolymer is
Mainly composed of ethylene and tetrafluoroethylene (ethylene
The molar ratio of ethylene / tetrafluoroethylene is generally 40/60 to 6
0/40) and, if needed, a small amount (usually 10
A third comonomer component of less than mol%) was copolymerized
Therefore, in the present invention, in particular ethylene / tetrafluoro
Ethylene content molar ratio 40/60 ~ 60/40, preferably 45/5
Within the range of 5 to 55/45, and with the formula CH₂= CH-CnF_{2n + 1}(This
Where n is an integer of 2 to 10)
Lower alkyl vinyl monomer units (eg CH₂= CH-C_FourH
₉Or CH₂= CH-C₆H₁₃(Unit derived from)
Within the range of 0.1 to 10 mol%, preferably 0.3 to 5 mol%
Some ethylene-tetrafluoroethylene copolymers are preferred
Properly used. This ethylene-tetrafluoroethylene
The copolymers are known per se, for example,
It can be manufactured by the method described in JP 59-50163.
As a commercial item, Asahi Glass Co., Ltd.
Use what is marketed under the trade name "COP"
You can also

The film formation from the fluororesin described above can be carried out by a method known per se, for example, an extrusion molding method, an inflation molding method or the like. At the time of film forming, a colorant (for example, titanium oxide, zinc oxide, calcium carbonate, precipitable silica, carbon black, chrome yellow, phthalocyanine blue, phthalocyanine green, etc.) can be added to the fluorine resin, if necessary. . Furthermore, since the inside of an agricultural house is generally hot and humid, and condensed water droplets tend to adhere to the inside of ceilings and walls, it is preferable to treat at least the inside surface of the film with a drip-free agent. Examples of the non-drip agent that can be used include a hydrophilic polymer, a surfactant, or a mixture of a hydrophilic polymer and a surfactant. As a hydrophilic polymer,
In addition to polyvinyl alcohol, -SO ₄ , -SO ₃ H, -COO
_{H, -NH 2, -CN, -} (OCH 2 CH 2) a polymer having a generally hydrophilic functional groups, such as are included, also anionic as surfactant, cationic, any type of nonionic It may be the one.

If the film is too thin, it will be easy to tear.
On the contrary, if it is too thick, not only is it uneconomical, but it may be inconvenient for film work and subsequent handling (cutting, bonding, spreading work, etc.), and the light transmittance may decrease, so it is generally 10- Conveniently, it is in the range of 300μ, preferably 20-200μ.

The fluororesin film provided by the present invention is used as a covering material for agriculture, in the same way as a usual covering material for agriculture, for facility cultivation of crops, not to mention tunnels and pipe houses, as well as full-scale large houses. Can be expanded.

Therefore, the agricultural coating material comprising the fluororesin film provided by the present invention has various remarkable effects not found in the conventional agricultural coating materials as described below. Especially, it is extremely large that it contributes to the field of facility agriculture and horticulture.

(1) The agricultural coating material of the present invention has much better weather resistance than conventional synthetic resin agricultural coating materials, is durable, and can withstand a long-term extension of 5 years or more. You can Therefore, it is possible to significantly reduce the time and effort for replacement and it is economical.

(2) The agricultural coating material of the present invention is rich in flexibility without using a plasticizer and has no tackiness, and therefore has very little adhesion of dust or dust (excellent dustproofness). Therefore, even if the film is stretched for a long period of time, the light transmittance of the film is hardly reduced, and the film can be used for a long period of time.

(3) The agricultural coating material of the present invention has a large mechanical strength, is highly flexible and elastic, and can withstand wind and rain and hail outdoors, even though it is a relatively thin film. It can also be used in a large modern house. Moreover, since the agricultural coating material of the present invention is in the form of a flexible film as described above, when it is spread on a full-scale large-scale house, it is specially used like when attaching a synthetic resin plate or a glass plate which has been conventionally used. It does not require any members, and can be easily attached with inexpensive equipment such as springs and vinyl pets.
Very good workability.

(4) The agricultural coating material of the present invention has a great advantage that no algae are attached or propagated, which is quite surprising.

Generally, the inside of a tunnel or a house is hot and humid, and the condition is that microorganisms and plants are naturally prone to breed. Algae are no exception, and in the tunnels and houses where the film is stretched, a phenomenon in which algae often propagate from the part of the film that touches the ground inside is often seen. If the algae are left to grow as they are, they grow steadily upward along the inner surface of the film, significantly obstructing the light transmission of the film, and damaging the growth of crops in tunnels and greenhouses. Algae are microscopic-sized organisms that live in surface water, have chlorophyll, have photosynthetic ability, and are often covered with adhesive substances.
Algae adhered to the film are difficult to physically scrape.

Conventionally, there is no choice but to discard the algae-generated film or wait for it to dry and peel off naturally, and it is difficult to do so even in a large house, so develop algae control measures. Was strongly desired.

However, it has been found that the agricultural covering material of the present invention does not cause algae to adhere or reproduce even when it is spread over a long period of time, and is particularly suitable for a large-scale house.

(5) Furthermore, the agricultural coating material of the present invention is extremely excellent in weather resistance even without using an ultraviolet absorber as a weather resistance improver, and not only in the visible light part but also in the ultraviolet and infrared parts. Since sunlight also transmits well, it is possible to use it for crops that have been limited in cultivation in facility cultivation such as conventional tunnels and houses by using the agricultural coating material of the present invention. You can

For example, when eggplants are cultivated under the covering of an agricultural coating material that shields ultraviolet rays, the eggplant fruit yield, fruit size, etc. are good, but the fruit color becomes pale (the eggplant color becomes lighter), Although there is no commercial value as a poorly colored fruit, when the eggplant is cultivated under the coating of the agricultural coating material of the present invention, the above-mentioned drawbacks are completely eliminated, and the eggplant having the same fruit color as the fruit of the eggplant harvested by open field cultivation is obtained. Fruits can be harvested, and the amount of fruits harvested and the size of fruits are improved.

Further, flowering plants such as gentian, peony, riatris, kyoto, and statice have a tendency that, when cultivated under the coating of a UV-shielding agricultural covering material, flower growth is good but flower color becomes pale and commercial value decreases. However, when the flowers are cultivated under the coating of the agricultural coating material of the present invention, it is possible to harvest flowers having the same flower color as the flower color obtained by open field cultivation.

Furthermore, when it is necessary to fly honeybees, honeybees and the like for pollination, strawberries, melons, watermelons, cultivated pollinating fruit-bearing plants such as bell peppers under the coating of the above-mentioned ultraviolet-shielding agricultural coating material, the fruit set rate is insufficient and , Occurrence of malformed fruits, etc., is not suitable for cultivation of the plant, but when the plant is cultivated under the covering of the agricultural coating material of the present invention, the fruit setting rate of the fruit is improved, There are advantages such as the occurrence of malformed fruits is reduced and the yield of fruits and the size of fruits are improved. The "pollinating fruit-bearing plant" refers to a flower-visiting insect, for example, a plant cultivated using a bee as a pollination medium, and includes, for example, melons such as melon, miscellaneous melons, squirrels, cucumbers, watermelons, and melons of the melon family; Solanum plants such as cabochia; Rosaceae plants such as strawberries;
A rose family plant such as cherries, peaches, apples, pears, loquats; a vine family plant represented by grapes; a citrus family plant such as Unshiu mandarin orange, navel, Iyokan, etc. are included, and the covering material for agriculture of the present invention is included. Particularly preferably used plants are Cucurbitaceae plants, Solanaceae plants, Rosaceae plants,
Among them are melon, miscellaneous melon, prince melon, watermelon, pumpkin and strawberry.

Hereinafter, the present invention will be described more specifically with reference to Examples and Reference Examples.

Example 1 An autoclave having an internal volume of 10 was charged with 3.46 kg of trichloromonofluoromethane and 6.52 of trichlorotrifluoroethane.
kg, and 2.38 g of t-butyl peroxyisobutyrate were charged, and then 1226 g of futrafluoroethylene, 82 g of ethylene, and perfluorobutyl ethylene (CH ₂ ═CH—C ₄
F ₉ ) Charge 26g. While sufficiently stirring this mixture, the reaction temperature is protected at 65 ° C. to carry out the copolymerization reaction. During the progress of the copolymerization reaction, the molar ratio of tetrafluoroethylene / ethylene / perfluorobutylethylene was 53 / 46.3 / 0.7.
Is introduced and the polymerization pressure is maintained at 15.0 kg / cm ² . After 5 hours, 460 g of a white copolymer was obtained. The copolymer has a molar ratio of C ₂ F ₄ / C ₂ H ₄ / CH ₂ = CHC ₄ F ₉ of 53 / 46.3 /
0.7, flow start temperature 267 ℃, thermal decomposition start temperature 360 ℃
It was.

The ethylene-tetrafluoroethylene copolymer (hereinafter sometimes abbreviated as “ETFE”) obtained above was extruded at a resin temperature of 320 ° C. to produce a film having a thickness of 60 μm. The obtained film was used as coating material No. 1 and subjected to various tests, and the results are summarized in Table 1 below.

Comparative Examples 1 to 4 Six Light Three Nine (Teijin Co., Ltd. polyester super durable agricultural hard film) was used as the coating material No. 2 (Comparative Example 1), and a bonset (Two axis for cultivation of tomato and cucumber manufactured by CI Kasei Co., Ltd.) Stretching (hard agricultural film, thickness 0.1mm) was used as coating material No. 3 (Comparative Example 2), and Murasaki Ace (Mitsubishi Kasei Vinyl Co., Ltd. light selective hard agricultural bifilm for leek / fluff, thickness 0.1mm) coating material No. 4 (Comparative Example 3), Nobiace (Mitsubishi Kasei Vinyl Co., Ltd. general agricultural film, thickness 0.1 mm) was used as the covering material No. 5 (Comparative Example 4), and various tests were carried out in the same manner as in Example 1. The results are summarized in Table 1 below.

The wavelength-dependent light transmission curves of the above coating materials No. 1 to No. 5 are shown in the attached FIG.

Examples 2 to 5 NEOFLON FEP film NF-0050 (hexafluoropropylene-tetrafluoroethylene copolymer film manufactured by Daikin Industries, thickness 0.05 mm) was used as coating material No. 6 (Example 2), and NEOFLON PFA film AF- was used. [0050] The coating material No. 7 (Example 3) was made of Daikin Kogyo Co., Ltd. (perfluoroalkyl vinyl ether tetrafluoroethylene-based copolymer film, thickness 0.05 mm), and Kainer FH ₂ (Mitsubishi Petrochemical polyvinylidene film, thickness 0.05) was used. mm) coating material N
o.8 (Example 4), Tedlar 200SG40TR (Polyvinyl fluoride film made by Dyupon Co., thickness 0.05mm) is used as the coating material N
O.9 (Example 5), various tests were carried out in the same manner as in Example 1, and the results are shown in Table 1 below.

The various test methods and evaluation methods carried out in the examples and comparative examples are as follows.

(1) Evaluation of weather resistance The coating material (film) was exposed on an outdoor exposure table facing the south side of the growth and inclined at 45 ° to the flat surface, and a part of each was taken at the time when a predetermined period of time passed. Evaluate the appearance of the soybean paste and the film, and the residual rate of elongation at break.

[Evaluation Criteria] 5: No change in appearance and residual elongation of 80% or more 4 ... No change in external appearance, residual elongation of 60% to less than 80% 3 ... Appearance changes such as discoloration are observed, and the residual elongation rate is in the range of 40% to less than 60% 2. The appearance change such as discoloration is observed on the entire surface and the residual elongation rate is 20% to less than 40%. Items within the range 1 ... Discoloration and other changes in appearance are observed, and residual elongation is less than 20% Tear strength Each film removed from the exposure table above was torn using an Elemendorf tear tester. Is measured and the residual ratio of tear strength is evaluated.

[Evaluation Criteria] 5: Residual tear strength of 80% or more 4 ... 〃 60 or more and less than 80% 3 ・ ・ ・ 〃 40 or more and less than 60% 2 ... 〃 20 to 40% in range 1 ・ ・ ・ 〃 less than 20% Impact strength Measure the impact strength of each film out of the exposure table with an impact tester. , Evaluate its residual rate.

[Evaluation Criteria] 5: Residual impact strength of 80% or more 4: 〃 60 or more to less than 80% 3 ・ ・ ・ 〃 40 or more to less than 60% 2… 〃 20 to 40% less than 1 〃 less than 20% (2) Dust-proof evaluation Each coating removed from the exposure table for the evaluation of (1) above. The light transmittance of the film was measured at a wavelength of 550 nm. The higher the value of the excess rate, the better the dust resistance.

(3) House aggregate that fixes the film of agricultural coating material to the house when the film is spread on the house (generally called “Vinipet”, the film is sandwiched between concave house aggregate and pressing spring metal fittings to be fixed) House material) to evaluate the difficulty of construction when the film is spread.

[Evaluation Criteria] 5 ... Construction is as easy as general agriculture vinyl chloride film.

4 ... Slightly more difficult to construct than general agricultural products.

3 ... Construction is possible, but wrinkles are prone to occur.

1 ... The film cannot be fixed and construction is impossible.

(4) Dripping property A coating type drip agent is applied to the inside of the film and this is applied at 40 ° C.
Is coated on a beaker containing warm water, and is kept as it is for 2 months, and the retention property of drip property for 2 months is observed.

[Evaluation Criteria] 5: Anti-fogging deteriorated area is less than 10% and completely maintains the flowability 4: 〃 10 or more and less than 30% 3 〃 30 Those in the range of ≥50% and less than 2% 〃 Those in the range of ≥50% and less than 70% 1 ・ ・ ・ 〃No more than 70% and no drip (5) Hail resistance ( The film is exposed to the outdoor exposure table installed in the same manner as in 1), and the appearance of the film after the hail with a diameter of 5 to 7 mm has fallen for 10 minutes is evaluated.

[Evaluation Criteria] 5: No perforation or tearing occurred.

3: There are traces of holes and tears.

1 ... Perforated and cracked.

(6) Algae-proofing Agricultural greenhouses are covered with agricultural coating materials,
Cultivated two crops of tomato (January 1985 to April 1987)
Then, observe the algae generation and adhesion status on the side and wife of the house.

[Evaluation criteria] 5: No adhesion of algae.

3 ... Some algae adhered.

1 ... A lot of algae adheres and the material is opaque.

Reference Example 1 and Control Examples 1 to 4 (Strawberry cultivation experiment) A parent strain of strawberry (cultivar Takako fast growing) that has been harvested in early November is cultivated in a greenhouse, and this strain is planted in the open field in late August of the following year. When cultivating was continued, runners appeared, so I temporarily planted it in a 12 cm pot in mid-July. On the other hand, ridges (ridge width 1 m 40 cm, ridge height 20 cm, passage 70 cm) were made in 4 pipe houses of 240 tsubo (frontage 5.3 m, ceiling height 2.6 m, length 150 m) and cultivated according to the conventional method. went.

On September 20, each pipe house was coated with the coating material No. 1 prepared in Example 1 and the coating materials No. 2 to No. 5 of Comparative Examples 1 to 4. The film coating method for each house was as follows.

That is, coating material No. 1 for house A, coating material No. 2 for house B, coating material No. 3 for house C, coating material No. 4 for house D, and coating material for house E. The entire house was coated in the same manner as material No. 5 in general.

The ridges in the house were covered with a commercially available polyethylene black multi-film (trade name “Oikaka Multi”, thickness 20μ, manufactured by Mitsubishi Yuka).

At the same time, tentatively planted strawberry seedlings were planted at 40 plants / tsubo.

A film made of ethylene / vinyl acetate copolymer (trade name "Mitsubishi Yukano Sakubi" thickness 30μ for heat insulation on November 15th)
It was lined with (Mitsubishi Yuka) and cultivation was continued. Winter temperatures were around 5C (night) and 22-23C (day).

Harvesting began in early January of the following year and continued until mid-May.

 Irrigation was performed once a week in principle.

At the time of pollination, bee boxes were set in houses A, B, C, D, and E.

Table 2 shows the results of the selection of 20 shares for each house and the following method (survey period January 15 to February 14).

Furthermore, using the same house, strawberry cultivation in the second year, 3
It is implemented in the first year and the yield (commodity fruit yield index) is displayed.
It is shown in FIG. When the house covering was damaged by wind, hail, etc., the same covering was repaired and cultivation was continued.

In addition, when the strawberry cultivation in the first year was completed, the adhesion state of algae was investigated. House A (Reference Example 1) had no algae adhered at all, but Houses B, C, D and E (Control Examples 1, 2, 3 and 4) had a lot of algae adhered to the side part and the wife part. I was seen.

Survey method (1) Number of flying bees: A box of bees (about 10,000) was set at a distance of about 1 m from the entrance of the house, and the house exit was twice a day and twice a day on the third day after the set. The number of bees flying and active in the house was observed with the naked eye.

(2) Flight status of bees: When the measurement of (1) is performed, the activity of the bees is observed with the naked eye.

(3) Malformed fruit ratio (%) The ratio (number) of malformed fruits in the total harvested fruits.

(4) Yield (commodity fruit yield index): Yield index when the product fruit yield in the first year of Reference Example 1 is 100.

Reference example 2 and control examples 5 to 7 (melon cultivation experiment) On July 25, one seed of melon for rootstock (seedling seed Emerald Zem) was sown in the center of the pot, and the next day, melon for scion was prepared. Seeds (Variety Sunday melon) are sown in the same pot, and after the seeding is completed, a tunnel is made with ginseng to protect against oilworms and give sufficient water. Sunday melon sprouted on July 29,
The next day, the cotyledons develop and on August 1, the fungicide Totopudin M (manufactured by Nippon Soda) is diluted 1500 times and sprayed. On the 2nd of August, when the number of leaves of the emerald Zem for the rootstock reaches 0.7, the Sunday melon for the scion is called and grafted. On the day of grafting, 8 pieces of sardines were layered on the same day to block light, and the next day was set to 1 piece, which was then grown with sufficient sunlight, the roots of the cuttings were cut on August 12, and the next day, the fungicide Mannebu Daisen M (active ingredients Manganese, ethylene, Biscithio, carbamate: Tokyo Organic Chemical Industry Co., Ltd.) is diluted 600 times to grow seedlings with 1 or 2 true leaves. During the seedling raising period, water is given in the morning to the extent that it dries in the evening.

Pipe Houses F, G, H and I (240 tsubo: opening
5.3m, depth 150m, height 2.6m, ridges (height 30cm, width 70c)
m, ridge 60 cm) and compound fertilizer Kanematsu 495 (sold by Kanematsu Corporation) as the basic fertilizer for 120 kg / 10 are, and the surface of the ridge is black multi-film (black polyethylene film: thickness 30).
μ) and cover 1 to 2 melon seedlings above
Planted so that there would be 1500 trees per 10 ares. The coating of each coating material of the pipe house was performed one week before planting.

The coating of the coating material on each house was performed as follows. House F
No. 1 was coated with the coating material, and Houses G, H and I were coated with the coating materials No. 2, No. 3 and No. 4, respectively.

Mid-August Spray the germicidal material Maneb Taisen M, and when the number of true leaves reaches 5-6, attract with tape and make three-dimensional cultivation.
In the end of the month, when the true leaves grew to 20 to 22 leaves, the drop core was added. Since female and male flowers bloom at this time, the bee box was crossed with the bees set in House F. The melon settled within a few days after mating. If it grows to the egg size of this fruit, 45-50 from the ground
Drop one cm-sized fruit and drop the remaining fruit. In early September, the fungicide Mannebutaisen M was sprayed, and a net was generated on the fruit's epidermis.
Mid-September The epidermis had grown to a net of 8 minutes, so remove the bag and wipe it with a ball. After that, manage to keep it in good sunlight, and
Late month Spray the fungicide Mannebutaisen M. The fruit setting rate of melon in the middle of August was investigated, and the result is shown in Table-3.

Furthermore, using the same house, melon cultivation in the second year,
Conducted in the 3rd year, investigated the fruit set rate, and tabulated the results.
3 shows.

At the same time, the yield was also investigated. House F (Reference Example 2)
The harvest amount was almost the same as in the second and third years, but in House I (Reference Comparative Example 7), the harvest amount was halved in the second year as compared with the first year.

In addition, when the state of adhesion of algae was investigated at the time when the melon cultivation in the first year was completed, House F (Reference Example 2) showed no adhesion of algae, but Houses G, H and I (Control Example 5, In 6 and 7), a lot of algae was seen to be attached to the side and the end of the house.

Survey method (1) Number of flying bees: A box of bees (about 10,000) was set at a distance of about 1 m from the entrance of the house, and the house exit was twice a day and twice a day on the third day after the set. The number of bees flying and active in the house was observed with the naked eye.

(2) Flight status of bees: When the measurement in (1) above is performed, the activity of the bees is observed with the naked eye.

(3) Fruit setting rate (%): The rate of fruit setting at the 9th to 12th nodes (average of 50 trees).

Reference Example-3 and Control Examples 8 to 10 (cultivation of eggplants) Eggplant (variety of 1,000 varieties) 53 days after planting the eggplant seedlings (two true leaves) for planting 53 kg / 10a
House A (Reference Example-3), House B, House C, and House D (Comparative Examples 8 to 10) fertilized in No. 1 with a ridge width of 1.2 m and an inter-plant 40-
45cm, 1 row planted, 2000 plants per 10a planted in the middle of March.

House heat insulation target is 26 to 30 ° C during the day and 12 to 15 ° C at night. Pest removal is totopudine
Disperse 500 to 1000 times the solution to control.

The eggplant fruits can be harvested about 40 days after planting, and the state of the eggplant fruits harvested 60 days after planting is shown in Table-4.

Reference Example 4 and Control Examples 11 to 13 (Cultivation of gentian) The gentian strains were dug so as not to root them on the day following early spring weather, the soil that fell easily was dropped, and the gentian was wrapped in sawdust and 0 ° ~- Store at 2 ° C as target.

In the middle of October, House A (Reference Example 4) and House B,
Plant in C and D (control examples 11 to 13). The floor is fully watered and controlled at 15 ° C or below, fertilizer application is 100 kg of fertilizer per 1a, and 1 kg / a of nitrogen, phosphoric acid, and potassium are applied respectively, and the floor width is 90 to 100 m. It is planted with a distance between plants of 10 cm.
It is cultivated so as to be sufficiently flooded (inhibited cultivation of gentian) and harvested as cut flowers in the middle of February. The condition of flower color is shown in Table-5.

Reference Example 5 and Control Examples 14 to 16 (cultivation of Kikiyo) Kikiyo was housed in House A (Reference Example 5) and House B,
C and D (control examples 14 to 16) are planted in mid-September, and suppressed and cultivated by a conventional method. Table-6 shows the results of an investigation of the flower color status after harvesting cut flowers of Kikiyou at the end of December.

[Brief description of drawings]

FIG. 1 shows coating materials No. 1 and No. used in Examples and Comparative Examples.
It is a figure of the light transmission curve according to wavelength of No. 2, No. 3, No. 4, and No. 5.

Claims (1)

[Claims] 1. The ethylene / tetrafluoroethylene content molar ratio is in the range of 45/55 to 55/45, and the formula CH ₂ ═CH.
-C _n F _{2n + 1} (wherein, n represents an integer of 2 to 10) ethylene is in the range content of perfluoroalkyl vinyl monomer units is 0.1 to 10 mol% represented by - tetrafluoroethylene An agricultural coating material characterized by comprising a copolymer film.