JPS5929555B2 - fertilizer composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fertilizer composition comprising a fertilizer or a fertilizing substance and pullulan or a derivative thereof, which has excellent processability and strength. It provides a fertilizer that can be applied to trees to increase their vitality and promote healthy growth.

Conventionally, several methods have been proposed for using thermoplastic resins, thermosetting resins, paraffin, pitch, nitrate lime, etc. as binders for fertilizers.

However, many of these substances have weak binding properties and poor processability.

As a result of research, the present inventors have found that by pre-mixing pullulan or its derivatives with fertilizer, etc., and then molding and solidifying it using a commonly used molding method under normal pressure or pressure, it is possible to form granular or other arbitrary shapes. The present invention was achieved by discovering that it is possible to produce a molded fertilizer having the following properties.

That is, for example, when manufacturing a fertilizer molded article by the commonly used pressure molding method, if pullulan or its derivatives of the present invention are used, water can be used as a plasticizer, making molding extremely easy, and reducing the amount of material in the molded article. After the fertilizer has leached out, pullulan and the like completely disappear as they are decomposed by water or microorganisms in the soil, and do not inhibit plant growth, making them extremely effective compared to conventional binders.

Further, the fertilizer molded product obtained by pressure molding and solidifying the composition of the present invention is extremely strong.

Furthermore, if pullulan is modified to the extent that it maintains water solubility, the elution of fertilizer components can be controlled, which is effective in increasing the effectiveness of the fertilizer and saving labor in fertilization.

The composition of the present invention can be easily manufactured in a shape that is easy to bury in the soil, so that the fertilizing effect of phosphoric acid, which is easily fixed on the soil surface in normal surface fertilization, is extremely effective, and the fertilization effort is reduced. It also helps save labor.

The method for producing the molded fertilizer of the present invention is not particularly limited, although commonly used granulation methods, pressure molding solidification methods, etc. are effective.

The fertilizer substance in the composition of the present invention may be an organic or inorganic fertilizing substance in addition to commonly used single-component fertilizers and multi-component fertilizers, and may of course be a mixture of fertilizers and fertilizing substances.

Examples of fertilizing substances include oil cake, peat moss, and compost.

In addition, these fertilizers or fertilizing substances may also contain soil conditioners, agricultural chemicals, plant hormones, and the like.

In the present invention, pullulan is a linear polymer in which maltotriose, which is a trimer of glucose, is repeatedly bonded by α-1 and 6 bonds, which are different from the trimer. , has the following molecular structure.

(In the formula, n is an integer indicating the degree of polymerization.

) This pullulan is easily soluble in cold water, but it is known that if it is modified by etherification, esterification, or graft polymerization of a vinyl compound, its solubility in water can be changed depending on the degree of modification.

Acetylated pullulan is used as the pullulan derivative in the present invention.

Although there are no particular restrictions on the method for producing pullulan used in the present invention, it can be isolated and collected as an extracellular mucilage by culturing a strain of the genus Pullularia, which is currently a deuteromylococci.

In other words, the bacterial strain used was Plullaria pullulans.
% starch syrup, 0.5% 2HPO4, 0.1% NaC
1,0,02% MgSO47H20,0,06% (
It can be inoculated into a medium containing 0.04% yeast extract containing NI(4)2SO and cultured with shaking at 24°C for 5 days, or it can be obtained as extracellular mucilage by culturing using glucose as a carbon source.

If necessary, bacterial cells are removed from the culture solution by centrifugation, followed by precipitation with methanol and separation to obtain purified pullulan.

Although the physical properties of pullulan vary depending on the type of strain in which it is produced, any of them can be used in the present invention.

The molecular weight of pullulan used in the present invention is not particularly limited.

The appropriate amount of pullulan or its derivatives to be added is 0.01 to 30 parts by weight per 100 parts by weight of fertilizer or fertilizing substance, and even if the mixing amount is increased beyond this, the strength of the fertilizer molded product will not be significantly improved. Instead, it simply leads to higher costs.

Further, a suitable plasticizer may be added as necessary.

Suitable plasticizers include water and polyhydric alcohols such as glycerin, ethylene glycol and propylene glycol, amides such as formamide and dimethylformamide, diethylenetriamine, triethylenetetramine,
Examples include amines such as ethanolamine and propylamine, and dimethyl sulfoxide.

These plasticizers may be used alone or in combination of two or more.

Pullulan or a derivative thereof, which is a feature of the present invention, is useful as a binder when manufacturing fertilizer molded articles with arbitrary shapes, and is useful for improving moldability by plasticizing fertilizer, and can also adjust the dissolution rate of fertilizer components. It is also effective in increasing fertilizer effectiveness, preventing fertilizer burning, and saving labor in fertilizing.

For example, it is necessary to dig a fertilization hole in order to apply a ring-shaped molded material containing fertilizer ingredients to the lower layer of the soil, but this fertilization hole is useful as a hole for daily irrigation and oxygen supply to plant roots. This also provides favorable conditions for plant growth.

Further, as an example of using the fertilizer component in sheet form, it is extremely effective to use it for seedling cultivation, which has recently become popular.

That is, fertilizer can be applied to any depth in the soil and under certain conditions, resulting in uniform growth of plants.

By applying the fertilizer molded product made from the composition of the present invention, it is extremely efficient and economical, as it improves the fertilizing effect and prevents burning of manure compared to ordinary granular fertilizers.

The present invention will be explained in more detail with reference to Examples below, but the content of the present invention is not limited thereto.

Examples and Comparative Example Fertilizers include Sulfuric Ken'an Fertilizer (Daikokuji Chemical Fertilizer manufactured by Sumitomo Chemical,
N=14%, P2O5=8%, K2O-12%) 40M
', and added 40% each of the binders shown in Table 1 to it.
2 and an additional 42 g of water, and the three ingredients were thoroughly mixed in advance using a Henschel mixer, then filled into a cylindrical mold with a diameter of 30 mm and a length of 15 mm, heated at 80°C, and weighed 100 kg.
Hot pressing was performed for 10 minutes under a pressure of /cr7L.

After that, it was taken out from the formwork and had a diameter of 28mrft and a length of 14m.
A fertilizer molded product in the shape of a ring of m was obtained.

The results obtained are shown in Table 1.

Claims (1)

[Claims] 1. A fertilizer composition obtained by mixing pullulan or acetylated pullulan with a fertilizer or fertilizer substance and solidifying the mixture.