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Development of Controlled Releasing Fertilizer
by Using Biodegradable Polymers and Agricultural Waste
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Akira MATSUDA, Osamu YOSHIMURA, Shizuo NAKAMURA, Takayuki TSUKEGI,
Makoto ADACHI, Katsumi MIZUNO, Toshio OGAWA and Satoshi OSAWA
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Most of fertilizers used at present are excellent in immediate effect
because of water solubility, but there is no persistence. Therefore, it
is usually difficult to supply the nutrition for crops with sufficient
quantity and at appropriate time. In this study, the manufacturing method
of fertilizer having the following features was studied; the elution of
component in fertilizer could be controlled widely, the stability was
excellent, and polymers coating fertilizer were biodegradable in the environment
after the use. Consequently, it was found that fertilizer laminated with
biodegradable polymers could control the releasing speed of components
during a fixed period. Moreover, fertilizer could be manufactured more
easily by using extrusion method. This method gave the longer releasing
period of component from the fertilizer than that of laminating method.
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Keywords ■■■ |
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controlled release, biodegradable
polymer, fertilizer |
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