PROBLEM TO BE SOLVED: To provide a coated granular substance applied to a rice-seedling raising box which does not cause chemical poisoning to a seedling and is medicinal sufficiently after transplanting to a rice field even though the coated granular substance is treated to a seedling raising box during a rice-seedling raising period from seeding time to transplanting time.SOLUTION: In the coated granular substance applied to the rice-seedling raising box, the surface of a granular composition using an agricultural-chemical active component, a lignin sulfonic acid salt, Glaubers salt anhydride and a solid carrier is coated with a liquid made by mixing a water-based synthetic resin emulsion and polyvinyl alcohol aqueous solution. The coated granular substance has an excellent effluent control effect that a point of inflection is obtained in a chemical effluent property brought from the coated granular substance by the multiplier effect of two functions. One function is that the coated-film moisture permeability is increased by the fact that polyvinyl alcohol in the coated film is gradually dissolved and the other function is that the Glaubers salt anhydride and the lignin sulfonic acid salt promote decay of the granular composition by the water of gradually passing through the coated film.COPYRIGHT: (C)2011,JPO&INPIT【課題】本発明は、播種時から移植時までのイネ育苗期間に育苗箱へ処理しても幼苗に薬害を生じることがなく、かつ本田移植後は十分な薬効を示すイネ育苗箱施用被覆粒状物を提供することを目的としている。【解決手段】農薬活性成分、リグニンスルホン酸塩、無水芒硝および固体担体を用いた粒状組成物の表面を、水系合成樹脂エマルジョン、ポリビニルアルコール水溶液を混合した液で被覆したイネ育苗箱施用被覆粒状物は、被覆膜中のポリビニルアルコールが徐々に溶解することによって引き起こされる被覆膜透湿性の増大、および該被覆膜を徐々に透過した水分により無水芒硝とリグニンスルホン酸塩が粒状組成物の崩壊を促進するという2つの機能による相乗効果から、被覆粒状物からの薬剤溶出性に変曲点が得られるという優れた溶出制御効果があることを見出した。【選択図】なし
