PROBLEM TO BE SOLVED: To provide a coated granule for application to a rice nursery box, which exhibits excellent efficacy because, even when it is applied to the box during rice nursery period between seedling and transplanting, it causes suppressed elution or release of an agriculturally active component and therefore does not produce any chemical injury and because it allows enhanced elution or release of the agriculturally active component and intake by rice seedling after the rice seedling is transplanted in a proper field where it needs to exhibit efficacy.SOLUTION: A coated granule for application to a rice nursery box and a method for controlling release of the coated granule are constituted by constitutional requirements characterized by coating granules containing (a) an agriculturally active component having a water solubility of 0.01 g/L or higher at 20°C, (b) lauryl sulfate, (c) an anionic surfactant except lauryl sulfate, (d) orthophosphoric acid, (e) anhydrous sodium sulfate, and (f) a solid carrier with (g) a water-based resin composition prepared by dissolving or dispersing a copolymer of a polymerizable unsaturated monomer having a hydrolyzable silyl group with a polymerizable unsaturated monomer except the polymerizable unsaturated monomer having the hydrolyzable silyl group in water.COPYRIGHT: (C)2010,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粒剤を育苗箱へ処理しても、農薬活性成分の溶出・放出が制御され薬害を生じることがなく、かつ薬効が必要とされる本田移植後に農薬活性成分の溶出・放出が高まり稲体に取り込まれることによって、優れた薬効を発揮するイネ育苗箱施用被覆粒剤を得るにある。【解決手段】a)水に対する溶解度(20℃)が0.01g/L以上である農薬活性成分、b)ラウリル硫酸塩、c)ラウリル硫酸塩を除く陰イオン性界面活性剤、d)オルトリン酸、e)無水芒硝およびf)固体担体を含有した粒状物を、g)加水分解性シリル基を有する重合性不飽和単量体と、当該加水分解性シリル基を有する重合性不飽和単量体を除く重合性不飽和単量体との共重合体を水に溶解または分散させてなる水系樹脂組成物により被覆することを特徴とする、構成要件とでイネ育苗箱施用被覆粒剤および被覆粒剤の放出制御方法を構成している。【選択図】なし
