A granular fertilizer with a coating which is decomposable by soil microorganisms, preferably a coating which is decomposed and degraded both on the surface layer of the soil and in the soil, and a process for producing the granular fertilizer , which coating contains a poly 3-hydroxy-3-alkylpropionic acid as an indispensable ingredient, and if necessary, a resin or a low-molecular resin and further, if necessary, an inorganic or organic powder, and which process comprises adding an organic solvent solution of the poly 3-hydroxy-3-alkylpropionic acid, and if necessary, the resin, and if necessary the powder (dispersed in the solution) to a granular fertilizer in fluided state in the form of spray, and when added, blowing a high speed hot air stream onto the fertilizer to thereby instantaneously remove the solvent and also dry the resulting fertilizer.
一种具有可被土壤微
生物分解的涂层的颗粒肥料,最好是一种在土壤表层和土壤中均可被分解和降解的涂层,以及一种生产该颗粒肥料的工艺,该涂层含有一种聚3-羟基-3-烷基
丙酸作为不可缺少的成分,必要时还含有一种
树脂或低分子
树脂,必要时还含有一种无机或有机粉末,该工艺包括加入聚3-羟基-3-烷基
丙酸的有机溶剂溶液,必要时加入
树脂,必要时加入粉末(分散在土壤中)、无机或有机粉末,该工艺包括将聚 3-羟基-3-烷基
丙酸的有机溶剂溶液,必要时
树脂,必要时粉末(分散在溶液中),以喷雾形式加入到流化状态的粒状肥料中,加入后,向肥料吹入高速热气流,从而瞬间除去溶剂,同时干燥得到的肥料。