粘土包膜缓释尿素的养分释放特征及其增产效应

以尿素为缓释肥料核心,两种粘土矿物为包膜材料,聚乙烯醇为粘结剂,研制出两种包膜缓释肥料,并探讨了两种包膜肥料在土壤、石英砂等介质条件下的氮素释放特征及形态转化规律,还通过盆栽试验进一步研究了包膜尿素的增产效应。试验结果表明,与普通尿素相比,两种粘土矿物肥料均具有较好的缓释性能,在以石英砂为介质时表现的尤为明显;包膜后的尿素具有较明显的生物增产效应,两种包膜肥料在株高、鲜重、干重等主要产量性状方面与普通尿素均存在显著差异。

Nutrient release characteristics and its increasing effects in yield of slow release fertilizer in different media

The coated-released fertilizers were prepared with two kinds of clay mineral-bentonite and zeolite.The media of soil,sand were used to study the nutrient release characteristics of two types of slow-released fertilizers.Pot experiment was conducted to investigate the effects of clay mineral coated slow release fertilizers on yield and nitrogen recovery in maize.The result showed that the slow-release effect of fertilizer was better than normal fertilizer.The yield increasing effect of coated fertilizer was significant higher than that of height of plant,fresh weight and dry weight of non-coated fertilizer.