包膜及其与生化抑制剂结合型尿素在草甸棕壤中尿素态氮溶出特征

在室内恒温培养条件下，以日本70 d聚烯烃包膜尿素和大颗粒尿素为对照，研究4种丙烯酸树脂（MMA）包膜及其与生化抑制剂结合尿素肥料在土壤中尿素态氮溶出与水解特征，以确定不同种MMA包膜尿素在土壤中缓/控释效果与尿素转化机理。结果表明，4种MMA包膜尿素在土壤中尿素累积溶出量在48 d后达到最大值，接近100%，尿素态氮累积溶出80％的时间分别在第24和28 d，时段平均溶出率最高峰值均出现在9～12 d，为7.73%/d～8.04%/d。4种MMA包膜肥料尿素态氮在土壤中累积残留量高峰值分别出现在20和24 d。MMA膜和NBPT共同作用对抑制尿素释放作用效果十分显著， 其结合型肥料对抑制尿素释放作用最强。

Nitrogen release characteristics of coated urea amended with biological inhibitors in meadow brown soil

Using a coated urea(Polyolefin-coated urea,70 day,POCU) made in Japan and a conventional granular urea as check,nitrogen release characteristics of four kinds urea amended with biological inhibitor and coated or coated by acrylic resin fertilizers in Meadow Brown Soil are examined under constant temperature incubating in laboratory.The result indicate that the maximum accumulative urea nitrogen released rate for four acrylic resin coated urea fertilizers was all observed after 48th day,up to 100% urea-N.The...