棕壤地区玉米和水稻施用聚合物包膜尿素效应初报

通过一年田间小区试验,研究了棕壤地区施用MEISTER热塑性树脂包膜尿素对玉米和水稻生物性状、产量以及田间土壤NH+4-N和NO-3-N一直保4-N和NO-3-N的影响。结果表明,施用MEISTER包膜尿素能使土壤NH+持在较高水平,并且使玉米和水稻产量分别增加了5.1%和15.1%。当MEISTER包膜尿素施用量减少20%时,玉米和水稻产量与尿素追施处理相当,但玉米根和叶中氮的含量以及水稻秸杆和根中氮含量明显降低。MEISTER包膜尿素配施DCD没有进一步增加玉米和水稻的产量,DCD抑制土壤硝化作用的效果不稳定。

Preliminary Study on Response of Maize and Rice to Polymer- coated Urea in Burozem

One year field-plot experiment was conducted on Bureazom to study the changes of soil ammonium,nitrate, biological characters and yields of maize and rice after application of thermoplastic resin coated urea MEISTER. The results showed that application of coated urea MEISTER kept soil ammonium and nitrate steadily in higher levels, and increased maize and rice yields by 5.1 and 15.1%, respectively. When application rate of the coated urea MEISTER was diminished by 20%, maize and rice yields were almost identical with those of urea split application, but those of maize root and leaf and N contents of rice stalk and root were significantly decreased. The coated urea MEISTER combined with dicyandiamide (DCD) didn't further increase maize and rice yields. Moreover, the nitrification inhibition effect of DCD was not steadily.