包衣尿素在春白菜上的应用效果研究

通过田间试验研究了普通尿素和包衣尿素不同用量、不同施肥方法(普通尿素为基肥 两次追肥;包衣尿素处理为70%的包衣尿素 30%的普通尿素一次性基施)对春白菜生长的影响。结果表明:包衣尿素处理在施氮量为N168kg/hm2的情况下产量与尿素习惯施肥处理(N240kg/hm2)接近,但显著高于等氮量尿素处理;包衣尿素处理氮素利用率达到了69.2%,氮肥生产率达到了257.6kg/kg,显著高于两个普通尿素处理;此外,采收后包衣尿素处理0～100cm土壤中硝态氮含量较普通尿素处理减少了24.6%～51.6%;各处理间鲜菜硝酸盐和Vc含量差异不显著。

Study on Effects of Coated Urea on Spring Chinese Cabbage

Field experiment was conducted to study the effect of coated urea and urea under different condition (with different dose and applied methods) on the growth of spring Chinese cabbage. Two urea treatments were applied in conventional way (basal dressing plus twice topdressing) with nitrogen application rate of 168 kg/hm2 (U168) and 240 kg/hm2 (U240) respectively, while coated urea treatment (PCU) was applied by basal application with nitrogen application rate of 168 kg/hm2 (mixture with 70% coated urea and 30% urea). The results showed that the spring Chinese cabbage yield with coated urea was comparable to that of U240 treatment, but significantly higher than that of U168 treatment. Nitrogen utilization efficiency and nitrogen production rate with coated urea were 69.2% and 257.6kg/kg respectively, significantly higher than those of U168 and U240 treatments. Compared to two urea treatments, after harvest the residual nitrate in 0-100 cm soil profile of PCU treatment decreased by 24.6%~51.6%. No significant difference of nitrate and vitamin C content was observed among treatments.