缓释尿素施用量对韭菜生长和土壤有效氮的影响

采用盆栽试验，研究了缓释尿素的不同施用量对韭菜生长、产量、效益及对土壤有效氮含量的影响。试验结果表明：施用缓释尿素能明显促进韭菜的生长发育，但过量的施用缓释尿素对韭菜的生长有抑制作用，表现为株高、茎粗和叶宽等指标明显的降低；韭菜的产量和经济效益在处理4（T4）达到最高，分别为65573.85 kg/hm2和131147.7元/hm2，以后均逐渐下降，各处理之间差异极显著；缓释尿素施用量增加，土壤有效氮的含量逐渐增加，二者成正相关，相关系数为0.9869。过量的施用缓释尿素会降低韭菜的产量和效益，盆栽韭菜每次最适宜的缓释尿素施用量应为450 kg/hm2，缓释尿素能有效的增加土壤有效氮的含量。

Effect of Different Doses of Controlled-release-urea on the Growth of Chinese Chive and Soil Available Nitrogen

The effect of different doses of controlled-release-urea on the growth, yield and economic benefit of Chinese chive and soil available nitrogen was researched by cultivating it in basins. The results showed that appropriately use of controlled-release-urea could promote the growth of Chinese chive significantly, but the excessive doses of controlled-release-urea would inhibit it, which obviously lowered plant height, stem diameter and leaf width. There was a significant difference among the groups and group4 （T4） obtained the highest yield and economic benefit, were 65573.85 kg/hm^2 and 131147.7 yuan/hm^2, then those of other groups decreased gradually. Soil available nitrogen and the doses of controlled-release-urea were positively related, and the correlation coefficient was 0.9869. Excessive application of controlled-release-urea would reduce the yield and economic benefit, the optimum dose of controlled-release-urea for Chinese chive should be 450 kg/hm^2 every time. The use of controlled-release-urea can effectively increase the soil available nitrogen.