Effects of Different Nitrogen Forms on Spring Maize Yield,N Use Efficiency and Soil Nitrate Nitrogen

氮气 农学 肥料 氮缺乏 硝酸盐 尿素 化学 环境科学 生物 有机化学
作者
JI De-zh
摘要

Effects of nitrogen fertilizer types on the maize yield, variation of soil nitrate content in the 0-90 cmlayers with maize growing stages and nitrogen use efficiency(NUE) were carried out on a typical black soil in a fieldexperiment. The results showed that the 90 cm deep soil layer, soil residual nitrate was elevated by the applicationof nitrogen fertilizer by about 30%, but it decreased too with the growing stages of maize, and common urea re-mained 20% higher than that of control at harvest. Compared with common urea, soil nitrate content of controlled-re-lease nitrogen fertilizer decreased slowly in the early stage and fast in the lately stage, soil residual nitrate contentwas lower. Controlled-release compound fertilizer could meet the demand for maize growth earlier stage and laterstage of soil nitrate nitrogen, improve yield and maximize nitrogen fertilizer use efficiency to 55.41% and achievethe purpose of single fertilization. Yields and N use efficiency of sulfur coated urea fertilizer by single fertilizationwere the lowest. Compared with the other nitrogen treatments, there was a significant difference with those.

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