摘要
Abstract
Field experiments were conducted to study the effects of different application amount of nitrogen fer-tilizer on maize yield,benefit and nutrient absorption. The results show that N fertilization increased yield by 10. 2% ~ 23. 2% and profit by 173 ~ 2 312 yuan / hm2 compared with the treatment without nitrogen fertilizer, economic optimum N fertilizer rate was 230 kg / hm2 in Chaoyang ,whereas in Changtu ,N fertilization in-creased yield by 21. 3% ~ 53. 2% and profit by 2 539 ~ 6 132 yuan / hm 2 ,economic optimum N fertilizer rate was 245 kg / hm2 . N,P,K uptake rate was increased and N utilization efficiency was decrased with N applica-tion rate increasing,N utilization efficiency was 12. 6% ~ 35. 2% and 22. 2% ~ 44. 6% in Chaoyang and Changtu respectively. Reasonable application of nitrogen fertilizer was necessary to improve fertilizer utilization ratio.关键词
玉米/氮肥/产量/利润/养分吸收Key words
Maize/Nitrogen fertilizer/Yield,Profit/Nutrient absorption分类
农业科技
