In 2015,the field experiment was conducted on the maize field in lime concretion black soil region of Zhumadian to study the effect of urea treatment on corn crop.The results showed that compared with the application of only phosphorus and potassium fertilizer,the application of nitrogen fertilizer significantly increased the yield of corn,increasing by 19.4％ to 41.8％.The yield of the two test sites was 8 632.7 kg/hm2 and 8 807.0 kg/hm2,with increasing 285.0 kg/hm2 and 142.5 kg/hm2.The reduction of 20％ nitrogen fertilizer on the basis of the best nitrogen application rate could significantly decrease maize yield,which indicated that there was a risk of reducing production by reducing the nitrogen fertilizer amount.%在河南省驻马店砂姜黑土上进行玉米田间试验,研究控施肥料一次性施肥技术.结果表明,与只施用磷钾肥相比,加施氮肥可显著提高玉米产量,增产幅度29.2％～52.3％;两个试验点产量最高的为控释尿素全部一次性基施处理,达到8 632.7 kg/hm2和8 807.0 kg/hm2,与等氮量处理相比提高了285.0 kg/hm2和142.5 kg/hm2;在最佳施氮量的基础上减施20％的氮肥,玉米产量下降,说明与农民习惯施肥相比,减施氮肥存在减产风险.
展开▼
