氮肥运筹对粮饲兼用型玉米生理特性的影响

Influence of Nitrogen Fertilizer Application on Physiological Characteristics of Foodstuff Maize in Keorqin Region

以金山10为试验材料,采用不同氮肥用量及氮肥与有机肥配比试验,研究了氮肥运筹对粮饲兼用型玉米叶面积指数、叶重比、干物重、绝对生长率和相对生长率的影响,结果表明:随着生育的进程和氮肥施用量增加,玉米的叶面积指数和干物重均增加,抽雄期达最高值,其中优化施氮效果最佳;玉米叶重比从苗期到抽雄期呈下降趋势,苗期达到最高值.玉米的绝对生长率和相对生长率均为苗期-大口期达最高,大口-抽雄期下降,其中玉米的相对生长率下降速度较快.

Jinshan 10 was used to study the influence of nitrogen fertilizer on leaf area index(LAI)、leaf weight ratio (LWR)、dry matter accumulation、relative growth rate(RGR)and absolute growth rate(AGR)of foodstuff maize under different N application and N with organic matter. The results showed that dry matter accumulation and LAI in-creased with the growing and the increase of N application, and that reached the highest at tasseling stage, the result expressed the best under optimized application. But the LWR showed the reversed trend, it decreased from seedling to tasseling stage, the highest LWR appeared in seedling stage. AGR and RGR reached the highest during seedling to flare opening stage, then decresed from flare opening to tassedling stage, RGR decresed more slowly than AGR.