氮肥用量对玉米体内养分浓度和养分分配的影响

Effect of nitrogen application rates on the concentration and distribution of nutrients in maize

通过5年的田间试验,研究了不同施氮量对玉米产量、玉米体内养分浓度、养分分配及对每形成单位籽粒产量的吸收养分量的影响。结果表明,玉米籽粒和秸秆中P、K浓度随氮肥用量的增加有逐渐降低的趋势。玉米收获产品中N、K含量在籽粒和秸秆中的分配比与产量均呈现较好的相关性。玉米生长愈好(单产愈高),每形成单位经济产量的磷、钾消耗量愈少,说明良好的作物生长条件有利于提高作物体内养分的转化效率。

A consecutive 5 years field trial in the lower reach plain of Liaohe River was conducted to study the effect of different nitrogen apphcation rates on the yield, concentration of NPK, distribution of NPK in maize, and the harvested NPK from producing each unit of grains. The results showed that with the raise of N fertilizer rate, the concentration of P and K was decreasing. The results also indicated that there was significant correlation between the yield and the ratio of N and K content in grain and stalk. The better the crop growth, the less consumption of nutrients in producing each unit of grain products, implying that better condition of crop growth was beneficial to increase the utilization efficiency of nutrients.