施氮量对杂交棉氮、磷、钾吸收利用和产量及品质的影响

在高产条件下,研究了不同施氮量对杂交棉氮、磷、钾的吸收利用和产量及品质的影响。结果表明,增施氮肥显著提高了杂交棉氮、磷、钾的积累量,特别是显著提高了杂交棉后期氮、磷、钾的积累量和积累比例。施氮量N300 kg/hm2的子棉产量最高,比施氮量N 225 kg/hm2处理增产0.9%,但差异不显著。氮、磷、钾养分利用效率随施氮量增加而提高;但氮肥利用率随施氮量的增加而下降。施氮可以显著提高纤维长度和纤维比强度,而不同施氮量处理间纤维长度和比强度差别不大。

Effects of nitrogen fertilization on uptake and utilization of NPK and yield and quality of hybrid cotton

Effects of nitrogen application rates on uptakes and utilizations of nitrogen (N), phosphorous (P), potassium (K) and yields and quality of hybrid cotton are studied under high yield cultivated conditions. The results show that accumulative amounts of N, P and K in hybrid cotton plants are increased when more nitrogen fertilizer are applied, especially at the later growth stages of the hybrid cotton. The yield is highest when N 300 kg/ha is applied, which is increased by 0.9% of the yield under the N 225 kg/ha treatment, and the difference is not significant. When increasing N fertilizer amounts, the nutrient utilization efficiencies of N, P and K are increased, however the N fertilizer utilization rate is decreased. The fiber length and fiber strength are increased under the N fertilization, but there are not significant difference among different nitrogen application rates.