优化氮肥管理对膜下滴灌海岛棉产量和品质的影响

通过连续2 a的田间试验,对南疆膜下滴灌棉田优化施氮处理和传统施氮处理以及不施氮处理的海岛棉产量和纤维品质进行比较。结果表明施氮显著增加了棉花产量,优化处理在保持棉花产量与传统处理持平的情况下,较传统处理节约氮肥用量11.69%,经济效益高638.26元/hm2,增加单铃重0.08~0.26 g,增加衣分含量0.8%~1.5%;在棉花纤维品质方面,1 a优化处理与传统处理、不施肥处理差别不大,但2 a连续优化处理与传统处理相比,能显著提高纤维长度和比强度,并保证马克隆值在最优级的范围内。

Effect of Optimized Nitrogen Management on Sea Island Cotton Yield and Fiber Quality under Plastic Mulch by Drip Irrigation

Compared with optimized N,conventional N and no N on sea island cotton yield and fiber quality under plastic mulch by drip irrigation,the continuous experiments had been carried out in same cotton field for 2 years,The result indicated that the cotton yield were obviously increased by fertilizing N.The optimized N treatment can reduce 11.69 percent of the rate of nitrogen fertilizer and add 638.26 yuan/hm~2.The optimized N treatment of 2 years could increase 0.08~0.26 g of boll weight and 0.8-1.5 percent of lint percentage as much of conventional N treatment.The optimized N treatment was not significant with conventional N and no N treatment on cotton fiber quality in first year.But compared with conventional N treatment in second year,the fiber length and strength had been increased obviously in optimized N treatment,and its micron value was in best range.