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棉花产量及单位面积铃数和铃重,都随施氮量的增加呈抛物线变化,而衣分的变化不明显。氮素用量与棉花纤维整齐度和比强度也呈抛物线关系,中氮水平时,棉花纤维发育的关键酶活性最高。棉花纤维发育的关键酶活性与氮素水平和成铃时期存在交互作用。但是氮素水平对纤维长度和麦克隆值的影响还有待进一步研究。
Cotton yield and boll number and boll weight per unit area all showed a parabolic curve with the increase of nitrogen application rate, while the change of the lint percentage was not obvious. The amount of nitrogen also showed a parabola relationship with the regularity and specific strength of cotton fiber. The highest enzyme activity was found in the development of cotton fiber at medium nitrogen level. The key enzyme activity of cotton fiber development interacts with nitrogen level and boll age. However, the effect of nitrogen level on fiber length and micronaire needs to be further studied.