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本文系棉花氮素营养诊断研究的一部分。田间试验结果表明,棉花籽棉产量与氮素用量的关系呈抛物线方程:y=a+bx+cx~2。在棉麦两熟制的潮土棉区,纯亩纯氮12—15公斤,籽棉总产及施肥经济效益最高,其经济最佳施氮量的籽棉产量相当于最高产量的99.5—99.8％。测定叶片含氮量,用以指导棉花施用氮肥,可减少氮肥投入,提高施氮经济效益。
This paper is a part of the research on cotton nitrogen nutrition diagnosis. Field experiments showed that the relationship between cotton seed cotton yield and the amount of nitrogen was a parabolic equation: y = a + bx + cx ~ 2. In the cotton and cotton field, the area of pure cotton soil is 12-15 kg of pure nitrogen, with the highest economic benefit of total seed cotton production and fertilizer application. The output of the seedling with the best economic nitrogen fertilizer is equivalent to 99.5-99.8% of the highest output. Determination of leaf nitrogen content, to guide the application of nitrogen fertilizer, cotton can reduce the input, improve nitrogen economic benefits.