棉花产量和群体干物质的积累是呈正相关的,而干物质的积累又与棉株对氮、磷的吸收状况密切相关。棉花吸收氮、磷的总量及各生育阶段的吸收动态,国内外一直有不少报导,但结果颇不一致。这除开与研究的方法不同有关之外,主要地还因为棉花吸肥受许多因素的影响,诸如品种、密度、年份、施肥量以及土壤中养分的有效程度等。我省棉花生育期中,前期雨水较多,花铃期往往伏旱,甚至伏、秋连旱,土壤类型也不一样,棉花吸收氮、磷的数量和进程如何,它与棉花群体干物质积累以及与产量形成的关系怎样,对这些进行深入的研究,探明在我省条件下棉花吸肥的规律,对改进栽培技术,促进棉花高产稳产是有重要意义的。 Cotton yield and population dry matter accumulation is positively correlated, and dry matter accumulation and cotton plant nitrogen and phosphorus absorption is closely related. The total amount of nitrogen and phosphorus absorbed by cotton and the absorption dynamics at each growth stage have been reported by many countries at home and abroad, but the results are quite inconsistent. Apart from the differences in the methods studied, the main reason is that the absorption of cotton by cotton is affected by many factors such as variety, density, year, amount of fertilizer applied, and the effectiveness of nutrients in the soil. During the cotton growing period in our province, there are more pre-rainy days, and the flowers and bolls are often inundated with drought. Even in the autumn and even in the autumn, the types of soils are different. The quantity and process of nitrogen and phosphorus absorbed by cotton are related to the accumulation of dry matter in cotton The relationship between the yield formation and how to carry out in-depth study of these to determine the law of cotton absorption under the conditions of cotton in our province, to improve the cultivation techniques to promote high and stable yield of cotton is of great significance.