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通过盆栽试验研究了膜下滴灌条件下不同土壤盐度水平和施氮量对棉花生长的影响。研究结果表明低盐度处理,随着施氮量的增加棉花株高显著增加;而在土壤盐度较高的条件下棉花株高则随着施氮量的增加显著降低。棉花籽棉和总干物质重随土壤盐度的增加显著降低,合理的施用氮肥可显著提高籽棉重和总干物质积累量。棉花的氮素吸收量受盐分、施氮量和盐氮交互作用影响显著。随着土壤盐度的增加,棉花氮素吸收量显著降低。在低盐度条件下,增加氮肥施用量可显著提高棉花的氮素吸收量;中量盐度下,适量的氮肥施用可显著提高棉花的氮素吸收量,但施用量过大并不能增加棉花的氮素吸收量;高盐度条件下,盐分是限制棉花生长和氮素吸收的主要因素,施用氮肥对棉花的氮素吸收量无显著影响。
The pot experiment was conducted to study the effects of different soil salinity levels and nitrogen rates on cotton growth under drip irrigation. The results showed that under low salinity treatment, the plant height of cotton increased significantly with the increase of nitrogen application rate; while the plant height of cotton increased significantly with the increase of nitrogen application rate under the condition of high soil salinity. Cotton seed cotton and total dry matter weight decreased significantly with the increase of soil salinity, and the rational application of nitrogen fertilizer could significantly increase the seed cotton weight and total dry matter accumulation. The nitrogen uptake by cotton was significantly affected by salt, nitrogen application and salt-nitrogen interaction. With the increase of soil salinity, cotton nitrogen absorption decreased significantly. Under the condition of low salinity, increasing the amount of nitrogen application could significantly increase the nitrogen uptake of cotton; medium amount salinity, nitrogen application could significantly increase the nitrogen uptake of cotton, but the application of excessive amount of cotton did not increase Under high salinity conditions, salinity was the main factor limiting the cotton growth and nitrogen absorption. The application of nitrogen fertilizer had no significant effect on the nitrogen uptake of cotton.