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设置高水(260mm)、中水(200mm)、低水(140mm)3水平的灌水量和高氮(270kg·hm-2)、中氮(180kg·hm-2)、低氮(90kg·hm-2)3水平的施氮量,进行完全组合设计,研究膜下分区交替滴灌和施氮对棉花干物质累积与氮肥利用的影响.结果表明:膜下分区交替滴灌棉花干物质量在中氮高水和高氮高水处理最高;与高氮高水处理相比,中氮高水处理干物质累积的施氮利用效率提高了34.0%～44.6%(平均提高34.7%),灌水利用效率降低了6.4%～10.7%(平均降低10.2%).对于棉花氮素累积,中氮高水处理的的施氮利用效率最高,高氮中水处理的灌水利用效率最高;与高氮中水处理相比,中氮高水处理的施氮利用效率提高了29.0%～41.7%,灌水利用效率下降了5.5%～14.0%.在棉花产量较高的水氮耦合处理中,中氮高水处理的棉花氮回收率、氮肥农学利用效率和表观利用效率均高于高氮中水和高氮高水处理,而氮肥吸收比例和氮肥生理利用效率无显著差异.表明中氮高水处理最有利于膜下分区交替滴灌水氮耦合效应的发挥.
Three irrigation levels of high water (260mm), medium water (200mm) and low water (140mm) were set. The irrigation amount was high at 270kg · hm-2 and middle nitrogen (180kg · hm-2) -2) 3, the complete combination design was carried out to study the effects of alternate drip irrigation and nitrogen fertilizer application on dry matter accumulation and nitrogen use efficiency of cotton.The results showed that the dry weight of cotton under alternate sub - Water and high-nitrogen high-water treatment were the highest. Compared with high-nitrogen and high-water treatment, nitrogen use efficiency increased by 34.0% -44.6% (average increase 34.7%), and water use efficiency decreased 6.4% ~ 10.7% (10.2% average reduction) .For nitrogen accumulation of cotton, N application efficiency was the highest in high N treatment and highest in N treatment. Compared with high N treatment , Nitrogen use efficiency increased by 29.0% ~ 41.7% and irrigation efficiency decreased by 5.5% ~ 14.0% in medium nitrogen high-water treatment. In the high-yield water-nitrogen coupling treatment, The recoveries, agronomic efficiency and apparent utilization efficiency of nitrogen fertilizer were all higher than those of high nitrogen and high nitrogen water, while the ratio of nitrogen absorption No significant differences in physiological fertilizer use efficiency of nitrogen show a high water partition alternately most conducive film dropwise under nitrogen Irrigation play coupling effect.