运用 15 N示踪技术 ,研究了雹灾后施氮配合中耕对棉花氮素吸收、利用和棉花——土壤氮素平衡的影响。结果表明 ,在蕾期遭受雹灾的情况下 ,施氮配合中耕的处理灾后 3日开始吸收肥料氮 ,单纯施用氮肥处理灾后 6日才开始吸收肥料氮。中耕处理的棉株单株氮素积累量高 ,且吸收肥料的比率增加。中耕还明显提高籽棉和根系中肥料氮的分配率 ,显著提高肥料利用率。 Using 15 N tracer technique, the effects of nitrogen application and combined cultivation on cotton nitrogen uptake and utilization and cotton-soil nitrogen balance after hail disaster were studied. The results showed that fertilizer nitrogen was absorbed on the 3rd of the 3rd day after the treatment of N and N during the budding stage, and fertilizer nitrogen was only absorbed on the 6th after the N application. The single plant nitrogen accumulation of cotton plants under cultivation was high and the ratio of absorbed fertilizer increased. Cultivation also significantly increased the distribution of fertilizer nitrogen in seed cotton and roots, significantly improving fertilizer utilization.