为优化大白菜生产氮肥适宜用量，提高产量和效益，开展了露地秋季大白菜氮肥总量控制试验，探讨不同施氮量对大白菜经济性状、产量和氮肥利用的影响。结果表明，不同施氮量对大白菜经济性状、产量和氮肥利用效率影响明显，合理的氮肥用量可改善大白菜经济性状，提高产量水平和氮肥利用效率；施氮量为12 kg／667m2时，大白菜单株重、单株净重与净菜率和株高、菜球直径等经济性状最好，产量最高，单产达3268．7 kg／667m2，氮肥利用率为34．4％，氮肥农学效率为37．3 kg／kg 。%To optimize nitrogen fertilizer application amount and enhance yield and benefit of Chinese cabbage,a control test of total nitrogen amount was conducted on Autumn Chinese cabbage in open field. Results:Different nitrogen application amount had significant influence on economic traits,yield and nitrogen utilization rate of Chinese cabbage,which could be improved with rational nitrogen application amount.When nitrogen application amount was 12 kg/667m2 , economic traits, including per plant weight,net weight per plant,net head rate,plant height and diameter,reached the best,the yield, nitrogen utilization rate and nitrogen agronomic efficiency reached 3 268.7 kg/667m2 , 34.4% and 37.3 kg/kg respectively.
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