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通过田间试验研究了不同施氮量对大拱棚土壤、芹菜产量的影响。结果表明,随施氮量的增加供试土壤全盐量显著增加,pH显著降低,碱解氮含量持续增加,有机质含量呈现先增加后降低的趋势;芹菜产量与施氮量呈典型的抛物线关系,即施氮量低于523.5 kg/hm2时,随着施氮量的增加,芹菜产量增加,但进一步增加施氮量导致产量下降。
Field experiments were conducted to study the effects of different nitrogen application rates on the yield of soil and celery in large arch sheds. The results showed that with the increase of nitrogen application, the total salt content of soil increased significantly, the pH value decreased significantly, the content of alkaline hydrolysis nitrogen continued to increase, and the content of organic matter increased at first and then decreased; the yield of celery was a typical parabola with nitrogen application rate , That is, when the nitrogen application rate was lower than 523.5 kg / hm2, the celery yield increased with the increase of nitrogen application rate, but the yield of celery decreased with the increase of nitrogen application rate.