有机无机氮肥配施对芹菜产量、品质及土壤硝酸盐含量的影响

通过田间小区试验，研究不同比例有机无机氮肥配施对芹菜产量、品质及土壤硝态氮含量的影响。结果表明，不同比例有机无机氮肥配施均可以提高芹菜产量、改善芹菜品质，降低土壤硝态氮含量。有机氮配施比例为50%时芹菜产量最高，为121327 kg/hm2，与单施无机氮肥（100%N处理）相比，增产幅度达9.01%；Vc含量最高，为108.6 mg/kg，增幅达53.82%；硝酸盐含量最低，为1644.4 mg/kg，降幅为36.48%；随着有机氮配施比例的增高，土壤有机质含量逐渐升高，土壤硝态氮含量逐渐下降。

Effect of Combined Application of Organic Nitrogen and Inorganic Nitrogen Fertilizer on Yield, Quality of celery and soil Nitrate Content

A field plot experiment was conducted in Tianjin to study the effect of different ratio organic nitrogen and inorganic nitrogen fertilizer on yield, quality of celery and soil nitrate content. The results showed: the different ratio of organic nitrogen and inorganic nitrogen could increase the yield, improve the quality and decrease the soil nitrate content. In this study, yield of 50% ratio of organic nitrogen treatment was 121327 kg/hm2, higher than other treatments, contracted with 100%N treatment, increased by 9.01%; the Vc content was 108.6 mg/kg, increased by 53.82%; nitrate of celery was 1644.4 mg/kg, decreased by 36.48%. With the ratio of organic nitrogen increased, soil organic matter was increased and soil nitrate content was decreased after celery was harvested.