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在保护地栽培条件下,采用裂区设计,研究不同有机肥用量和氮肥用量配施对黄瓜NO3--N含量、不同层次土壤NO3--N含量动态变化的影响。结果表明:增施氮肥显著提升黄瓜果实NO3--N含量,氮肥与有机肥配合能够降低黄瓜NO3--N含量,交互作用极显著。高有机肥用量与高氮肥用量施用及施用氮肥不配合有机肥,保护地黄瓜NO3--N含量达到二级污染程度。黄瓜NO3--N含量、土体NO3--N的供应水平和积累量与有机肥、氮肥的施用密切相关,高量施用有机肥上层土壤NO3--N易积累,高氮肥用量(N3)处理易使土体积累NO3--N,施用有机肥能够减弱土壤中NO3--N的淋失。生产中降低黄瓜NO3--N含量和土体NO3--N淋失、积累量的施肥措施是:施用有机肥量为45~90 thm-2,施用纯氮水平为450~750 kghm-2。
Under the protective cultivation conditions, the split zone design was adopted to study the effects of different organic manure and nitrogen fertilizer rates on the dynamic changes of NO3 - N and NO3 - N in different soil layers. The results showed that increasing nitrogen fertilizer could significantly increase NO3 - N content in cucumber fruits. The combination of nitrogen fertilizer and organic fertilizer could reduce NO3 - N content in cucumber, and the interaction was significant. The application of high organic fertilizer and high nitrogen fertilizer and the application of nitrogen fertilizer did not cooperate with organic fertilizer, and the NO3 - N content of cucumber in protected area reached the second pollution level. The contents of NO3 - N in cucumber and NO3 - N supply and accumulation in soil were closely related to the application of organic manure and nitrogen fertilizer. The NO3 - N accumulation in the upper organic manure and the high N fertilizer application rate Easy to make soil accumulation NO3 - N, the application of organic fertilizer can reduce soil NO3 - N leaching. The measures to reduce NO3 - N content in cucumber and NO3 - N leaching and accumulation in soil were 45 ~ 90 thm-2 organic fertilizer and 450 ~ 750 kghm-2 nitrogen fertilizer.