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在花岗岩赤红壤上采用大田小区试验,探讨了不同供肥模式对豇豆硝酸盐累积的影响。结果表明(:1)细砂土上施氮对豇豆硝酸盐累积有重要作用,而NP、NPK处理的硝酸盐含量分别比NK低13%、14%,有降低硝酸盐含量的趋势;在不减少氮磷钾化肥条件下增施鸽粪、微肥,在促进豇豆生长的同时也促进了氮的吸收,但没有起到降低硝酸盐含量的作用。(2)粉壤土本身具有的氮素营养对豇豆硝酸盐累积有明显作用;在不减少氮磷钾化肥条件下增施鸽粪、微肥对粉壤土上的豇豆氮吸收及代谢还原都有一定抑制,但硝酸盐含量有累积增加的趋势。(3)合理单施鸽粪在2种类型土壤上均能显著降低豇豆硝酸盐的累积并维持相对高的经济产量,对于豇豆蔬菜的优质稳产有重要作用。
The experiment of field plot on red soil of granite was used to study the effect of different fertilizer modes on the accumulation of cowpea nitrate. The results showed that: (1) Nitrogen applied to fine sand had an important effect on the accumulation of nitrate in cowpea, while the contents of nitrate in NP and NPK decreased by 13% and 14%, respectively, Reducing the NPK fertilizers increased pigeon and micronutrients under the conditions of promoting the growth of cowpea and also promoted the absorption of nitrogen, but did not play a role in reducing the nitrate content. (2) Nitrogen nutrition of silty loam soil had a significant effect on the accumulation of nitrate in cowpea; the application of pigeon manure under the condition of not reducing the NPK fertilizers had some effect on the absorption and metabolism of cowpea nitrogen in silt soil Inhibition, but the nitrate content has a cumulative increase in the trend. (3) Reasonable application of pigeon manure significantly reduced the accumulation of cowpea nitrate and maintained a relatively high economic yield on both types of soils, which played an important role in the quality and stable yield of cowpea vegetables.