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针对传统水肥方式中存在的投入过量问题 ,采用控制耕层土壤湿度以及应用KNS氮素推荐系统对菠菜的产量及水氮利用进行了研究。结果表明 ,推荐施氮处理与传统施氮处理对菠菜的生长没有明显的差异 ,而控制耕层土壤水分含量为植物有效的土壤含水量的 5 0 %～ 80 %及 6 0 %～ 90 %时的处理产量比传统灌水处理有显著性增加。推荐灌水施氮模式同传统灌水施氮模式相比 ,菠菜产量没有明显的差异 ,但是氮素以及水分供应量分别减少了 73.6 %和 39 2 % ,相应地水分利用效率提高 6 4% ,氮素利用效率也有显著提高。推荐的水氮处理在菠菜收获后土壤无机氮残留量比传统处理明显降低。因此在合理灌溉的基础上进行氮素推荐 ,可有效地解决蔬菜生产中产量与环境之间的矛盾
Aiming at the problem of excessive input in the traditional water and fertilizer regime, the yield and water and nitrogen utilization of spinach were studied by controlling the soil moisture of top layer and applying KNS nitrogen recommendation system. The results showed that there was no significant difference between the recommended nitrogen application and the traditional nitrogen application on the growth of spinach, while the controlled soil moisture was between 50% ~ 80% and 60% ~ 90% of the plant effective soil moisture content Of the treatment output than the traditional irrigation has significantly increased. Compared with the traditional irrigation and nitrogen application modes, there was no obvious difference in the yield of spinach, but the nitrogen and water supply decreased by 73.6% and 392% respectively, and the water use efficiency increased by 64% and the nitrogen Utilization efficiency has also been significantly improved. The recommended water-nitrogen treatment significantly decreased the content of inorganic nitrogen in the soil after the spinach was harvested. Therefore, on the basis of rational irrigation, nitrogen recommendation can effectively solve the contradiction between production and environment in vegetable production