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针对星云湖径流区蔬菜面积扩大、过量施肥,导致土壤养分残余量加大,对湖水质量产生影响的实际问题,采用田间试验研究不同施肥技术对洋葱产量的影响,探讨了试验前后不同土层养分变化情况。结果表明:不同施肥技术对洋葱产量影响不明显,以每公顷施N450kg、P2O50kg、K2O150kg,并采用10%氮肥及50%钾肥作基肥施于移栽沟中、20%氮肥移栽后15天兑水追施、70%氮肥及50%钾肥鳞茎膨大初期兑水追施的施肥技术产量最高。0～35cm层及35～50cm层的土壤速效N残余量随着施N量的增加而显著提高,而50～75cm层的土壤速效N残余量则略有降低;0～35cm层的土壤有效P及速效K的残余量相应地随着P2O5、K2O施用量的增加而显著提高,但耕作层以下的各层土壤有效P及速效K的残余量只是略有提高。
In view of the practical problems of vegetable area in Xingyun Lake runoff area, such as the increase of vegetable area, over fertilization, the increase of soil nutrient residue and the impact on the quality of the lake water, field experiments were conducted to study the effects of different fertilization techniques on onion yield. Changes. The results showed that the effects of different fertilization techniques on onion production were insignificant. Applying N450kg, P2O50kg and K2O150kg per hectare and using 10% nitrogen fertilizer and 50% potassium fertilizer as basal fertilizer applied to transplanting ditch, 20% Water topdressing, 70% of nitrogen and 50% of potassium bulking early watered top fertilization technology yield. Soil available N residuals of 0 ~ 35cm and 35 ~ 50cm layers increased significantly with the increase of N application rates, while available N residuals of 50 ~ 75cm layers decreased slightly. Soil available P And the residual K of available K were correspondingly increased with the increase of P2O5 and K2O application rates. However, the residual P of soil available P and available K were only slightly increased in the layers below the tillage layer.