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氮、磷是高产玉米必需的营养元素，二者配合施用有更高的肥料效应。试验表明，关中灌区高产最佳施肥量为Ｎ１４６．４～２２０Ｋｇ／ｈｍ２；Ｐ２Ｏ５８２．１～９３．４Ｋｇ／ｈｍ２；最佳产量为９４４０～１０９９０ｋｇ／ｈｍ２。每公斤混合养分可增产玉米１３．２９Ｋｇ。
Nitrogen and phosphorus are essential nutrient elements for high-yielding maize, and they are used with higher fertilizer effect. The results showed that the best yield of Guanzhong irrigation area was N146.4 ~ 220Kg / hm2 and P2O582.1 ~ 93.4Kg / hm2. The best yield was 9440 ~ 10990kg / hm2. Each kilogram of mixed nutrients can increase corn 13.29Kg.