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应用电子计算机和二次通用旋转组合设计法，以玉米种植密度和Ｎ、Ｐ、Ｋ施肥量为供试因子，玉米籽粒产量和经济效益为目标，得出了夏玉米产量分别为≥１０５００ｋｇ／ｈｍ２，１１２５０ｋｇ／ｈｍ２和１２０００ｋｇ／ｈｍ２的高产高效益的种植密度和Ｎ、Ｐ、Ｋ施肥方案。种植密度为９７２００株／ｈｍ２，施纯Ｎ３３２４ｋｇ／ｈｍ２，施Ｐ２Ｏ５１１１８ｋｇ／ｈｍ２和Ｋ２Ｏ１５００ｋｇ／ｈｍ２，籽粒产量≥１０５００ｋｇ；种植密度１０５０００株／ｈｍ２，施纯Ｎ３６７２ｋｇ／ｈｍ２，施Ｐ２Ｏ５１１００ｋｇ／ｈｍ２和Ｋ２Ｏ１５０ｋｇ／ｈｍ２，籽粒产量≥１１２５０ｋｇ／ｈｍ２；种植密度１０５０００株／ｈｍ２，施纯Ｎ４３９４ｋｇ／ｈｍ２，施Ｐ２Ｏ５１２００ｋｇ／ｈｍ２和Ｋ２Ｏ１５０ｋｇ／ｈｍ２，籽粒产量≥１２０００ｋｇ／ｈｍ２。籽粒产量从１０５００ｋｇ／ｈｍ２增加到１２０００ｋｇ／ｈｍ２，扣除成本每ｈｍ２纯收益增加６０３５元。
With computer and quadratic universal rotary combination design method, the corn planting density and N, P and K fertilizers as test factors, corn grain yield and economic benefits as the goal, the yield of summer maize were ≥10500kg / hm2 , 11250kg / hm2 and 12000kg / hm2 of high yield and high efficiency of planting density and N, P, K fertilization program. Planting density of 97200 plants / hm2, applying pure N332 4kg / hm2, applying P2O5111 8kg / hm2 and K2O150 0kg / hm2, grain yield ≥10500kg; planting density of 105000 plants / hm2, applying pure N367 2kg / P2O51100kg / hm2 and K2O150kg / hm2, grain yield≥11250kg / hm2; planting density 105000 plants / hm2, applying pure N4394kg / hm2, applying P2O51200kg / hm2 and K2O150kg / hm2, and grain yield≥12000kg / hm2. The grain yield increased from 10500kg / hm2 to 12000kg / hm2, and the deduction cost increased by 603.5 yuan per hm2 of net income.