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该文通过对春小麦２年田间水肥试验结果分析表明：①水肥对春小麦产量、收入有明显的主效应与交互效应。在试验范围内（水分为９％～１８％，肥料为５～２０ｋｇ／亩），水分平均主效应（以１．５％个土壤水分为１个单位）＞肥料平均主效应（以２．５ｋｇ／亩为１个单位）。②春小麦的水肥产量、收入效应为报酬递减函数，生产中存在一个经济合理的水肥耦合区，通常肥料为５～１６．０ｋｇ／亩时，需９％～１７．８％的水分与之配合；若肥料投入超过１６．０ｋｇ／亩至１９．８ｋｇ／亩，并要求亩产在３００ｋｇ以上时，则需１５．５％～１８％的水分与之配合。③在合理区域内，水肥均呈正效应，且既有互补性，又有协同效应。其单位用量产量互补效应为１９．４ｋｇ：１６．５ｋｇ，协同效应为１．５ｋｇ。④水肥主次效应的转换阈值１４．１％，即土壤水分大于１４．１％时，肥效＞水效；水分小于１４．１％时，水效＞肥效；水肥最高产量的理论值为３３６ｋｇ／亩。
The results of two years of experiment on water and fertilizer of spring wheat show that: (1) Water and fertilizer have obvious main effect and interactive effect on spring wheat yield and income. Within the experimental range (9% -18% of water and 5-20 kg of fertilizer), the average main effect of water (1.5% of soil moisture per unit)> the average main effect of fertilizer (2.5kg / Acre is 1 unit). (2) The yield and income effect of spring wheat is a decreasing return function. There is an economically reasonable water-fertilizer coupling zone in production. Generally, 9% -17.8% of the water is needed when the fertilizer is 5-16.0kg / mu. If the fertilizer input more than 16.0kg / acre to 19.8kg / mu, and require per mu in more than 300kg, you need 15.5% ~ 18% of the water with the match. ③ In a reasonable area, both water and fertilizer have a positive effect, and both complementarity and synergistic effects. The unit output volume of complementary effects of 19.4kg: 16.5kg, synergistic effect of 1.5kg. ④ The main effect of water and fertilizer conversion threshold of 14.1%, that is, soil moisture greater than 14.1%, the fertilizer effect> water efficiency; water less than 14.1%, water efficiency> fertilizer efficiency; water and fertilizer maximum yield of the theoretical value of 336kg / mu.