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通过三个3个不同养分水平土壤上菜心氮、磷、钾“3414”田间试验,所获得的3种肥料效应方程,求取最佳施肥量。结果显示:(1)净收入最多的处理,3个试验均基本是中等水平或1水平的处理,说明试验设计水平合理。(2)3个点肥料试验的一元二次效应方程中,均是N效应的显著度最高、P效应的显著度次之、K效应的显著度最差;二元二次效应方程中只有NP效应的显著度是3个试验均较高的,NK效应则只有2个试验的显著度相对较高而PK效应则仅有1个试验的显著度相对较高;3个试验的三元二次效应方程中只有2个试验的显著;但这属于显著的2个当中又有1个的N、P、K全是负效应。(3)氮、钾肥理论最佳施肥量的高或低,基本与试验地土壤碱解氮和速效钾含量水平相吻合;磷肥的理论最佳施用量和试验中产量较高处理的施用量不与试验地土壤速效磷含量水平相吻合,而与土壤pH值有关。
Three kinds of fertilizer effect equations were obtained from three field nutrient samples of three kinds of nutrient levels soils on which nitrogen, phosphorus, and potassium “3414” were applied to determine the optimum fertilization rate. The results show that: (1) The treatment with the largest net income and the three experiments are basically the medium level or the one level, which shows that the experimental design level is reasonable. (2) In the three-point fertilizers experiment, the quadratic effect equation of fertilizers showed the highest significance of N effect, followed by the significant effect of P effect and the worst significance of K effect. In the binary quadratic effect equation, only NP The significance of the effect was high in all three experiments, while in the NK effect there were only two trials with relatively high significance and the PK effect with only one test with a relatively high significance. The three trials were twice ternary There are only two trials in the effect equation that are significant; however, N, P and K, one of the two significant ones, are all negative. (3) The optimal fertilization rate of nitrogen and potash fertilizer is high or low, which is in good agreement with the soil available nitrogen and available potassium content in experimental soil. The optimal application rate of phosphorus fertilizer and the higher yield of fertilizer And experimental soil available phosphorus content level coincide, but with the soil pH value.