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为了解种植密度及氮、磷、钾肥用量对苗用型大白菜产量的影响。采用四元二次正交旋转组合设计,通过大田试验建立了苗用型大白菜产量与种植密度及氮、磷、钾肥用量因子的数学模型,并对各单一因素及两两因素的耦合效应进行了分析。结果表明:在其他因子为中间水平时,苗用型大白菜产量分别随种植密度、施氮量、施磷量、施钾量的增加先增加后减少。各试验因素对苗用型大白菜产量影响的大小排序为:施氮量(X_2)>种植密(X_1)>施磷量(X_3)>施钾量(X_4)。交互效应表现为,种植密度与施氮量、种植密度与施磷量呈正交互作用,且种植密度与施氮量的交互效应大于种植密度与施磷量的交互效应。种植密度或氮、磷、钾肥用量过高或过低均不利于苗用型大白菜产量的增加,中等种植密度配施中量氮、磷、钾肥,有利于苗用型大白菜产量的增加。
In order to understand the planting density and nitrogen, phosphorus and potassium fertilizer on seedling-type cabbage yield. The quaternary quadratic orthogonal rotation combination design was used to establish the mathematic model of the yield and planting density of seedling Chinese cabbage and the dosage factors of N, P and K fertilizers by field experiments. The coupling effects of single factors and two or two factors Analysis. The results showed that when the other factors were middle level, the yield of seedling-type Chinese cabbage increased first and then decreased with the increase of planting density, N application rate, P application rate and K application rate. The order of influencing factors on the yield of seedlings of Chinese cabbage was as follows: nitrogen application (X_2)> planting density (X_1)> phosphorus application (X_3)> application of potassium (X_4). The interactive effect was that there was an orthogonal interaction between planting density and nitrogen application rate, planting density and phosphorus application rate, and the interaction effect between planting density and nitrogen application rate was greater than that between planting density and phosphorus application rate. Planting density or nitrogen, phosphorus and potassium levels too high or too low are not conducive to the growth of seedling-use Chinese cabbage yield, medium planting density with the amount of nitrogen, phosphorus and potassium fertilizer is conducive to the growth of seedling-type Chinese cabbage.