Effects of Density and Fertilizer on the Yield of Alisma plantago-aquatica
[Objective]To explore the influence of density and fertilizer ratio on the yield and their interaction,and screen out the scientific dense fertilizer level,so as to provide theoretical basis and practical experience for the standardized cultivation of Alisma plantago-aquatica.[Method]The effect function of density,nitrogen fertilizer,phosphorus fertilizer,potassium fertilizer and the yield of Alisma plantago-aquatica was established by using four-factor and five-level quadratic orthogonal rotation combination design for field experiment.[Result]The quadratic regression equation R2 was 0.9097,and the mathematical model was reliable.The effect of each factor on the yield of Alisma plantago-aquatica Linn.was in the order of density＞N＞K＞P,and the interaction effect between density and fertilizer was significant.According to the optimization of statistical frequency,the optimal agronomic measures for the target yield of diarrhea greater than 3300 kg/hm2 were obtained as follows:the density was 146900-150800 plants/hm2,nitrogen 219.10-234.50 kg/hm2,phosphorus 124.80-150.00 kg/hm2 and potassium 152.55-179.55 kg/hm2.[Conclusion]Both reasonable density and fertilizer application amount can effectively increase the yield of Alisma plantago-aquatica Linn.Density is the best,followed by nitrogen fertilizer,and potassium and phosphate fertilizer have less effect on increasing produc-tion.On the basis of ensuring density and nitrogen fertilizer,combining with reasonable phosphate and potassium fertilizer can achieve the goal of high yield of Alisma plantago-aquatica Linn.
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