氮磷钾肥运筹对设施茼蒿产量及硝酸盐含量的影响

Effects of N,P,K Managements Mode on Yield and Nitrate Content of Garland Chrysanthemum(Chrysanthemum coronarium L.) in Greenhouse

以茼蒿为试材,通过盆栽试验,研究了不同氮、磷、钾肥配比对茼蒿产量与硝酸盐含量的影响。结果表明:施用氮肥的增产效应最好,增产达167%;磷肥增产91.7%;钾肥增产88.5%。氮肥对茼蒿硝酸盐含量的削减效应最强,削减率达23.4%;磷肥削减7.1%;钾肥削减0.4%。采用二次多项式回归方法对试验产量和硝酸盐含量分别进行肥料效应回归模型模拟,得出回归模型为氮、磷、钾三元二次多项式,由此综合茼蒿产量、经济效益和生态效益得到推荐施肥量。

Taking garland chrysanthemum as test material, the effects of different nitrogen, phosphorus and potassium fertilizer ratio on yield and nitrate content of garland chrysanthemum （Chrysanthemum coronariurn L. ） in greenhouse in winter was studied via the pot experiment. The results showed that nitrogen fertilizer application had the best yield-increasing effect on garland chrysanthemum （yield-increasing rate 167 %）, followed by phosphor fertilizer （91.7 %） and potassium fertilizer （88. 5%）. Nitrogen fertilizer application had the strongest nitrate-reducing effect on garland chrysanthemum （nitrate-reducing rate 23. 4%）,followed by phosphor fertilizer （7. 1%） and potassium fertilizer （0. 4 %）. The regressive model of fertilizer effect was simulated by the method of quadratic polynomial regressions to test yield and nitrate content respectively. The regression model was gotten as the ternary quadratic polynomials of nitrogen, phosphorus and potassium. According to the constructed models and complex of yield, economic and ecological benefits, fertilizer application for garland chrysanthemum was put forward.