山药“3414”肥效试验研究

Study on the ′3414′ Fertilization Effects of Dioscorea Polystachya Turcz.

山药施用氮、磷、钾肥的"3414"试验研究结果表明:在该试验条件下,适量增施氮肥、磷肥、钾肥可以提高山药的产量,但是过量施用都会导致产量下降;通过建立回归方程并对回归方程的各项数据进行分析显示,山药产量与氮肥、磷肥、钾肥的施肥量之间存在着显著的回归关系,推荐山药最高产量纯氮、五氧化二磷、氧化钾的施用量分别是25.88、5.16、18.86 kg/667 m2,纯氮∶五氧化二磷∶氧化钾的最佳配比为1.000 0∶0.199 0∶0.729 5,最高产量为2 624.688 kg/667 m2。

An experimental study was conducted by application of nitrogen,phosphorous and potash on Dioscorea Polystachya Turez. The results showed that when the quantities of nitrogen, phosphorous and potash increased within a certain level, the yield of Dioscorea Polystachya Turcz. rose. But excessive application of nitrogen ,phosphorous and potash resulted in the decline of the yield. A regression equation was founded to study the optimal ratio of N,P205 ,K20 and the highest yield of Dioscorea Polystachya Turcz. The analysis of the regression equation showed that there were regressive relation between the yield of Dioscorea Polystachya Turcz. and the quantities of nitrogen,phosphorous and potash. And when the yield of Dioscorea PolystachyaTurcz. reached the highest,the fertilization quantities of nitrogen,phosphorous and potash were respectively 25.88,5.16 and 18.86 kg/667 m2. The optimal ratio of N、P2O5、K2O was 1.000 0：0.199 0：0.729 5. The highest yield ofDioscorea Polystachya Turez. was 2 624.688 kg/667 m2.