不同水肥处理对马铃薯肥料利用效率的影响

通过大田试验,以补水量X_1、氮肥量X_2、磷肥量X_3、钾肥量X_4为试验因素,选用4因素10水平的均匀设计,研究不同补水量以及氮、磷、钾配施对马铃薯肥料利用率的影响。通过偏最小二乘和逐步回归建立N、P、K肥利用效率与试验因素的回归模型。结果表明:过量施肥会导致肥料利用率降低,各因素对N、P、K肥料利用效率影响差异显著(P0.05);各因素对N肥利用率影响顺序为:X_4X_2X_1X_3,对P肥利用率影响顺序为:X_3X_1,均大于X_2和X_4,对K肥利用率的影响顺序为:X_4X_3X_2X_1。在实验条件下,推荐补水施肥方案为:补水量为1 058.5m~3/hm~2,N、P_2O_5、K_2O分别为241.05、380.6、93.5kg/hm~2。

The Effect of Different Water and Fertilizer Conditions on the Fertilizer Using Efficiency of Potato

To Study on The effect of different water and fertilizer conditions on the fertilizer using efficiency of potato,The study was conducted to research the effect of supply water quantity,nitrogenous fertilizer,phosphate fertilizer and potash fertilizer onthe fertil-izer using efficiency of potato,The experiment was carried out with uniform design U10?(108 )and designed with four factors inclu-ding irrigation norm(X1 ),nitrogenous fertilizer (X2 ),phosphate fertilizer (X3 ),and potash fertilizer (X4 )with ten levels for each factor.The regression models were established between the N,P,K fertilizer using efficiency and experimental factors by stepwise re-gression.The results showed that the experimental factors followed by the importance which had affected on N fertilizer using effi-ciency ranged as follows:X4 ,X2 ,X1 ,X3 ,which had affected on P fertilizer using efficiency ranged as follows:X3 ,X1 then X2 and X4 were less important,and which had affected on K fertilizer using efficiency ranged as follows:X4 ,X3 ,X2 ,X1 .Under this exper-imental condition,recommend hydrating fertilization scheme for:irrigation norm was 1 058.5 m3/hm2 and N、P2 O5、K2 O were 241.05,380.6,93.5 kg/hm2.