忻州旱地玉米“3414”试验肥料效应分析

为了明确旱地玉米的氮磷钾肥施用量和贡献率以及三者之间的相互效应,以玉米为实验材料,对其进行＂3414＂田间肥效试验.结果表明：（1）单位面积玉米产量与氮磷钾施用量之间具有显著的回归关系,所获得的肥料效应方程与实际情况拟合较好.（2）氮磷钾单因素肥料效应均表现为随着施肥量的增加玉米产量增加,但增加到一定量后,产量反而开始下降.（3）氮磷钾肥对旱地玉米产量贡献最大的是氮肥,其次是磷肥,钾肥贡献最小.（4）忻州市旱地玉米的最佳推荐施肥量为每666.7 m2施用N 12.45kg、P2O5 5.53 kg、K2O 6.98 kg。

Fertilizer Effect of "3414" Experiment on Dryland Corn in Xinzhou

The fertilizer effect of"3414"experiment on dryland corn in Xinzhou from 2009 to 2010 was analyzed in order to explicating the dosage of application and contribution rate of N,P,K and their inter-effect among them.The result showed that(1)the yield of corns and the application of N,P,K in unit dry land area had a remarkable regression relationship.The obtained fertilizer effect equation is very familiar with the real situation.(2)according to the quadratic equation and trend line,the yeild of corns would increase with the application of single factor(such as N,P or K) increasing,but when reached a certain amount,the yield would stop increasing,moreover,they would decrease.(3)N makes the largest contribution to the production of corn.P is less important and K is the least.(4)the recommended optimum fertilization rate was N 12.45 kg/666.7 m2,P2O5 5.53 kg/666.7 m2,K2O 6.98 kg/666.7 m2.