氮钾配施对夏玉米产量和养分含量动态变化的影响

为给夏玉米合理施肥提供科学依据,采用田间试验和土壤、植物诊断相结合的方法,研究不同氮钾肥配施对夏玉米产量和养分含量动态变化的影响。结果表明:在该地区的高磷土壤上,不施磷肥,合理配施氮钾肥,可以增加玉米产量1.8%-12.4%。其中,穗长增加1.8%-8.2%,穗粗增加1.3%-4.1%,穗粒数增加11.3%-22.5%,百粒重增加1.1%-4.8%。综合玉米产量、穗部性状、叶片以及土壤氮磷钾养分含量分析,在土壤含磷量为35.3 mg/kg时,以N2K2配施效果最好,玉米产量高达11 183.3 kg/hm2。

Effect of N and K fertilizer application on the yield and nutrient dynamic changes in maize

In order to provide scientific base of fertilization for maize,the method combining field trial and soil and plants' diagnosis was applied to study the effects of N and K fertilizer application on its yield and nutrient dynamic changes.The results indicated that: on the fields with high P level,without P fertilizer applied and combining N with K fertilizer could increase maize yield by 1.8%～12.4%,spike length,1.8%～8.2%,spike diameter,1.3%～4.1%,grain number,11.3%～22.5%,hundred-seed weight,1.1%～4.8%.Through the synthesis analysis of the field,spike characters and leaves nutrient content of N,P and K in maize,the treatment of N2K2 was the best and its maize yield was at 11 183.3 kg/hm2 while soil P content was at 35.3 mg/kg.