玉米钾肥肥效的研究报告

RESEARCH REPORT ON EFFECT OF POTASSIUM FERTILIZER FOR CORN

本试验是在基本满足玉米对氮磷肥需要的条件(每亩施硝铵33.3公斤,重过磷酸钙16.6公斤)下,以钾肥不同施用量(每亩分别施5、10、20、30、50公斤硫酸钾)为处理的单因素田间小区试验,整理23个点的试验资料取得如下结果。1.每亩施5公斤和10公斤硫酸钾的玉米相对产量与土壤速效钾测定值的相关关系分别为y=14.695+39.3959logx(r=0.4994*,n=16)和y=-10.4812+50.9209logx(r=0.513*,n=16)。2.用火焰光度计法测定的土壤速效钾测得值超过65ppm时,相对产量可以达到80％以上。3.从整个经济效益看,钾肥施用量以亩施5—10公斤硫酸钾为宜。

This expermient was carried out with the basically satisfaction for corn of nitrogenous and phosphorus fertilizers (500Kg/ha NH_4NO_3 and 250 Kg/ha of overlapping super phosphate). The amounts of potassium fertilizers in treaments are 75, 150, 300, 450, 750Kg/ha K_2SO_4. The results of this experiments in 23 locations are as following: 1.In the plots which applied 75, 150 Kg/ha K_2SO_4, the relationship between relative yields of corn and the analysis values of soil available potassium are separated:Y=14.695+39.3959logx(r=0.4994 n=16)Y=-10.4812+50.9209logx(r=0.513 n=16)2. The relative yields of corn would reach 80% if the analysis value of soil available potassium measuring by the flamephotometer is over 65ppm. 3.According to the benefit of economics, the preferable rate of potassium fertilizer is 75-150 Kg/ha K_2SO_4.