庄浪县马铃薯施钾肥的效果

The Experiment of Applying Potassium on Potato in Zhuanglang Country

在庄浪县黄绵土上马铃薯基施不同量的钾肥的试验结果表明,在施钾(K2O)112.5～337.5kg/hm2的范围内,马铃薯产量随着钾肥用量的增加而提高,各处理较对照增产3700～8000kg/hm2,增产率8.4%～18.3%;而当施钾量增至450.0kg/hm2时则比施钾337.5kg/hm2的产量降低2900kg/hm2。从产量与投入综合考虑,以施钾337.5kg/hm2效果最好。

The experiment of different potassium level on potato was conducted in zhuanglang country with loess of soil texture.The result of the experiment indicated that the yield of potato improved with the increasing of potassium applying,while the gross of varied between 112.5 kg/hm^2 and 337.5 kg/hm^2.The yield of each treatment increased from 3 700 kg/hm^2 to 8 000 kg/hm^2 compared to check treatment, and the rate of increase were 8.4% to 18.3%.But when the gross of K 2O increased from 337.5 kg/hm^2 to 450.5 kg/hm^2 the yield of potato had decreased by 2 900 kg/hm^2.Taking the yield and input into account,the effect of applying K 2O 337.5 kg/hm^2 was the best.