In certain scale,applying potassic fertilizer and its yield shows a positive relation,1 kg potassium sulphate can increase the fresh Dioscorea zingiberensis about 15.64 kg,the net benefit is 28 yuan.

• 在一定范围内施钾量与盾叶薯蓣产量和效益呈正相关；每1kg硫酸钾可增产15.；64kg鲜蓣；新增纯收益28元。