南通市土壤的速效钾含量在80mg/kg以下的占95．25％以上；60mg/kg以下的占53．21％以上．土壤钾供应不足严重地影响了大豆生产，限制了大豆产量的提高．本文通过田间对比试验及根外追肥试验研究了大田生产条件下大豆的缺钾症状及施钾对产量构成的影响．一、材料与方法供试土填 Nantong soil available potassium content below 80mg / kg accounting for more than 95.25%; 60mg / kg accounted for more than 53.21%. Inadequate supply of soil potassium severely affected soybean production, limiting the increase in soybean production. In this paper, field trials and top-dressing experiments were conducted to study the effects of potassium deficiency on yield and composition of soybean under field conditions. First, materials and methods for test soil filling