Most Nebraska soils are well supplied with potassium. Potassium levels are generally high in the surface soil and in the subsoil. Even though soybeans use large quantities of potassium, using potassium fertilizer is usually not profitable. Table II shows potassium fertilizer guidelines for soybeans based on data from other states. When soil tests indicate a need, potassium fertilizer is suggested according to these guidelines.
Potassium fertilizer is best applied broadcast and incorporated into the soil prior to planting.
If potassium is applied in a band beside the seed at planting time, special care must be taken to place the fertilizer at least two inches from the seed to avoid seedling injury. Exchangeable K Micronutrient Suggestions Iron Lime-induced chlorosis, sometimes referred to as iron deficiency, is a common problem on high pH soils. These soils occur in the Platte, Elkhorn, and Republican River valleys and some of their tributaries. Refer to recent research for varieties that have shown tolerance. Some soil conditions are too severe for even the most tolerant varieties.