POTASSIUM DEFICIENCY ON UPPER LEAVES-TOP DIE BACK Posted on September 15, 2018 by Paul Benson Here is a great university article about Potash deficiency showing up this time of year as “top die back” https://extension.entm.purdue.edu/newsletters/pestandcrop/article/potassium-deficiency-on-upper-soybean-leaves-is-not-uncommon-during-seed-fill/