Studies on the potassium nutrition of the apple and peach. The effect of potassium fertilizer on the potassium content of soil and tree, growth and yield of tree, and keeping quality of fruit. The absorption, distribution and seasonal movement of potassium in young apple, trees, and the effect of potassium fertilizer on potassium and nitrogen content and growth of tree
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Cooper, Charles Burleigh (1951)
Stoddard, David Lee (1947)
Phosphorus and potassium as influenced by one another and calcium in reference to their availability in Maryland soils Damaty, Abdel Halim abd Allah (1952)