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Nitrogen-potassium relationships in cotton growing. I. Response of two varieties to potassium-application

Nitrogen-potassium relationships in cotton growing. I. Response of two varieties to potassium-application

Agro-chimica, 14: 533-538

At the same levels of available soil K (-3800 +or- 150 Delta F cal/mole) in a clayey grumusol (pH 7.7), the variety Acala 1517 C gave a positive response to KCl at 300 kg/ha K, while Acala 4-42 did not respond at all; as the positive response to K occurred at a high level of N (27.5 +or- 1.5 ppm NO3-N after incubation of the soil; application of 180 kg/ha N as 2SO4), it appears that there was an interaction between soil levels of K and N.

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