Effect of Potash Fertilization on the Salt Tolerance of Maize, Irrigated with Saline Water

The effect of applying high levels of Potash fertilizer, on the salt tolerance of maize, was investigated under greenhouse experimental conditions. It was found that high levels of applied K significantly reduced the uptake of Na, and resulted in approximately 20% greater dry matter yield compared to the control (KQ) treatments. The K/Na ratio in the maize tops, was shown go be a good index of salt injury. Ratios of K/Na less than 10 were associated with poor yields. The effect of high salinity and Potash applications on the uptake of other nutrients was also ivestigated. High levels of Potash consistently decreased Magnesium and Nitrogen uptake, but somehow slightly increased Phosphate uptake. The practical implications of using Potash applications to offset salinity injuries, caused by using saline irrigation water, are discussed, within the context of a nutrient balance for maize