Interaction of Phosphorus and Potassium on Maize (Zea mays L.) in Saline-Sodic Soil

Z. Hussain, R. Khattak, I. Fareed, M. Irshad and Q. Mahmood

Journal of Agricultural Science, 2015, vol. 7, issue 3, 66

Abstract: Salinity and nutrient deficiencies are the main constraints for high crop productivity. Interaction of diammonium phosphate and potassium sulphate in saline-sodic soil for maize (Zea mays L.) crop was investigated. The results demonstrated that maize responded well to K and P fertilization in saline-sodic soils. The effects of salinity and sodicity were ameliorated by the application of K and P fertilizers resulting in higher yield. K had greater influence on grain yield than P level. K application increased yield related parameters. The addition of P significant affected leaf [P] and [Na] content, Na-K and Ca-Na ratios. Potassium levels had significant effects on [Na], [K], [Mg] and Na-K ratio. Phosphorus and K interactions did not affect leaf chemical composition except Mg content. The P application resulted in an increase of [P] in maize leaf tissue as compared to control. A decrease in [Na] and Na-K ratio was observed with the addition of K. There was positive relationship between grain yield (R2 = 0.67), dry matter yield (R2 = 0.76) and leaf [P], respectively in soils treated with P. The tissue [Ca], ratios of Ca-K and Ca-P were non-significantly affected by the K and P treatments. Extractable [P] increased after P treatments in the soil. The application of K significantly decreased Na-K ratios in the soil. The decreasing trends of [Na] and Na-K ratios depicted a negative (R2 = 0.91) correlation between Na-K and soil [K]. Such interaction of K and P could mitigate the adverse effects of salinity and sodicity.

Date: 2015
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