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A Salinity-Fertility Interaction Study on Corn and Cotton¹

ABSTRACT

The effect of N and P application on yield and nutrient content of corn (Zea mays L.) and cotton (Gossypium barbadense), under different soil salinity levels, was tested in the greenhouse. Reduction in corn response to N due to salinity was evaluated by fitting a concurrent straight lines model to the dry matter yield data. The response was reduced to 79, 71, and 67% of the nonsaline soil for 5, 7, and 9 mmhos/cm., respectively. Specific activity measurements indicated that salinity had no marked effect on the availability of P fertilizer. Results obtained by the dodecahedron design used for the cotton experiment confirmed those obtained for corn and indicated that K content decreased with salinity. The poor response to fertilizer application is mainly attributed to decreased photosynthesis and poor utilization of photosynthate in the presence of high osmotic pressure in the root medium and secondarily, to disturbed inorganic nutrition.

Key Words: nitrogen • phosphorus • potassium • specific activity

¹ Contribution from the Department of Soils, Collge of Agriculture, University of Alexandria, U.A.R.

² Graduate Student, Associate Professor, and Professor of Soils, respectively.

Received for publication December 7, 1966. Accepted for publication April 21, 1967.