Effect of iron and sodium absorption ratio on ionic composition in cowpea

A pot experiment was conducted in kharif season during 2016 at S.K.N. College of Agriculture, Jobner, to study the effect of different levels of sodium absorption ratio and iron on ionic composition in cowpea. Four levels of each sodium adsorption ratio (SAR) 10, 15, 20, 25 and iron (Fe) control, 5, 10 and 15 kg/ha were tested in completely randomized design with three replications. The result indicate that higher Na content, Na/Ca, Na/K, Na+K/Ca and lower Ca, Mg, K content and Ca/Mg ratio in grain and straw of cowpea was noted with increasing level of SAR. Application of Fe narrowed down the Na content, Na/K, Na+K/Ca and Na/Ca ratio in seed and straw significantly, while it increase the Ca, Mg, K content and Ca/Mg ratio in seed and straw. Among the treatment combinations, combined application of SAR 15 with Fe (@ 20 FeSo4.7H2O) proved superior in all these parameters over other treatments.