Abstract
Soluble salts in soils of Pakistan adversely affect the yield of wheat crop. The nutritional deficiency becomes additive factor. A pot study was therefore conducted to evaluate the ameliorative role ofN. The salinity levels (6,12 and 18 d, rn') were artificially developed with NaCl, CaCh , 2H20 and MgS04, 7H20. The ratio of Ca-Mg to Na was calculated according to the desired SAR while the ratio of Ca to Mg was 5:1. However the crop could not withstand at the highest salinity level of 18.0 ds m'. The study therefore, was repeated with salinity levels of 6,9 and 12 ds m,l during the year 1990-91. Three N levels (0, 80 and 160 kg ha") were used with each salinity level. The results indicated that the fresh and dry shoot weights at booting stage, plant height number of effective tillers, grain and straw yields at maturity and lOO-grain weight were negatively affected with salinity, while positively with N application. Lower rate of N (80 kg ha") was found to be economical under such adverse soil conditions.
