N, P, K AND S STATUS OF WHEAT PLANT GROWN ON SALINE SOILS AS INFLUENCED BY GYPSUM, RICE HULL AND DIFFERENT SALINITY LEVELS

Abstract

The content and uptake of N, P and K in wheat decreased with the increased levels of salinity (6, 12 dS m-1) and plant age. But the content and uptake of S increased with the increased level of salinity and then decreased with plant age. The highest content of N, P and K in wheat at maturity was found 67.50 and 74.52, 45.68 and 55.97, 94.01 and 97.48 C mol kg-1 in Sonagazi and Badarkhali saline soils, respectively with the treatment of EC0G300H8. But in the both soils S contents were highest with the treatment of EC12G300H8 at maturity stage. In Sonagazi soils the highest content of S was 46 C mol kg-1 which is 33.80% more as compared with control (EC0G0H0). But in Badarkhali soil the highest content of S in wheat was 47.61 C mol kg-1 which is 89.30% more as compared with control (EC0G0H0). The combined application of gypsum 300 kg ha-1 and rice hull 8 t ha-1 significantly (P ≤ 0.05) increased the N, P, K and S content in wheat at maturity as compared with controlled in both saline soils.