Effect of salinity level and manure dose on the release of nutrients into water from brackishwater soil.

Abstract

Laboratory experiment was conducted wi~li cattle manure @ 1% and 2% and chicken manure @ 0.3% and 0.6%, respectively to study the changes in hydrological characteristics and nutrient concentration in brackishwater soil and water phase at different saiiniq levels (10,20 and 30 ppt) for 37 days. Higher amounts of carbondioxide were registered with cartle manure both at 1% and 251 at ail salinity levels. All marlure treatments resulted in depletion of dissolved oxygen after application. hmonical nitrogen content in water was higher than nitrate nitrogen on ail day of incubation and at all salinity levels. .bailable nitrogen in water increased substantially with the progress of incubation. Chicken manure @ 0.6% resulted in higher amounts of available nitrogen and phospi~orus release into water at 20 and (10ppt salinit): respectively, h4anure treatments registered increase in organic carbon, available nitrogen and phosphorus in soil as compared to initial values. Lower dose of manures (cattle manure 1% and chicken manure 0.Yk) also resulted in favourable soil and water c2iaracteristics