Keywords: phosphate, nitrates, sodium adsorption ratio, SAR, leachates, cations, leachability, biostimulants, soil-water interface, water pollution, surface water quality, soil micelles, eutrophication
Action of cations on the leachability of bio-stimulants in a soil column at soil-water interface and its impact on surface water quality
Excess of nutrients such as P and N causes eutrophication on the shores of lakes and ponds. Simulated soil column study showed that the physico-chemical properties of soil affects the movement of anions such as PO
1-by the soil pore water thereby affecting the leachability at soil water interface. In the present study, sodium adsorption ratio (SAR) was used as a measure contributing in the swelling of the soil micelles. Two water bodies (sites) were selected for the study coded as RJP and BT located in the district Lucknow UP, India. Different textured soils with a fine sand fraction 0.15 mm of BT soil and 2.0 mm of RJP soil were collected from the shorelines of BT and RJP. The values of SAR was found maximum (15.57) in the soil at the site coded as RJP and minimum on the soil at site BT. More P ions were found in the leachates of BT soil and least in the leachates collected from RJP soil column. The retention time was more in the column system of soil RJP, depending on the sodium ions in the soil. The porosity of soil is largely affected by the cations and their hydrates thereby affecting the downward movement of soil pore water and leachability of the ions from soil to the nearby water bodies.