Question

Compare phosporous fixation by Iron and Calcium. Which fixes P more tightly? Why do you think this is so?

Answer 1

Answer, Phosphorus fixation Plants take phosphorus only from soil solution. Hence, phosphorus in soil must be replenished. Hence, phosphorus is. (pesced to soil, by The Metal ion ions of Iron, Aluminium, calcium This phenomenon is frown as phosphorus fiscation. . Phosphorus, fixation is pH dependent, Phosphorus fixation depends on the pH of the soil. In acidic medium, more iron and aluminium is available, hence in acidic medium or pH lowey Thon 7 of soil, phosphorus gel- aluminium bonded to Iron and phosphorus to forem insoluble Iron and phosphorus aluminium phosphide respectively. - But, in pH hi slightly greater than 7, ise., in slightly alkaline medium it bound to calcium, to fomm insoluble ealeium phosphide Among Iron and calcium, Iron fines P more til tightly. This is because pH o soil for crop production is generally between 6 to 7. And in audio medium, phosphorus és more with Iron as mentioned before. . And, obviously at this pH, (6 to 7) phosphorus fines to calcium is in lesser or week amount toe om weakly. Note: In acidic medium, calcium phosphide get decomposed.