Rock-phosphate mobilization induced by the alkaline uptake pattern of legumes utilizing symbiotically fixed nitrogen

摘要: Soybean and alfalfa were grown on sand soil to which P was added in the form of finely ground rock phosphates. When legumes depended NO3 as N source, more anionic than cationic nutrients absorbed. This resulted a pH increase growth medium very low availability phosphate. When, however, made use symbiotically fixed N, absorbed leading an acidification ensuing mobilization higher Symbiotic fixation initiates chain reactions increased phosphate-P is dependent photosynthate supply Therefore, separate experiment it investigated whether priming effect exerted by small quantity easily soluble phosphate, could enhance legumes. Results obtained indicated that phosphate might indeed be effective this respect.