Understanding of acquisition strategies of the soil accumulated phosphorus by various crops for low input production technology

在集约化施肥制度下，土壤中大量的磷源以有机磷(植酸)和不溶性磷(Al-、Fe、Ca-P)的形式积累和固定。应确定作物溶解和吸收土壤磷的潜力，以便在这些农地上建立可持续的作物生产力。在本研究中，我们展示了在玉米、花生和田菁等几种作物中获得这些P化合物的可能性，并评估了与根瘤菌相关的豆科作物作为绿肥对后茬作物的P和N供应潜力。

Under an intensive fertilization system in the arable lands, a great amount of P sources has been accumulated and fixed in the soil as an organic P (phytin) and insoluble P as Al-, Feand Ca-P. The potential of crop to solubilize and absorb the soil P should be defined in order to establish the sustainable crop productivity in these agricultural lands. In the present study, we showed possibility of acquisition of these P compounds in several crops such as corn, peanut and sesbania and also evaluated the P and N supply potentials of leguminous crops associated with rhizobia as green manures to the succeeding crop.