Phosphorus (P) is an essential element for plant growth. It also is a key element for eutrophication of water bodies. The loss of P from agricultural soils not only leads to a decrease in the utilization ratio of fertilizers and an increase in the cost of agricultural production,but also gives rise to the eutrophication of surface water and ground water. Eutrophication, caused by P enrichment, first came to the fore in the 1960s, most notably in the Great Lakes region of the USA and Canada. In the following...