Sichuan is a great province of China in agricultural manufacture, and the dosage of fertilization in per area preponderated the average level of our nation by 47.76%.

• 四川是我国的农业大省，单位面积化肥施用量超出全国平均水平47.；76%25，大量及不合理的施用化肥，打破了农田生态系统的养分平衡。