SAP used in agriculture, commonly known as " aquasorb "，It is a new type of functional polymer material, such absorbent material contains a large number of strong water absorbent groups, the structure-specific, the inside of the resin can infiltration within the association engage in co-operation and absorbent water through its meshes. Its maximum suction force of up to 13-14KG / square centimeter, can absorb and maintain hundreds of times its own weight of pure water, and these stored in aquasorb provide water for crops, fruit trees, vegetables, flowers, trees, etc. and the roots of plants can directly absorpt (suction force of tree roots 17-18KG / square centimeter). This feature prospects for in the broad in the drought-resistant water-saving agriculture, forestry. As a result of the different types of super absorbent polymer materials, different making methods, varieties, make up a large family of aquasorb, and different names: such as super-absorbent polymer, super-strength water-absorbing resin, soil moisture aquasorb, high water-absorbent aquasorb, aquasorb for drought, the French call it "water and soil," the British called it "plastic sand," etc. Because of the significant water absorption characteristics, and extensively used in industry, health and agriculture, forestry, etc. Northern part of the U.S. Department of Agriculture Research Center in the mid-seventies,first developed, the aquasorb for corn and soybean seed coating field experiment, obtaining good results, has promoted in the western United States . In the world except the U.S., Japan, France, Britain, Belgium, the former Soviet Union and some Middle East countries have a test and application, and obtained good results. Chinaese aquasorb research and production is beginning in the early eighties, though a late start, but developed quickly . And in agriculture and forestry has carried out extensive experimental research and has yielded gratifying results.