One is mainly used for the development of green agriculture. It can produce more and better pollution-free green food by using it in conjunction with farmyard fertilizers and other small amounts of biological pesticides without or with less use of chemical fertilizers or chemical pesticides. The new-generation ultra-efficient marine bio-medicine fertilizer shell sugar plant disease resistance agent “water spirit spirit†was successfully developed in Dalian. On July 22, 2003, this high-tech achievement was formally approved by scientific and technological achievements organized by Dalian City. “Shuilinglingâ€, a plant disease-resistant and disease-promoting agent of chitosylamine, is a chitosan extracted from shells of sea crabs and shrimps. It is an oligomeric substance obtained through bio-enzymatic degradation. Its mechanism of action is completely different from that of traditional medicinal fertilizers. It is development. The leading products of green agriculture in the 21st century, Japan, the United States, Europe and other developed countries are currently promoting the use. It has significant effects in improving the soil, improving the disease resistance of crops, promoting the growth of crops, and increasing the yield, especially the quality of agricultural products. And it is non-toxic, harmless and non-polluting to humans, livestock, natural enemies of pests and the environment. After being used for vegetable and fruit cultivation, the yield can be increased by 13% to 24%, the nutrient content can be increased by 4% to 19%, the preservation period can be extended by 1-3 times, and the pesticide residue can be reduced to zero. The experts all agreed that this achievement ranks the leading domestic level in terms of technical performance, technical indicators, and improving the nutritional quality of agricultural products. In particular, the novel chitosan citrate, a novel chitosan carboxyl derivative, is contained in this product. For the domestic initiative, it fills the domestic gap. At present, this high-tech project has been listed in the 2003 National Spark Program and the national key patent implementation project. After being widely used in production, it has significant economic and social benefits.