Chitosan is composed of a group of chitosan oligosaccharides which defend plants from being attacked by creatures, such as weed, virus and insect through activating plant immune responses such as ethylene and phytoalexins production and lignin synthesis. 5% Chitosan is a new generation pesticide, germicide and nematocide with the features of high efficiency, broad spectrum and immune inductive. 1. Developing stronger roots, accelerating the growth of secondary roots and preventing root rot. 2. Enhancing the immunity of crops and their resistance to diseases and adversities. 3. Promoting earlier maturity of the crops and prolonging the crops? freshness and storage period if spraying this product before harvesting. 4. Increasing yield and improving quality. 5. It contains bio-active marine organism, which is non-toxic, non-residue and pollution free.