It is not easy to plant tomatoes well. When we plant tomatoes, a large number of dead trees often appear after colonization. The main reasons for this phenomenon are: ① infection with soil borne diseases, such as root rot and stem base rot. ② The use of farm manure that is not completely decomposed will lead to burning seedlings and dead trees. Therefore, in order to obtain high-yield and high-quality tomatoes, we must control the number of soil harmful microorganisms and maintain good physical and chemical properties of soil.

Chitosan oligosaccharide fertilizer is rich in active bacteria, which can effectively curb the propagation of harmful microorganisms and prevent the occurrence of soil borne diseases. At the same time, it can loosen the soil, improve the soil aggregate structure, cooperate with seaweed fertilizer, effectively promote the absorption of nutrients by crops and improve the stress resistance of crops.