Design and application of soil layered fertilization machine for facility vegetable root zone

In agricultural production, chemical fertilizers play an irreplaceable role, but their excessive application is one of important reasons for worsening problem of agricultural non-point source pollution．A mechanized technology and equipment for layered fertilization in root zone of facility vegetables was studied and tested．Application of this technology and equipment can meet working conditions of greenhouse narrow spaces．Design of a Y-shaped rotary tiller could better break through soil, and depth of rotary tillage could reach more than 20 cm．At the same time, a layered fertilization mechanism could be designed to form a cylindrical fertilizer area in soil cultivation layer of 3 to18 cm, effectively reducing amount of fertilizer used in facility vegetable cultivation, avoiding impact of side fertilization and crop root fertilization on vegetable root growth, and ensuring continuous supply of fertilizer to plants nearby, improving fertilizer efficiency, and achieving goal of reducing application and increasing efficiency．This machine has been tested and demonstrated in cultivation of green radish, with a 54.3% improvement in spraying efficiency compared to traditional manual operations, a 37.8% reduction in fertilizer usage, and a slight increase in green radish yield and nutrient content．