Abstract
An small deep-placement fertilizer applicator (SDFA), to realize hill fertilization application and mark fertilizer location with lime, was developed. It’s unique structure and working principle were detailed. Orthogonal tests was conducted by the software EDEM virtual simulation in order get the working parameters and structure of the applicator. The rotational torque was much higher than resistant torque after optimization design. Field testing across different sites and seasons showed that the improved applicator consistently placed synthetic fertilizer at the depth of 18–21 cm and plant spacing of 49–52 cm. The average amount of fertilizer released into each hill was 54.5 g when the set amount was 55.0 g, which indicate the design are effective.
