Experimental Study on Pricking Hole Performances of Deep Application Liquid Fertilizer Device

In order to meet the needs of different spacing and depth of intertillage crops, a kind of liquid fertilizer device which can apply liquid fertilizer deeply into the soil was designed. Rotational speed of planetary frame, forward speed of test-bed vehicle, the distance between rotating center of planetary wheel axle and spraying fertilizer needle-tip were selected as factors, experiment was designed using quadratic orthogonal-rotation combination, then the influence law of the interaction of various factors on the distance between holes and the depth into the soil were analyzed using response surface method. The optimum factors are obtained under good operating conditions: the forward speed of test-bed vehicle is 0.56m/s, the distance between rotating center of planetary wheel axle and spraying fertilizer needle-tip is 285mm, at this time, the distance between holes is 220mm, the depth into the soil is 108mm. Verification experiment was carried out according to the optimum factors, experimental results show that the obtained distance between holes can meet the design requirements, and the depth into the soil can achieve the depth requirement.