A control system for the mechanism of feitilizer proportioning and mixing based on the nitrogen, phosphate and potassium fertilizer

The precision agriculture is the direction of the future modern agriculture. The efficient use of fertilizers is the key technology in the field of the precision agriculture. This technology needs the information of the crop need and the soil fertility to carry out the variable fertilization. Thus it needs to develop a mechanism of fertilizer proportioning and mixing to proportion the three kinds of fertilizer: nitrogen, phosphate, potassium. This paper discussed the control system of the mechanism. The main task is to realize the proportioning function through adjusting the speed of the discharging shafts according to the soil fertility, the speed of the tractor and other information. The control system is consisted of two important parts: the human-machine interface and the step motor controller. A control system is developed to proportion the nitrogen, phosphate and potassium fertilizer based on the SCM and Serial communication technology. This system is low-cost and easy to operate.