Abstract
Abstract The moisture and the concentration of K in the soil in plant ecological park was accurately controlled based on the SIMATIC S7-300 PLC controller. The hardware of control system based on PLC was set up, at the same time, the control algorithm used in the moisture and concentration of K was analyzed and the software design of control system was also completed. At last, the control system was proved to be practicality and superiority by comparing the quantity and quality of potatoes yield from the two plots, one is controlled by the designed controller and the other is in the natural growth.
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