Abstract This is a research, education and development. The fill control systems chemical agriculture. For wet rice cultivation with a dry-switching techniques. The objective is to enhance the productivity of agricultural work, in particular the design and construction of the control system of agricultural chemicals and populate using a meter to measure NPK nutrients in soil by using sensors measure the level of water in order to get the value of a plant needs nutrients properly. By controlling the operation of the meter, moisture and the microcontroller (STM34F4) in order to control can be done manually.Keywords: performance, production control systems Measurement of nutrients The demand for nutrients
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