Development Of The Nutrient Solution System Based On Micro-Controller In Greenhouse Farming

At the beginning of the paper, the author analyzed the state of our nutrient-solution and the one of foreign agriculture. Then the author pointed out many disadvantages of our now experience-based irrigation. After this the author brought forward a control-model of the amount of irrigation crops in a greenhouse need, which is about the relation of the amount of fertilizer and water crops consuming in a greenhouse and the three main environment factors in the greenhouse which effect the quantity of water and fertilizer crops absorb in the corresponding environment: illumination, temperature and humidity. The model based on artificial neural network is fit for distributed control system and the one by mean of multiple linear regression design can be applied to a little independent system controlled by micro-controller. Both models are analyzed and assessed by way of interrelated elements and they can be used to direct the amount of irrigation in practice plant.There is another important work in this paper: the author developed a nutrient-solution system auto-controlled by single-chip computer. The whole work includes supplying-loop engineering, performing - institution selecting and installing, intelligent controller designing, programming and adjusting. The controller is small, easy to fit, a strong capability to resist interfere and low-cost. So the control system is a more economic production for our low-productivity agriculture compared to other control systems such as a industry computer system. All these demonstrate this production is apt to be popularized. So this work is a fresh attempt to bring our agriculture into an advanced stage, which now is relative to be backward on greenhouse control technique, especially on the aspect of nutrient liquid supplying when crops cultivated on tissue.