FUZZY LOGIC BASED AUTOMATIC PLANT WATERING SYSTEM

In this thesis, design of fuzzy logic based automatic plant watering system for the crop maize is proposed. The health of a plant or crop is influenced by many factors; like wind speed and direction, radiation, temperature and humidity and so on. The plant watering requirement for any crop is the amount of water that must be applied to meet the crop's evapotranspiration (ET) needs. The longer the growth period of the crop is the higher the water requirement. The dry moisture value is also the higher water requirement. Due to this, automatic plant watering system is the best solution for managing of water and to increase the production rate of the crop. Automatic plant watering system was done based on Fuzzy logic controller, which has three input parameters and one output parameter. The input parameters are moisture value of the soil (with range of 0 to 100%), evapotranspiration difference (with range of -10 to 10 mm/day) and month after sowing of the crop (with range of 0 to 140 day). The output parameters is the duration of valve opening (with range of 0 minute to 30 minute). Penman-Monteith equation is used to compute the actual evapotranspiration of the specific crop from climate conditions. The difference between actual (calculated) evapotranspiration and the desired evapotranspiration is one of the input parameter for the fuzzy interface system. The evapotranspiration estimation has four input variables. These are humidity, temperature, radiation and wind speed. The duration of valve opening is gradually increased with the decreasing of Moisture value, mid-season of the crop sowing period and the decreasing of evapotranspiration difference. When the evapotranspiration difference is highly negative, the moisture value of the soil is dry and the month after sowing of the crop is in mid stage, the duration of valve opening was very long. And also when the evapotranspiration difference is highly positive, the moisture value of the soil is wet and the month after sowing of the crop is in initial stage and late ...