Abstract:
Water is an important factor in planting. The decreasing amount of water in nature is one of the important problems in the future. Giving the appropriate amount of water for planting should be realized and managed. Watering different kind of plant are difference, we must concern about how much water plant needed according to transpiration and photosynthesis and also the evaporation of water from soils. The loss of water in evaporation and transpiration cause from many factors such as temperature, humidity, wind speed, etc. This thesis presents a mathematical model of the relationship between water usage and environmental factors which are air temperature, relative humidity, and total of soybeans leaf area under a relative error of less than 10 percent. The model can direct the amount of water given to soybean (Glycine max (L.) Merrill) and help the water management for soybean vegetation.