The researchers used a computer program to study how water moves through soil and how plants absorb water. They planted grass in containers with the same soil and measured the soil moisture and drainage water over 81 days. They found that the accuracy of predicting drainage water decreased with higher soil water levels. The plant absorbed the most water in the third growth stage without any stress. The soil moisture decreased more in the top 40 cm after watering, showing that the roots absorbed more water from that depth. Gypsum blocks at 5 cm depth were the most accurate in measuring soil water content.