The study looked at how soil moisture varies over time and space on the Loess Plateau in China. Researchers used a method called Kriging to analyze the distribution of soil moisture on a slope in the Caijiachuan watershed. They found that soil moisture in the top 30 cm of soil was lower in April but higher in August compared to the deeper 30-60 cm layer. Overall, soil moisture levels were enough for plant growth in the beginning, but more water was needed as plants grew.