Abstract: This paper studied the height growth, basal diameter growth, new branch growth, branch diameter growth, leaf area, leaf area index, fruit setting rate, yield per plant, leaf water content, and root water content of 3 years old Zizyphus mauritiana Lam. in the dry and hot valley of Jinsha River under 4 levels of soil moisture content. Principal component analysis (PCA) and R-factor analysis were made to determine the optimal soil moisture condition for Z. mauritiana growth. The results showed that 70%-85% of field capacity was most appropriate, with a compositor value responding to soil moisture being 56.147, followed by 85%-100% and 40%-55% of field capacity, with the compositor value being 41.506 and 34.545, respectively. It was suggested that 70%-85% of field capacity was the most suitable soil moisture content for Z. mauritiana in the dry and hot valley of Jinsha River.

Key words: Alcohol extract from Mikania micrantha, Panonychus citri, Control effect