Survey data samples used for this study was carried out by the method of stratified random sampling from three (03) Black pepper growing districts in Dong Nai Province, including Cam My, Tan Phu district and Trang Bom district. This is an area of 3 districts of black pepper large crop land in Dong Nai province (table 3.1) and three districts also represent three different areas of soil and belong to three different directions in Dong Nai province. According to the Department of Agriculture and Rural Development in Dong Nai Tan Phu District, located to the east - north, gray mixed laterite soil type; Cam My district is located to the west - south, basaltic soil type; Trang Bom district located to the west - south, nasty brown laterite soil types and a small portion of land area is basaltic sand shot.
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