The representative research locations were Karang Jaya and Muara Rupit Sub Districts in Musi Rawas
Regency for dry land oil palm plantations, and Banyuasin III and Talang kelapa Sub Districs in Banyuasin
Regency for the wet land plantations. Since each farmers on average cultivates 2 hectares plantation
uniformly, from each regency were selected 30 farmers using multistage sampling method.