| Based on collecting 2 637 samples of 0~40 cm soil layer and analyzing contents of theavailable N/P/K, the research was to define nutrient subarea of rubber plantation in Ledong by GIS method. The results indicated that content of available N(AN) had two grades of 4 and 5, available P(AP) had four grades of 3, 4, 5 and 6, available K(AK) had three grades of 4, 5 and 6. The subarea numbers of AN, AP, AK were 2, 4 and 3 respectively. The comprehensive zone of available nutrient included 15 categories, 1 476 subunit, the distribution of every categories being very mass and in favour of regional management of soil nutrients. |
