TY  - BOOK
AU  - Chunli Li
AU  - Shixiao Yan
TI  - Change of nutrients in rubber plantations in Xishuangbanna
PB  - Proceedings of IRRDB Conference: NR Industry: Responding to Globalization, 7-8 September 2004, Kunming International Convention & Exhibition Center, China. pp.176-182.
KW  - Leaves
KW  - Nutrient
KW  - Rubber tree
KW  - Soil
KW  - Xishuangbanna
N2  - The results of investigation and analysis on the soil and leaves show that the content of soil nutrients drop markedly in rubber plantation in Xishuangbanna. The soil organic matter, total nitrogen, available phosphors and available potassium descend 0.25-1.25 percentage points, 0.023-0.033 percentage points, 1.3 X 10 -6 - 4.2 X 10 -6 and 30 X 10 -6 - 69 X 10 -6, respectively. The value of pH raises 0.1 - 0.7. The contents of Mg, K and N descend 0.10 - 0.20 percentage points. The nutrient level was higher in 1987 than in 1977 because nutrient guiding fertilization at Jinghong Farm, Dongfeng Farm and Mengpeng Farm
ER  -