000			01205nam a2200181Ia 4500
008			220216s9999 xx 000 0 und d
100			_aChunli Li
245		0	_aChange of nutrients in rubber plantations in Xishuangbanna
260			_bProceedings of IRRDB Conference: NR Industry: Responding to Globalization, 7-8 September 2004, Kunming International Convention & Exhibition Center, China. pp.176-182.
520			_aThe 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.
650			_aLeaves
650			_aNutrient
650			_aRubber tree
650			_aSoil
650			_aXishuangbanna
700			_aShixiao Yan
942			_cJS
999			_c55307 _d55307