000			01385nam a2200145Ia 4500
008			220216s9999 xx 000 0 und d
100			_aSamarappuli Lalani
245		0	_aSoil management practices in rubber plantations and their effects on the environment
260			_bBulletin of the Rubber Research Institute of Sri Lanka _c1997
300			_a18-Jul
520			_aRubber plantations were first established in Sri Lanka at the beginning of the century. Since then many individual plantations have undergone three planting cycles of approximately 30 years per cycle without any great adverse effect on the natural environment. In the mean time the commercial yields of rubber have risen from about 250 kg per ha. to the present level of the modern high yielding trees of approximately 1500 kg per ha. a six fold increase. Rubber cultivation involves soil management practices designed to protect the soil from erosion and preserve its fertility. While conservation measures are being pursued to minimize deterioration and thereby maintain the native soil fertility. Other agronomic practices simultaneously sustain high crop performance through soil nutrient enrichment. From the time of planting to replanting the rubber plantations present and environmentally acceptable replacement for the native forest.
650			_aRubber plantations
700			_aYogaratnam N
942			_cJS
999			_c68846 _d68846