000			01322nam a2200205Ia 4500
008			220216s9999 xx 000 0 und d
100			_aFerreira M
245		0	_aCharacterisation of natural rubber clones using standard methods
260			_bNatural Polymers and Composites.Conference proceedings Sao Pedro, Brazil, 14th-17th May 2000, p47-50
500			_aSource Year: 2001
520			_aThe latex and NR from rubber trees from the region of Presidente Prudente, state of Sao Paulo, Brazil, are characterised, with the clones RRIM 600, IAN 873, GT 1 and PB 252 investigated in two different tapping systems. The parameters studied are dry rubber content (DRC) and percentage of ashes and of nitrogen. The rubber properties vary considerably as a function of clone type, tapping method and year season. DRC tends to decrease in the begining of the dry, cold season (May and June), whereas both;nitrogen and;ashes increase in the same period. One hypothesis is that climate conditions favour the fall of tree leaves and decrease of photosynthesis, thus causing the plant nutrients to be directed to the latex.
650			_aNatural rubber
650			_aRubber clones
700			_aGoncalves P S
700			_aMattoso L H C
700			_aMoreno R M B
700			_aRogirio M B
856			_uRAPRA
942			_cJS
999			_c55366 _d55366