Response of grapevine rootstocks to different aluminium saturation levels in soil

Abstract

The objective of this work was to settle a differentiated tolerance of grapevine rootstocks to exchangeable aluminium of soil through levels of aluminium saturation. The experiment was conducted in a greenhouse with samples of Cambissol Húmico soil (zoning unity Farroupilha). The rootstocks tested were: R-99, 196-17 Cl, Kober 5 BB, Rupestris du Lot and the cultivar Isabel (Vitis labrusca L.), in aluminium saturation levels of 0.0%, 8.18%, 14.01%, 22.18%, 47.28% and 67.54%. The variables evaluated were: plant height, length of roots, dry weight of leaves, stems and roots, and concentration of phosphorus, potassium, calcium and magnesium in leaves and roots. A saturation level until 14.01% did not interfere for the most of variables evaluated. The results show that: in relation to the length of roots, cultivar Isabel increased even in high levels of aluminium saturation, while Rupestris du Lot and 196-17 Cl had the highest reductions; on aerial portion, Isabel and 196-17 Cl appear as the most efficient, and R--99 as the least efficient for phosphorus accumulation; concerning this variable, Kober 5 BB showed a more regular performance; potassium suffered less interference under aluminium presence, still having increased on aerial portion; magnesium had the highest reduction level on aerial portion, while calcium had the lowest accumulation in roots. In a general evaluation the differentiated tolerance was as follows: R-99 = Isabel > Kober 5 BB > Rupestris du Lot > 196-17 Cl.