Download or read book The Effect of Rootstock on the Performance of the Vitis Vinifera Cultivars Pinot Noir, Chardonnay, Pinot Gris and Merlot written by Raymond Glen Shaffer and published by . This book was released on 2002 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study reports finding of two rootstock experiments planted in 1997. The purpose of the first experiment was to evaluate the performance of Pinot noir on 19 phylloxera-resistant rootstocks and as an ungrafted vine. The purpose of the second experiment was to evaluate the performance of V. Vinifera cultivars Pinot noir, Chardonnay, Pinot gris and Merlot grafted to nine phylloxera-resistant rootstock, and as ungrafted vines. Data for both experiments were collected in 2000 and 2001, the fourth and fifth years of establishment respectively. Vines received supplemental irrigation and were fertilized with N-P-K during both seasons. In the first experiment, rootstock affected vegetative growth, chlorophyll content, yield, cluster weight and berry weight in both years, gas exchange measurements in 2000, and fruit composition in 2001. Of the V. riparia x V. rupestris rootstocks, 3309C and Schwarzmann imparted low to moderate vigor, as reflected by pruning weight. 101-14 Mgt imparted higher vigor to Pinot noir than 3309C. Based on ripening index values (soluble solids/titratable acidity, Brix/TA), ripening appeared to be earlier for vines grafted to 101-14 Mgt and Schwarzmann than for 3309C. The V. berfandieri x V. riparia rootstocks, including 161-49C and 420A, imparted average to higher than average vigor. Ripening appeared to be later than average and berries larger than average for vines grafted to these rootstocks. With the exception of 110R, the V. berlandieri x V. rupestris rootstocks had higher than average vigor. Ripening times seemed to be average and berry weights were higher than average for vines grafted to these rootstocks. Of the remaining-rootstocks 1616C performed much like the V. berlandieri x V. rupestris rootstocks with an even higher ripening index. Borner, Riparia Gloire, 44-53 Malegue and Gravesac all imparted low to moderate vigor. Berry weights tended to be average to lower than average. Riparia Gloire and Gravesac seemed to impart earlier ripening, while Borner and 44-53 Malegue did not. In the second experiment, the V. berlandieri x V. riparia rootstocks imparted more vigor, a higher yield, a higher berry weight and delayed ripening as reflected by the ripening index. 101-14 Mgt imparted a higher pruning weight, lower berry weight and earlier ripening than 3309C. 110R, 44-53 Malegue and Gravesac conferred moderate vigor as reflected by pruning weight. Riparia Gloire conferred lower vigor. Ripening times imparted by these rootstocks ranged from early for Riparia Gloire and Gravesac, to average for 110R and later for 44-53 Malegue. Berry weights were average for scion grafted to 110R and Gravesac, and low for scion grafted to Riparia Gloire and 44-53 Malegue.