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Abdel Hameed M. Wassel

The present investigation was carried out during 1994 and 1995 seasons on `Roomy Red' grape vines cultivated in Minia and Beni Suef governates to study the effect of Dormex and/or overcropping on `Roomy Red' grape vines. Bud opening, number of clusters per vine, as well as the yield and its physical and chemical properties, were studied. Results indicated that Dormex overcame the irregularity of bud opening. At the same time, bud opening preceded the control by about 4 weeks. The percentage of bud opening, fruit set, as well as the number of clusters per vine, were increased. On the other hand, over-cropping had a vice versa effect on the previous parameters as compared with the control. Results also indicated that onion was of less effect than berseem in this concern.

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Eric T. Stafne, B. Dean McCraw, William G. McGlynn, and R. Keith Striegler

Rootstocks can offer benefits such as pest resistance, tolerance of certain soil characteristics and tolerance of salts and salinity. The objective of this study was to determine if `Cabernet Franc' grafted onto various rootstocks differed in a number of measured yield and quality variables. The plots consisted of Clone 1 `Cabernet Franc' with four different rootstocks: 1103 Paulsen, 140 Ruggeri, 3309 Couderc, and St. George. Rootstock did not have much effect on the yield or quality of fruit produced by `Cabernet Franc'. Although not significantly different, the overall yield of 3309C appears to be lower than the other rootstocks. With further data, it might be possible to identify annual climate patterns that favor one rootstock over another with respect to certain quality attributes. One particular problem with `Cabernet Franc' in Oklahoma is its tendency to overbear, thus resulting in uneven ripening.

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David A. Grantz and Larry E. Williams

Leaf area development and canopy structure are important characteristics affecting yield and fruit quality of grapevines. Trellising systems and wide row spacing are common viticultural practices that violate key assumptions of currently available indirect methods of leaf area determination. We have developed a protocol for using a commercially available instrument to determine leaf area index (LAI) indirectly in a trellised vineyard. From knowledge of plant spacing, leaf area per vine can be calculated as required. A derived calibration equation resulted in a near 1:1 relationship (y = 0.00 + 1.00 X; r2 = 0.998) between actual and indirectly determined LAI over a range of LAI induced by irrigation treatments. The protocol involved covering 75% of the sensor with a manufacturer-supplied field of view delimiter and masking data from the outer three (of five) concentric radiation sensors. The protocol could form the basis for a general measurement technique, but may require local calibration.

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Fengyun Zhao, Junli Sun, Songlin Yu, Huaifeng Liu, and Kun Yu

Aeration through subsurface drip irrigation (SDI) can promote plant growth and increase crop yield; however, more research is focused on annual crops, and there are few studies on perennial crops. We have studied a new type of SDI (SDI with tanks) suitable for cultivation and production of perennial fruit trees and photovoltaic aeration device in greenhouse. The results showed that aeration irrigation promoted the growth of new leaves, fine roots, and new branches of grape, regulated O2/CO2 content in rhizosphere soil, and accelerated air exchange in rhizosphere soil. This study showed that aeration irrigation did not change the structure of bacteria and fungi but significantly increased the abundance of aerobic bacteria, such as Nitrospira and Cytophagia. Moreover, it promoted the increase of Pseudomonas and Aspergillus related to phosphate solubilization, that of Bacillus related to potassium solubilization, and that of Fusarium related to organic matter (OM) decomposition. This study shows that aeration irrigation through SDI with tanks can promote grape growth, which may be related to the ability of aeration irrigation to change the gas composition of rhizosphere soil, optimize the structure of rhizosphere soil microorganism.

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Krista Shellie, Jacob Cragin, and Marcelo Serpe

Idaho’s economy: Agribusiness and tourism impacts J. Agribusiness 25 77 91 Fuller, M.P. Telli, G. 1999 An investigation of the frost hardiness of grapevine ( Vitis vinifera ) during bud break Ann. Appl. Biol. 135 589 595 Gillerman, V.S. Wilkins, D

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Krista C. Shellie

New vineyard regions are being tested and established throughout North America in climatic zones once considered marginal or unsuitable for growing grapes of European origin ( Vitis vinifera ) for wine production ( Evans et al., 2005 ; Hamman, 1993

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Julie M. Tarara and Jorge E. Perez Peña

. Springer, New York, NY de Souza, C.R. Maroco, J.P. dos Santos, T.P. Rodrigues, M.L. Lopes, C.M. Pereira, J.S. Chaves, M.M. 2003 Partial rootzone drying: Regulation of stomatal aperture and carbon assimilation in field-grown grapevines ( Vitis vinifera cv

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Kazuya Koyama and Nami Goto-Yamamoto

Analysis of the expression of anthocyanin pathway genes in developing Vitis vinifera L. cv Shiraz grape berries and the implications for pathway regulation Plant Physiol. 111 1059 1066 Castellarin, S.D. Gaspero, G

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Bhaskar Bondada and Markus Keller

histochemical changes in grape seeds from Vitis vinifera L. cv Cabernet franc during fruit development J. Agr. Food Chem. 54 9206 9215 Castellarin, S.D. Gambetta, G.A. Wada, W. Shackel, K.A. Matthews, M.A. 2011 Fruit ripening in Vitis vinifera

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Bryan Hed and Michela Centinari

composition of Tempranillo grapes Amer. J. Enol. Viticult. 63 367 376 Diago, M.P. Vilanova, M. Tardaguila, J. 2010 Effects of timing of manual and mechanical early defoliation on the aroma of Vitis vinifera L. Tempranillo wine Amer. J. Enol. Viticult. 61 382