Effect of Canopy Management Practices during forward Pruning on Berry Development and Photosynthesis in Tas-A-Ganesh Grapes

Effect of canopy manipulation during forward pruning on berry development and photosynthetic parameters was studied in Tas-A-Ganesh grape grafted onto Dogridge rootstock. Canopy manipulation including shoot thinning, leaf removal, shoot thinning with leaf removal, and shoot pinching, was done after forward pruning. Significant differences were observed in yield and quality. Shoot thinning to about 40 shoots per vine, with removal of three basal leaves, resulted in significantly higher yield, followed by that in shoot thinning alone. Lowest yield was recorded in the Control. Leaf removal drastically reduced bunch development affecting berry weight, diameter and length compared to other treatments. Among different canopy manipulation treatments, higher average bunch weight was recorded in shoot thinning plus leaf removal, whereas, lowest bunch weight was recorded with leaf removal alone. At harvest, the amount of total soluble solids in berries was low in leaf removal at pre-bloom stage, but increased in the treatment of shoot thinning with leaf removal, at the same stage. Different canopy manipulation treatments had significant impact on photosynthesis and transpiration rates. Overall results indicated that canopy manipulation practices such as shoot thinning, to retain 40 shoots per vine with or without leaf removal, followed by pinching, can be recommended to grape growers

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Not AvailableA field experiment was conducted during the year 2011-2012 to study the effect of cluster thinning on bunch yield, berry quality and biochemical changes in black seedless local clone of table grape. Crop load level was adjusted to 23, 27, 33, 37, 45 and 50 clusters per vine. Significant differences were observed for all physicochemical parameters except pH. Shoot length was positively correlated (0.98) with the internodal length. Highest bunch weight (673.0 g) was recorded at lowest crop load level (23 clusters per vine) and vice-versa. Highest berry weight (7.89 g) and berry diameter (24.78 mm) was also recorded at lowest crop load level, which resulted into increased in bunch weight. It was observed that the reduction in clusters per vine resulted into increase in total soluble solids in berries. Significant differences were recorded for reducing sugar, total phenols, total proteins and total carbohydrates. The concentration of reducing sugar was reduced with the increase in number of clusters per vine. With the increase in clusters per vine, carbohydrate content in berries was also reduced. Therefore, thinning upto 27 clusters per vine spaced at a distance of 3.0 m x 1.66 m is recommended for better yield, quality and returns to the grape growers.Not Availabl

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Not AvailableA field experiment was conducted during the year 2007-08 to study the effect of bunch thinning on bunch yield, berry quality and biochemical changes in Sharad Seedless table grapes. Crop load level was adjusted to 30, 40, 50, 60, 70, 80 and 90 bunches per vine. Significant differences were observed for all physicochemical and biochemical parameters except shoot diameter, inter nodal length and berry length. Average bunch weight was increased (466.02 g) with the reduction in number of bunches per vine (30 bunches). The same trend was also observed for average berry weight. Highest berry diameter (20.20 mm) was recorded in 30-bunch treatment followed by 19.90mm in 40-bunches per vine treatment whereas with the highest bunches per vine treatment (90-bunches/vine) the berry diameter was reduced to 17.50mm. It was observed that the reduction in bunch load per vine resulted into increase in total soluble solids in berries up to 18.500 Brix. Significant differences were recorded for reducing sugar, total phenols, proteins and total carbohydrate. The carbohydrate concentration was increased with the increase in number of bunches, however, the concentration was more in berries than in the rachis. Reducing sugar and starch was reduced with the increase in bunch load. Negative correlation of yield per vine with average bunch weight and berry weight was recorded. With the increase in number of bunches per vine, the yield per vine was also increased. The source: sink alteration by bunch removal had impact on yield, berry quality, sugar accumulation and berry composition. Considering the berry diameter as main quality parameter and the concentration of carbohydrate content, reducing sugar, starch and in berries and total phenols in the rachis, retention of 50 bunches per vine for the purpose of local market seems to be an ideal one.Not Availabl

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Not AvailableGrape (Vitisvinifera L.) is one of the important fruit crop. Zinc is a micronutrient which plays important role in various metabolic processes in plants. Zinc works as auxin precursor in plants. The effect of zinc application to mothervine of Dog Ridge rootstock was studied in the present experiment. Zinc was applied in concentration of 0, 5.0, 10.0, 15.0 and 20.0 g/ mothervine and its effects were studied on rooting success and establishment. It was found that application of zinc resulted in early bud sprout as well as increase in rooting success in cuttings. It also resulted in better plant growth as well as increased leaf areaNot Availabl

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Not Availablethe highest dry matter content of the roots was observed in Sharad Seedless with the mean value 47.72%. the dry matter of the harvestable organ (bunches) was found maximum in Sharad Seedless (25.73%) as compared to other varietyNot Availabl

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Not AvailableAn experiment to study the shelf life of four table grape varieties was conducted at National Research Centre for Grapes, Pune (M.S.). Grape bunches packing and the cold storage condition for 30 days after pre cooling for 24 hours was according to the export standard. After cold storage, shelf life and other quality parameters were recorded for four days. Lowest physiological loss of weight was recorded in Sharad Seedless followed by Mahadev Seedless. These two varieties also performed better for the quality parameters in terms of bunch weight, 5 berry weight and berry diameter which are favourable for better shelf life. Significant differences were found for the quality parameters except total soluble solids (TSS). Overall, Sharad Seedless and Mahadev Seedless recorded with the lowest per cent of berry fallen and rotting among the four varieties studied.Not Availabl

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Not AvailableThe variations in growth, powdery mildew and anthracnose incidence and biochemical changes in Thompson Seedless grapevines grafted onto Dogridge and 110-R rootstocks in comparision to own rooted grape vines was investigated.Not Availabl

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Not AvailableGrape is one of the major important fruit crops of the country, grown on an area of about 1, 11,000 ha, with an annual production of 12, 35,000 tonnes (Anonymous, 2012). Earlier, vines growing on their own roots performed well since the soil and water condition were good. However, with the onset of problems like soil salinity, bad quality water and shortage of irrigation water due to drought resulted into reduced fruitfulness, thereby reducting yield of table grapes. The health of vine plays an important role in achieving higher fruit yield and better quality. In addition to irrigation, nutrition and sunlight, different means are followed by the grape growers to achieve the fruitfulness of vines.Not Availabl