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|Authors:||Potadar, Aarapan Pandurang|
|Title:||STUDIES ON THE EFFICACY OF SOME GROWTH SUBSTANCES AND MECHANICAL GIRDLING IN IMPROVING YIELD AND QUALITY OF THOMPSON SEEDLESS VARIETY OF GRAPE (Vitis vinifera, L.)|
|Publisher:||MAHATMA PHULE AGRICULTURAL UNIVERSITY,|
|Abstract:||The present investivation was undertaken during the fruiting season of 1988 at the Mahatma Phule Agricultural University, Rahuri, with a view to test the applications of different growth substances and to findout the right stage of inflorescence development at which applications of growth substances and girdling will be more effective in improving yield and quality of Thompson Seedless grapes. The periment was laid out in a simple Randomised Block Design with twenty eight treatment combinations, comprising of seven treatments including control and four stages of inflorescence development vis. pre-bloom, full- bloom, berry-setting and veraison at which the treatments of oboth growth substances and girdlings were given. The application of N6 bensyl adenine at pre-and full-bloom stages significantly increased the bunch weight, its length and width. The length was significantly increased due to GA3 applications. Particularly 10 ppm GA at pre-bloom stage followed by 100 ppm GA at berry-setting stage. GA applications at berry-setting stage significantly increased berry diameter. The 100-berry-weight was significantly increased due to 8-BA applications at pre-bloom, full-bloom and berry-setting stages. GA applications also were equally effective at full-bloom and berry-setting stages. The 100-berry-volume was significantly increased due to 6-FAP at pre-bloom, full-bloom and berry-setting stages. The specific gravity was significantly increased due to trunk girdling at pre-bloom stage only. The applications of 6-BA and 6-FAP at full-bloom and berry-setting stages significantly reduced the number of berries per cluster as compared to control. The percentage of shot berries was significantly reduced by pre-bloom, full-bloom and veraison stage applications of GA. The percentage of pink berries was significantly reduced by GA application at pre-bloom stage only. Applications of 6-BA at pre-bloom, full-bloom and berry-setting stages and GAS at pre-bloom and full-bloom stages significantly reduced the percentage of water berries. 6A at veraison stage application also substantially reduced this type of berries. The percentage of mummified berries was significantly reduced due to applications of cytokinin compounds and CCC at berry-setting stage only. The number of berries per cm length of cluster was significantly reduced due to G-BA and 6-FAP applications at full-bloom stage only. The tensile strength of berry pedicel was maximum due to applications of GAS at pre-bloom, full-bloom and veraison stages of cluster development. The period required for cluster maturity was significantly reduced both by cane and trunk girdling done both at berry-setting and veraison stages. These treatments induced an earliness of more than a fortnight over control. The TSS contents of berry juice was significantly incresed due to applications 6-FAP, GAS and 6-BA respectively at pre-bloom, berry-setting and veraison stages. The acidity was significantly reduced due to applications of CCC at pre-bloom, full-bloom and veraison stages, 6-FAP at full-bloom statge, GAS at full-bloom stage, cane girdling at berry-setting stage and trunk girdling at veraison stage of cluster developement. The TSS : acid ratio of berry juice was significantly increased due to applications of S-FAP at pre-bloom and berry-setting stages, those of GAS at full-bloom and berry-setting stages, those of CCC at berry-setting and veraison stages respectively. The reducing sugars were significantly increased due to trunk girdling at pre-and full-bloom stages. Similar trends were observed in respet of total sugars. The non-reducing sugars and sugar : acid ratios did not show difinite trends. On the basis of these results, it can be recommended that for increasing yield application of 10 , 20 ppm GA applications followed by trunk girdling should be made at pre-bloom and full-bloom stages of inflorescence development. For reducing the cluster compactness, applications of both 6-BA and 6-FAP at 10 ppm should be made at full-bloom stage. For improving chemcial composition of berry juice GA3 followed by trunk girdling and also the cytokinin compounds were equally effective.|
|Appears in Collections:||Thesis|
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