EFFECT OF POTASSIUM SULPHATE AND VINE LOAD ON THE GROWTH AND YIELD OF THOMPSON SEEDLESS GRAPEVINES WITH A SPECIAL REFERENCE TO THE OCCURRENCE OF CLUSTER TIP DESICCATION PROBLEM | ||
| Journal of Plant Production | ||
| Article 9, Volume 29, Issue 8, August 2004, Pages 4711-4728 PDF (4.82 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2004.238789 | ||
| Author | ||
| M. M. Shoeib, | ||
| Viticulture dept. Hort. Res. Instit. Agric. Res. Centre, Giza, Egypt. | ||
| Abstract | ||
| This study was conducted during 2000 and 2001 seasons to examine the effect of vine load (72, 96, or 108 buds I vine) and potassium sulphate ( 0.0, 100, 200 and 300 kgl fed) on growth, percentages of N, P, K and Mg, total and marketable yield, cluster tip desiccation %, harvest date as well as some physical and chemical characters of the berries and wood ripening of Thompson seedless grapevines. Results showed that increasing vine load levels from 72 to 108 budsl vine was followed by a gradual reduction in leaf area, main shoot length, percentages of N, P, K and Mg , berry weight, total soluble solids % and wood ripening, meanwhile it was responsible for increasing total yield slightly, cluster tip desiccation % and total acidity %. Harvesting date was delayed in response to raising vine load levels. Increasing potassium sulphate levels was accompanied by increasing the investigated characters except percentages of P, K and Mg, cluster tip Desiccation % and total acidity % . In most cases meaningless effect was detected in the studied characters between the application of 200 and 300 kg potassium sulphate Ifed. The positive action of increasing potassium sulphate and the negative influence of increasing vine load on raising cluster tip desiccation % were ensured. For checking cluster tip dryness % and improving yield and quality of Thompson seedless grapes, it is recommended to leave 96 buds I vine and fertilize the vines with 200 kg potassium sulphatel fed. | ||
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