SUMMER PRUNING AND FOLIAR APPLICATION WITH Fe, Zn and Mn FOR THOMPSON SEEDLESS GRAPEVINES | ||
| Journal of Plant Production | ||
| Article 14, Volume 29, Issue 12, December 2004, Pages 7177-7189 PDF (2.9 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2004.238953 | ||
| Author | ||
| A. H. Omar, | ||
| Viticultural Research Dept., Hort. Res. lnat., Agric. Res. Center, Giza, Egypt. | ||
| Abstract | ||
| During two successive years 2001 and 2002 Thompson Seedless grapevines were subjected to summer pruning practices (head suckering + pinching the main shoots and topping the laterals) and mineral nutrition of chelated Fe, Zn and Mn together at 0.1 % each, applied after head suckering; 10 days before anthesis and after fruit set (at 3mm berry diameter). The vines received one, two or three sprays of Fe + Zn + Mn according to the time of spraying. The number of treatments was ten. Shoot growth rate was in April> in May> in June> in July. All treatments increased shoot growth rate compared with the control. Carbohydrate content of the cane was higher in February then decreased in March and April. The content remained almost unchanged from April to August. Carbohydrate content of the shoot increased progressively. Spraying Fe, Zn and Mn + summer pruning increased carbohydrate content in canes; shoots and new canes, especially when applied 10 days before anthesis. Bunch weight, yield, TSS, Fe. Zn and Mn were increased, whereas acidity was decreased. The number of clusters/vine was not affected in the year of application. However, it was significantly increased in the following season. The results indicated that one spray of Fe + Zn + Mn at 0.1 % each 10 days before anthpc:k; .,. summer pruning seemed to be sufficient and reduced mineral nutrition costs by about 50% at least. | ||
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