Studies on Pruning Severity on Productivity of Grape (Vitis vinifera L.) Variety Muscat Hamburg

A field experiment on standardization of pruning practices for different cropping patterns of grapes (Vitis vinifera L.) on Muscat Hamburg and Thompson Seedless varieties was undertaken during the period from 2013–2014 at farmer's field, located at Kamayagoundanpatty, Cumbum Valley of Theni district in Tamil Nadu. Double pruning and double cropping system was adopted during winter (December) and summer season (June) in there varieties respectively. The pruning treatment three times with five vines per replication in randomized black design. Eleven treatments were imposed on ten year old uniform sized grape vine grown under a spacing of 3 x 2 m. The treatments are spur pruning 1–2 bud level in June and forward pruning in December, Spur pruning 1–2 bud level in December and forward pruning in June, spur pruning 3–4 bud level in June and forward pruning in December, spur pruning 3–4 bud level in December and forward pruning in June, spur pruning 5–6 bud level in June and forward pruning in December, spur pruning 5–6 bud level in December and forward pruning in June, spur pruning 8–9 bud level in June and forward pruning in December, spur pruning 8–9 bud level in December and forward pruning in June, spur pruning 5–6 bud level in June and cane pruning in December, spur pruning 5–6 bud level in December and cane pruning in June and cane pruning both December and June. The highest number of canes per vine was recorded in T₂ (44.03) in winter pruning. In summer pruning, the highest number of canes per vine was recorded in T₁ (48.21). The maximum weight of the prunedmaterial was recorded in T₂ and T₁ (1.62 and 2.23 kg vine⁻¹) during winter and summer pruning. The treatment T₂ (5.53 cm) recorded the maximum internodal length was recorded and was on par with T₄ in winter pruning. In summer pruning, the maximum internodal length was recorded in T₁ (6.17 cm). The treatments T₈ (51.02) registered the maximum number of bunches per vine in winter pruning. In summer pruning, T₇ (55.10) treatment recorded the maximum number of bunch per vine.