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Title: Effects of Pruning Time, Lungs, and Resting Period on Total Non-Structural Carbohydrate Reserves, Regrowth and Yield of Tea. (Camellia sinensis (L.) O. Kuntze)
Authors: Bore, John Kipkoech
Keywords: Pruning Time, --Lungs -- Resting Period -- Non-Structural Carbohydrate Reserves -- Yield Of Tea
Issue Date: Oct-2001
Publisher: Egerton University
Abstract: Two experiments were conducted at Kipkebe Estate, Sotik, Kenya, which lies at 1740 m asl. The experiments were aimed at establishing the effects of pruning time, number of lungs, resting period and total non- structural carbohydrate (TNC) reserves on regrowth and yield of tea. ln the first experiment, tea was lung pruned to leave 0, 4 and 8 lungs, while in the second experiment, tea was rested for O, 45 and 90 days before pruning. Parameters assessed included regrowth period, diebacks, emerging buds, TNC and yields after pruning. Results of the first experiment showed that, TNC was significantly (P 5 0.05) affected by pruning time and number of lungs. October-pruned tea had the highest leaf TNC that ranged from 148 to 300 g/kg. Stem TNC were, however, lower and ranged between 60 and 90 g/kg, in tea pruned in March and October, respectively. Root TNC was higher than both leaf and stem TNC, but it declined immediately after pruning, and reached pre-pruning level after 3 months. There was no significant effect of pruning time and number of lungs on both diebacks and emerging buds. The October-pruned tea bushes of the 1997 harvests had the highest significant yields, followed by June-pruned, and lastly, by March-pruned tea bushes. There were significant correlations between leaf TNC and regrowth period (r = -0.61), root TNC and regrowth period (r = -0.52), stem TNC and diebacks (r = 0.46), stem TNC and emerging buds (r = -0.54), leaf TNC and yields (r = 0.39), stem TNC and yields (r = -0.57), and root TNC and yields (r = 0.62). However, r-values for root TNC and the assessed parameters were higher than for other TNC’s and the assessed parameters. In experiment two, October pruning increased leaf, stem, and root TNC. A longer resting period of 90 days improved leaf and root TNC to 294 and 230 g/kg, respectively. Generally, TNC declined after pruning and thereafter increased to non-significant levels. Resting for 90 days also reduced regrowth period to 100 days. Pruning in October produced higher amounts of diebacks and highest yields. Pruning time significantly increased yields during the pruning year, the following year and cumulative yields. Root TNC significantly (P 5 0.05) correlated with regrowth period (r = — 0.39). Leaf and root TNC were positively correlated with diebacks (r = 0.48 and 0.91, respectively). Leaf, and root TNC correlated significantly with yield (r = 0.54, and r = 0.83, respectively). Generally, the best number of lungs, resting period, and pruning time is between 4 and 8 lungs, 45 and 90 days, and October, if drought stress can be avoided, respectively.
Appears in Collections:Faculty of Agriculture

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