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http://dx.doi.org/10.7745/KJSSF.2013.46.2.136

Responses of Tree Growth and Fruit Production of Persimmon after Lowering Height by Heavy Pruning to Fertilization Rates  

Choi, Seong-Tae (Sweet Persimmon Research Institute, Gyeongnam Agricultural Research and Extension Services)
Park, Doo-Sang (Sweet Persimmon Research Institute, Gyeongnam Agricultural Research and Extension Services)
An, Gwang-Hwan (Sweet Persimmon Research Institute, Gyeongnam Agricultural Research and Extension Services)
Kim, Sung-Chul (Sweet Persimmon Research Institute, Gyeongnam Agricultural Research and Extension Services)
Choi, Tae-Min (Sweet Persimmon Research Institute, Gyeongnam Agricultural Research and Extension Services)
Rho, Chi-Woong (Rearch and Development Bureau, Gyeongnam Agricultural Research and Extension Services)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.46, no.2, 2013 , pp. 136-141 More about this Journal
Abstract
Lowering tree height has been a key practice for efficient management of persimmon orchards. This experiment was conducted to assess whether fertilization rates could be reduced after lowering the tree height by heavy pruning. Twelve-year-old 'Uenishiwase' persimmon trees were lowered to 2 m from over 3 m by severe dormant pruning, and then conventional fertilization rate was applied to some trees in April (N 224 g, $P_2O_5$ 172 g, and $K_2O$ 172 g per tree), June (N 112 g and $K_2O$ 99 g per tree), and October (N 112 g and $K_2O$ 99 g per tree). At the same time, 1/3 or 2/3 of the conventional rate and none were applied to other trees, respectively. Non-application decreased shoot length and reduced number of unnecessary secondary shoots by 39% compared with the conventional rate, not affecting yield and weight, color, firmness, and soluble solids of fruits. No significant difference was also found in the yield and the fruit characteristics among the trees fertilized with different rates. Concentrations of soluble sugars, starch, N, and K of dormant shoots in March of the following year were not significantly changed by the different treatments of the previous year. There was no significant difference of shoot growth and yield among the treatments the following year when the same fertilization rate was supplied to all the trees. Results indicated that fertilization rate could be reduced to less than 1/3 of conventional rate to save the cost and stabilize shoot vigor when tree height is lowered by severe pruning.
Keywords
Fertilization; Low height tree; Persimmon; Pruning; Tree vigor;
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