Abstract
A single severe mechanical pruning done January, 1985, with the following treatments, hand pruned control, hedging, topping and topping and hedging, successfully reduced the alternate bearing of pistachios. The respective alternate bearing indexes are as follows; control, 0.88; hedged, 0.79, topped. 0.55, hedged and topped, 0.36. All treatments produced approximately equal cumulative yield over the 7 year experimental period. However, the most severely pruned trees demonstrated yield loss in the first 2 years after pruning.The severe mechanical pruning, done prior to the low crop year, produced its effects by forcing trees to produce less fruiting wood during the off-crop year. The effects of a single severe mechanical pruning persisted 7 years.
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