Effects of Ringing on Yields of Low-Bearing Orange Trees(Citrus Sinensis(L.) Osbeck)

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Abstract
Twelve to 15% of the Shamouti orange trees in Israel, notably those budded on sour orange stock and growing in heavy soil, bear low yields and are of doubtful economic value. Studies have shown that ringing can sometimes double the yields of these trees, as well as those of Washington Navel and Valencia Late oranges. Applications of growth substances, growth retardants and urea did not alter the effect of ringing on yield, which decreased considerably in the second year and was not evident at all two years after treatment. The effects of ringing were greater, the lower the yields of unringed control trees, and the best results were obtained when trees were ringed before the flowers opened. The increase in yield was accompanied by a decreased drop of flowers and fruitlets and was due to an increase in the number of fruits per tree. Individual fruit weight was not affected by ringing.

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