Effects of Some Chemicals on Breaking Bud Dormancy in Japanese Persimmons.
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概要
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The effects of several chemicals on breaking bud dormancy in three Japanese persimmons (<I>Diospyros kaki</I> cv. 'Hiratanenashi, ' 'Saijo, ' 'Fuyu') were examined. Four chemicals were applied to the cuttings of 1-year-old twigs on November 9 and December 8; 1) leaching solution containing 20% lime nitrogen (55% CaCN<SUB>2</SUB>), 2) 1/2-strength "Merit blue<SUP>®</SUP>" (foliar fertilizer: N<SUB>2</SUB>, 7%; P<SUB>2</SUB>O<SUB>5</SUB>, 5%; K<SUB>2</SUB>O, 3%; Mn, 0.1%; B, 0.2%; Fe, 0.08%; Cu, 0.05%; Zn, 0.05%; Mo, 0.07%; Eizai Co. Ltd., Tokyo), 3) 500 ppm GA<SUB>3</SUB>, 4) undiluted "garlic oil<SUP>®</SUP>" (main component: allyl sulfide, Rikenkagaku Co. Ltd., Kyoto) . In early November, CaCN<SUB>2</SUB> was the most effective for bud-break, followed by "Merit blue" and the least effective was GA<SUB>3</SUB> among three cultivars. 'Saijo' was the most easy cultivar to break bud dormancy. In early December, when more than 50% of buds had been broken out dormancy, application of "Merit blue" and CaCN<SUB>2</SUB> accelerated bud-break of 'Hiratanenashi' and 'Saijo' by 5-7 days, while CaCN<SUB>2</SUB> was not so effective as "Merit blue" on 'Fuyu.' GA<SUB>3</SUB> slightly promoted bud-break of all cultivars in early November but did not in early December. Application of "garlic oil" was not only ineffective on the bud-break of three cultivars, but killed buds in the December treatment. As a whole, the effect of "Merit blue" was similar to or more than that of CaCN<SUB>2</SUB> for bud-break of three cultivars of Japanese persimmon.
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