2，4—D对金蜜李的保果效应

EFFECT OF SPRAYING 2, 4-D ON FRUIT-SETTING OF JINMI-PLUM

１９９３～１９９４年进行了２，４—Ｄ对７～８年金蜜李的保果效应试验。结果表明，叶面喷施２，４—Ｄ，能明显提高金蜜李的座果率和产量。在盛花期喷布２，４─Ｄ，座果率比对照提高８４．４％～１７３．３％，产量比对照提高１１８．５％。在盛花期和果实膨大期喷２，４—Ｄ，座果率比对照增加１６５．８％～３８４．２％，产量增加１６７．１％。２，４—Ｄ的最适保果浓度为２０ｐｐｍ，在盛花期和果实膨大期二次喷施２０ｐｐｍ２，４—Ｄ＋０．２％ＫＨ２ＰＯ４混合液的保果和增产效应最佳。

The effect of 2, 4-D on fruit setting of 7～8 years old Jinmi plum (p. salicina Lind L. ) trees was studied in 1993～1994. The results showed that mist spraying 2, 4-D could increase the fruit set percentage and yield of Jinmi plum. The fruit set percentage and yield increased by 84. 4% ～173. 3% and 118. 5% respectively as compared with control when 2, 4-D wassprayed once in the full flowering period. When 2, 4-D was sprayed twice in the periods of full flowering and fruit expanding, the percentage of fruit setting and yield increased by 165.8%～384. 2% and 167. 1% respectively comparing with CK. The optimum concentration of 2, 4-D for fruit setting was 20ppm. The effects of mist spraying 20ppm 2, 4-D and0. 2% KH2PO4 on fruit-setting and yield-increasing was the best in the full flowering and fruit expanding periods.