调节栽培技术条件下土施多效唑对四季蜜杧反季节开花结果的综合效应

Integrated effects of soil application of PP_(333) combining with adjusted cultivation techniques on off-season flowering and fruiting of Sijimi mango(Mangifera indica L.)

在春季施肥、修剪的情况下,在2005年6月11日,对四年生四季蜜杧单株分别用1.0、2.0、3.0、4.0 g多效唑进行土施处理,结果表明,3.0 g/株处理和4.0 g/株处理的四季蜜杧8月份成花率显著高于对照的,3.0 g/株处理的成花率最高,为87.0%。处理剂量达到或超过3.0 g/株时,叶片变短、变窄,叶片数增加,但枝条长度未受影响。单花序花期9～10 d,开花前期两性花比例高,后期低,2.0 g/株处理的两性花比例最高。从多效唑对四季蜜杧成花率、坐果率、产量以及叶片正常发育等方面的综合影响来看,以2.0 g/株处理的效果较好。

4-year-old Sijimi mango （Mangifera indica L. ） trees fertilized and pruned in spring were treated with PP333 of 1.0 g, 2.0 g, 3.0 g and 4.0 g per tree respectively on June 11th. The results showed that trees treated with PP333 of 3.0 g and 4.0 g per tree showed higher percentage of flower formation than that of contrast in August. Trees treated with PP333 of 3.0 g per tree showed the highest percentage of flowering （87.0%）. When PP333 was over 3.0 g per tree, the leaves of the trees became shorter and narrower, whereas the leaf number increased. There was not effect on the length of shoots. The anthesis of a single panicle lasted for 9 to 10 days with a higher percentage of hermaphrodite flower appeared at early stage of the anthesis and lower at late stage. Trees treated with PP333 of 2. 0 g per tree showed the highest percentage of hermaphrodite flower and had the best effect on the percentage of flower formation, the fruit setting rate, the yield and the leaves of the trees.