PP333对巨峰葡萄的化学控制效果

CHEMICAL CONTROL EFFECTS OF PACLOTRAZOL (PP333)ON'KYOHO'GRAPES (Vitis labrusca L.x V.vinifera L.)

用PP333处理巨峰葡萄扦插苗,结果表明:土壤施用量为0.5g a.i./m^2时32天后极显著地延缓地上部生长,施用量为1.0g a.i/m^2时,只需15天。根际施用能促进根系发育,增强根的活性和提高根冠比。盛花期或花后3周叶面喷布3000ppm或6000ppm的PP333均能抑制当年或第二年的新梢生长,并增加单枝花序数、果枝比率和产量,但1987年产量降低,用500、1000和2500ppm的PP333在盛花期进行叶面喷布,除2500ppm处理外均不能有效地抑制新梢生长,所有的处理均能够使产量增多,叶片增厚,果穗增重,单位叶面积的叶绿素含量和比叶重(SLW)增加。解剖学观察表明:叶片虽然变厚,但栅栏组织和海绵组织的厚度比并未变化,叶面喷布增加了果穗的紧密度,小果粒比例略有增高;果实着色晚,着色差;这可能是由于果实可溶性固形物下降造成的。

Spray and soil application of paclotrazol(PP333) on 'Kyoho' grape cuttings suggested that soil application with Ig ai/m^2 and 0.5g ai/m^2 retarded shoot growth markedly in comparation with controls 15 days and 32 days after treatment respectively. application to soil stimulated the development of roots and increased the root-top ratio and activety of roots.Foliar application of paclotrazol with 3000 and 6000ppm at full blooming period or 3 weeks after that in 1985 reduced shoot growth and increased clustor numbers per shoot, productive shoots and yield in 1985 and 1986, but the yield was significantly reduced in 1987. Spray at full blooming period with 500 and 1500ppm treatments, except 2500 ppm, could not be inhibited shoot growth. The cross section of leaves showed that thickness ratio of palisade layer/spongy tissue was not changed and the leaf thickness of treated grapes was increased. There were significant effects in the yield, chlorophyllper unit leaf arer, specific leaf weight(SLW) and clustor weight between treated, and control trees. Although foliar application increased the compactness of clustor, produced little more 'small berries' in size. Treated grapes did not color as early as the controls and were not more completely colored than controls, may be, lower soluble solids of the fruit juice resulted in the occurrence.