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自1988到1990年,在北京市林业果树研究所桃园17年生的桃树上进行了调控亏水度灌溉法(RDI-Regulated Deficit Irrigation)的试验研究。试验设有3个灌溉水平,即在果实细胞分裂完成后至快速膨大前的一段时间内果实的缓慢生长阶段(RDI期间),分别按80％(对照),40％,20％美国A级皿蒸发量补给。测得的各处理桃树的叶水势情况为:在RDI期间供水量少(处在水应力状态)的桃树,其叶水势较对照低(负的最值大);当RDI结束后各处理同样充分灌水,结果表明,此间曾经受过水应力作用的桃树的叶水势较对照(80％)高(负的量值小)。这种水应力作用的结果表现在对桃树生长量的影响上为:RDI期间,枝条的生长量明显为水势的降低所抑制;而在后期桃果实快速膨大时,经受过RDI的桃树上的果实因水势较高而膨大更快,收获时单果重更大,成熟果实略多,从而提高了产量。另外经受RDI的果树用水量明显减少,从而大幅度提高了水的利用效率。
From 1988 to 1990, a pilot study on RDI-Regulated Deficit Irrigation was carried out on the perennial peach tree in Taoyuan, Beijing Institute of Forestry and Fruit Research. The experiment consisted of three irrigation levels, namely the slow growth phase (RDI period) of fruits during the period from the completion of the cell division to the rapid inflation, followed by 80% (control), 40%, 20% Evaporation volume supply. The measured leaf water potential of each peach treated was as follows: the water potential of peach trees with low water supply (in the state of water stress) during RDI had lower leaf water potential (negative maximum); and when the RDI was completed, The same irrigation was sufficient and the results showed that the leaf water potential of peach trees subjected to water stress was higher (80%) than the control (negative value). The effect of water stress on the growth of peach trees was as follows: During RDI, the growth of shoots was obviously inhibited by the decrease of water potential; on the peach trees subjected to RDI at the later rapid peach fruit enlargement Of the fruit swollen faster due to higher water potential, fruit weight is greater when harvested, slightly more mature fruit, thereby increasing the yield. In addition, the water consumption of fruit trees significantly reduced as a result of RDI, thus greatly improving water use efficiency.