调亏灌溉对滴灌核桃树生长及产量的影响

Effects of regulated deficit irrigation on growth and yield of walnut trees under drip irrigation

为探究调亏灌溉对滴灌核桃树生理指标的影响。本试验分别对花期、果实膨大期、花期+果实膨大期进行调亏灌溉,以分析不同生育期内调亏对作物生理性状变化规律的影响。研究结果表明:调亏灌溉总体上对果型发育和果实产量均起负作用。但在开花结果期进行轻度调亏灌溉会抑制果树新梢旺长,保证了果树生殖器官的发育,提高了果实数量,对核桃树产量起到正作用。故本研究认为在开花结果期进行轻度调亏灌溉,对作物产量起到正作用,而加重调亏程度或在其他生育期进行调亏,极易出现落果、空果现象,作物产量下降。

To explore the effects of regulated deficit irrigation on physiological indicators of walnut tree with drip irrigation,three different experiments were conducted,namely regulated deficit irrigatio on florescence,regulated deficit irrigation on fruit expanding stage,and regulated deficit irrigation on both the two stages mentioned above,so that the effects of regulated deficit irrigation on the physiological characteristics of crops in different growth stages could be analyzed. The results has showed that regulated deficit irrigation had a negative effect on fruit development and fruit yield. Slight regulated deficit irrigation inhibited the growth of new shoots in flowering and fruiting stages,to ensure the reproduction organs developed well,so the quantity of fruits increased,and it had positive effect on walnut yield. Therefore this study suggested that regulated deficit irrigation should be carried out in flowering and fruiting stage of walnut tree,for it plays positive role on the fruit yield. However,increasing deficit degree or making regulate deficit on other growing stage will easily cause to fruit drop or empty,so the fruit yield will be drop.