亏缺灌溉时期对番茄果实品质和产量的影响

实验研究了亏缺灌溉不同开始时期对番茄品质、产量形成和水分利用率影响。不同时期开始亏缺灌溉果实的营养品质明显不同，亏缺灌溉开始的越早，果实的硬度和密度越大，可溶性固形物含量(Brix)、滴定酸度、维生素C的含量越高，但糖酸比变化不大；随着亏缺灌溉开始时间的提前，单果重逐步减少，结果数变化不大，产量降低的幅度也越大；膨大期和座果期开始亏缺灌溉水分利用率提高，开花期开始亏缺灌溉水分利用率下降。生产中应选择膨大期开始亏缺灌溉，既可以提高品质，又可以减少产量降低带来的负面影响。

Effects of different deficit irrigation periods on yield and fruit quality of tomato

The effects of different deficit irrigation periods on plant yields, fruit quality and water use efficiency of tomato were studied. It was showed that the fruit qualities under different deficit irrigation periods were different. The earlier the deficit irrigation, the firmer and denser the fruit, and the higher the content of soluable solid content, organic acid, vitamin C of tomato fruit, but the sugar/acid ratio changes little. Fruit amount did not change while per fruit weight reduced. The water use efficiency increased when deficit irrigation treatment started from swelling period or setting fruit period, but decreased from Anthesis period. The beginning period of deficit irrigation was suggested as swelling period of first cluster.