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首页> 外文期刊>Acta Horticulturae >Partial rootzone drying and deficit irrigation of 'Gala' apples in a semi-arid climate.
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Partial rootzone drying and deficit irrigation of 'Gala' apples in a semi-arid climate.

机译：半干旱气候下“加拉”苹果的部分根区干燥和亏水灌溉。

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A field experiment was conducted during the 2002 growing season under the semiarid conditions in Colorado, USA, to determine the effects of deficit irrigation (DI) and partial root zone drying (PRD) on water use, fruit and shoot growth, yield, fruit quality, stomatal conductance, leaf water potential, and whole-leaf abscisic acid concentration of apple cv. Gala grafted on M26. Irrigation was via two drip lines, one either side of the tree row. There were five irrigation treatments: a well-watered control, 25 PRD, 50 PRD, 75 PRD and DI. For PRD, the numbers represent the percentage of irrigation volume relative to the control as well as the proportion of the surface area wetted by irrigation. The DI received 50% of the irrigation volume applied to the control, but irrigation was applied to the whole surface area. Water savings of 50% and 25-75% were achieved under DI and PRD, respectively, without negatively affecting fruit size. Total seasonal irrigation volumes were 232, 195, 157 and 120 mm for the control, 75 PRD, DI and 50 PRD, and 25 PRD treatments, respectively. Fruit growth rate, final fruit size, and fruit quality at harvest and after cold storage did not differ between treatments. Compared to published data, very low midday values were observed for stomatal conductance and transpiration rates at comparatively high (less negative) leaf water potentials. Effects of several feed-forward processes on apple hydration status in response to high diurnal vapour pressure deficit values (4-6 kPa) and chemical signals are discussed.
机译：在2002年生长期，在美国科罗拉多州半干旱条件下进行了田间试验，以确定缺水灌溉（DI）和部分根区干燥（PRD）对水分利用，果实和枝条生长，产量，果实品质的影响苹果简历的气孔导度，叶片水势和全叶脱落酸浓度。联欢晚会嫁接到M26。灌溉是通过两条滴水线，在树行的任一侧。共有五种灌溉方法：灌溉良好的对照，25 PRD，50 PRD，75 PRD和DI。对于PRD，数字代表相对于对照的灌溉量百分比，以及通过灌溉润湿的表面积的比例。 DI接受的灌溉量为对照的50％，但灌溉量应用于整个表面积。 DI和PRD分别节水50％和25-75％，而对果实大小没有负面影响。对照，75 PRD，DI和50 PRD和25 PRD处理的季节性总灌溉量分别为232、195、157和120 mm。处理之间，果实的生长速度，最终的果实大小和收获时以及冷藏后的果实品质没有差异。与已发布的数据相比，在较高（较小的负值）叶片水势下，气孔导度和蒸腾速率的午间值非常低。讨论了一些前馈过程对高水汽日压差值（4-6 kPa）和化学信号响应的苹果水合状态的影响。

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