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首页> 外文期刊>Irrigation Science >Evaluation of partial root-zone drying for potential field use as a deficit irrigation technique in commercial vineyards according to two different pipeline layouts
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Evaluation of partial root-zone drying for potential field use as a deficit irrigation technique in commercial vineyards according to two different pipeline layouts

机译：根据两种不同的管道布局，对部分根区干燥进行评估，以作为商业性葡萄园中潜在的田间灌溉技术来进行田间灌溉

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The use of partial root-drying (PRD) irrigation implies doubling pipelines instead of using a conventional single pipeline. However, pipelines can be spaced a short distance apart (e.g. 1 m) along the vine row (“D” layout) or joined with cable ties and laid as a single pipeline (“S” layout). Pipelines in “S” configuration are laid under the vine row, and in “D” at both sides of the vine row. These two different layouts can change the wetted soil zone and affect grapevine response to irrigation. The focus of this study was therefore on establishing the role of pipeline layout in vine-grape (cv. ‘Tempranillo’) response under semi-arid conditions in which PRD is managed as a deficit irrigation technique. Six irrigation treatments were applied, which resulted from the combination of Control (C, full irrigation), PRD and seasonal sustained deficit irrigation (SSDI), and “S” and “D” pipeline layouts. SSDI and PRD were irrigated to 50% C throughout the irrigation season, and C irrigation was scheduled according to a crop water balance technique. Midday stem water potential (Ψstem) and leaf conductance (gl) indicated that, on the whole, PRD treatments had a slightly higher water status than SSDI treatments, but a substantially lower status than C treatments. Use of the “D” pipeline layout significantly reduced Ψstem in both PRD and SSDI treatments and in some instances for Control conditions, too. Berry yield, vine intercepted radiation, leaf abscisic acid (ABA) and gl were highly correlated with Ψstem. Differences in water status between PRD-S and SSDI-S, according to a sub-surface irrigation test, seemed to be more related to changes in soil evaporation losses and irrigation efficiency than to any intrinsic PRD effect. PRD-S accounted for water savings equivalent to 10% according to the ratio between applied water and grape production for the SSDI-S treatment, whereas PRD-D berry yield was not significantly different from that associated with the SSDI-S treatment. In conclusion, under the growing conditions of this experiment, PRD-S offered the possibility of slightly improving water conservation when irrigation was applied to the soil surface.
机译：使用部分根系干燥（PRD）灌溉意味着管道要加倍，而不是使用常规的单个管道。但是，管道可以沿着葡萄藤行（“ D”布局）间隔很短的距离（例如1 m），也可以与电缆扎带相连并作为一条管道铺设（“ S”布局）。 “ S”配置的管道铺设在葡萄藤行的下方，“ D”配置在葡萄藤行的两侧。这两种不同的布局可以改变湿润的土壤区域并影响葡萄对灌溉的反应。因此，本研究的重点是确定在半干旱条件下将PRD作为一种亏水灌溉技术进行管理的葡萄藤（cv。“ Tempranillo”）响应中管道布局的作用。实施了六种灌溉处理措施，这是由于控制（C，完全灌溉），珠三角和季节性持续赤字灌溉（SSDI）以及“ S”和“ D”管道布置的结合​​而产生的。在整个灌溉季节，将SSDI和PRD灌溉至50％C，并根据作物水分平衡技术安排C灌溉。午间茎水势（Ψstem）和叶片电导率（gl ）表明，总体而言，珠三角处理的水状态比​​SSDI处理略高，但状态远低于C处理。在PRD和SSDI处理中以及在某些情况下，对于控制条件，使用“ D”管线布局可显着减少Ψtem。浆果产量，藤蔓截留辐射，叶片脱落酸和gl 与sub茎高度相关。根据地下灌溉试验，PRD-S和SSDI-S之间的水状况差异似乎与土壤蒸发损失和灌溉效率的变化更相关，而不是与PRD的任何内在影响有关。根据SSDI-S处理的施用水量与葡萄产量之间的比例，PRD-S节约的水量相当于10％，而PRSD-D浆果的产量与SSDI-S处理无明显差异。总之，在该实验的生长条件下，当对土壤表层进行灌溉时，PRD-S提供了稍微改善节水的可能性。

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