Soil water content criteria for peach trees water stress detection during the postharvest period
Soil water content criteria for peach trees water stress detection during the postharvest period
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DOI：
10.1016/j.agwat.2011.11.015
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发表时间：
2012-02-01
影响因子：
6.7
通讯作者：
Ruiz-Sanchez, M. C.
中科院分区：
文献类型：
--
作者：
Abrisqueta, I.;Vera, J.;Ruiz-Sanchez, M. C.
基于土壤水湿度传感器的灌溉调度要求土壤水状态保持在最适合植物生长的范围内。这项工作的目的是评估通过多传感器电容探头测量的土壤含水量动态是否可用于确定干燥土壤的指数，以检测桃园水分胁迫的开始。为此，在穆尔西亚（西班牙）的滴灌成熟桃树园进行了一项实验。在采后期间，将灌溉良好的树木（对照处理）与两种水分胁迫处理进行比较，其中两种水分胁迫处理包括以两种方式应用一个月的干燥周期：停止灌溉（快速胁迫）和逐渐减少灌溉（渐进胁迫）。使用多传感器电容探头连续测量土壤含水量（SWC）。植物水分胁迫的开始是通过胁迫树和对照树之间中午茎水势 (Psi(stem)) 的第一个显着差异来确定的。 “转折点”（干燥土壤中 SWC 相对快速减少到较慢速率之间的转变）以及 SWC 衍生指数的稳定，与严重到减少植物吸水量的水分胁迫水平的出现一致，从 Psi（茎）减少判断。结果表明，对于早熟桃树的灌溉管理，可以使用电容探头在采后期间田间持水量的 90% 设定较低的 SWC 限值。 (C) 2011 Elsevier B.V. 保留所有权利。
Irrigation scheduling based on soil water moisture sensors requires that the soil water status be maintained within a range that is optimal for plant growth. The objective of this work was to evaluate whether soil water content dynamics, measured by multi-sensor capacitance probes, could be used to determine indices of a drying soil to detect the commencement of water stress in a peach tree orchard. For this, an experiment was carried out in a drip irrigated mature peach tree orchard in Murcia (Spain). During the postharvest period well irrigated trees (control treatment) were compared with two water stress treatments consisting of a drying cycle applied for one month in two ways: withholding irrigation (Rapid Stress) and progressively reducing irrigation (Gradual Stress). The soil water content (SWC) was measured continuously using multi-sensor capacitance probes. The beginning of plant water stress was identified by the first significant difference in midday stem water potential (Psi(stem)) between stressed and control trees. The 'breaking point' (the transition between a relatively rapid reduction of SWC in the drying soil to a slower rate) as well as the stabilization of the SWC-derived indices coincided with appearance of a water stress level as severe as to reduce plant water uptake, as judged from the Psi(stem) reduction. The results suggested that a lower SWC limit could be established for irrigation management in early maturing peach trees using capacitance probes at 90% of the field capacity value during the postharvest period. (C) 2011 Elsevier B.V. All rights reserved.