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Reference values of maximum daily trunk shrinkage for irrigation scheduling in mid-late maturing peach trees

机译：中晚熟桃树灌溉计划中最大日树干干缩的参考值

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Precise irrigation is essential in arid and semi-arid areas where water is scarce, such as the South-East of Spain. Therefore, finding a precise and reliable plant water status indicator, which could be automatically monitored, is of paramount importance. Maximum daily trunk shrinkage (MDS) showed some potential for irrigation scheduling. However, MDS records may be difficult to interpret and reference baselines could be useful for this interpretation. In the current study, measurements of midday stem water potential (Psi s) and MDS were taken over a 3-year period in peach trees [Prunus persica (L.) Batsch cv. 'Catherine], in order to obtain reference baselines for irrigation scheduling. Plants were daily irrigated above their water requirements (similar to 120%) in order to obtain non-limiting soil water conditions. Climate parameters and MDS were recorded automatically, whereas midday stem water potential was assessed in the field every 3 days. The relationships between MDS and climate parameters such as ET0, daily maximum and midday air temperatures (T-max and T-mid, respectively), maximum and midday air vapour pressure deficit (VPDmax and VPTmid, respectively) were determined. The results indicate that MDS records were better related to Tmid and Tmax than to other meteorological variables. The relationship between MDS and klf, differed from year to year. However, these relationships varied greatly with the conditions of each year, tree phenological stage and crop load. Therefore, the growers must be aware of these factors when using MDS values for irrigation scheduling. (C) 2016 Elsevier B.V. All rights reserved.
机译：在西班牙东南部等缺水的干旱和半干旱地区，精确灌溉至关重要。因此，找到一个可以自动监控的精确可靠的工厂用水状态指示器至关重要。每日最大干缩率（MDS）显示出灌溉计划的潜力。但是，MDS记录可能难以解释，参考基线可能对此解释有用。在当前的研究中，桃树[Prunus persica（L.）Batsch cv。）在3年的时间内对中午茎水势（Psi s）和MDS进行了测量。 [凯瑟琳]，以便获得灌溉时间表的参考基准。为了获得非限制性的土壤水分状况，每天对植物进行高于其需水量（约120％）的灌溉。自动记录气候参数和MDS，而每3天在田间评估中午茎水势。确定了MDS与气候参数之间的关系，例如ET0，每日最大和中午气温（分别为T-max和T-mid），最大和中午空气蒸气压差（分别为VPDmax和VPTmid）。结果表明，MDS记录与Tmid和Tmax的关系比与其他气象变量的关系更好。 MDS和klf之间的关系每年都不同。但是，这些关系随着每年的状况，树木物候期和作物负荷的不同而有很大差异。因此，当使用MDS值进行灌溉计划时，种植者必须意识到这些因素。 （C）2016 Elsevier B.V.保留所有权利。

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