The continuous monitoring of water stress will increase the accuracy of the deficit irrigation scheduling. Almonds are very sensitive to water stress conditions and an important water consumer. Recently, a novel approach to the use of trunk growth rate (TGR) data has been proposed for olive trees. These works suggested the use of TGR frequencies to evaluate water status of the trees. The aim of the current work was to compare the seasonal pattern of three different indicators derived from the daily curves of trunk diameter fluctuations with midday stem water potential. During three consecutive seasons (2017–2019), an irrigation experiment was carried out in a mature almond orchard (cv Vairo) at Dos Hermanas (Seville, Spain). Four irrigation treatments replicated in four blocks were evaluated using the daily curves of midday stem water potential and trunk diameter fluctuations. The different irrigation treatments were: Control, full irrigated conditions; RDI-1 (irrigation scheduling based on midday stem water potential with a deficit irrigation during kernel filling [values around −1.2 MPa]); RDI-2(similar to RDI-1 but with a more severe water stress [−2 MPa]) and incomplete recovery after harvest due to limitation of the seasonal amount of water (around 100 mm); SDI, sustained deficit irrigation with a seasonal applied water equal to RDI-2. Trunk diameter fluctuations were measured with a wireless band dendrometer. The daily curves were processed to obtain three different indicators. Maximum daily shrinkage (MDS) was the difference between the daily maximum and minimum. Trunk growth rate (TGR) was the difference between two consecutive daily maximums. The frequencies of several ranges of TGR were compared with the midday stem water potential. Weekly frequencies of values greater than 0.3 mm day⁻¹ decreased with the reduction of midday stem water potential, but the pattern changed greatly in different seasons. The weekly frequency of values between − 0.1 and 0 and between 0 and 0.1 mm day⁻¹ were steadier in different seasons. Differences between seasons were related to growth pattern and yield.

对水分胁迫的持续监测将提高缺水灌溉调度的准确性。杏仁对水分胁迫条件非常敏感，并且是重要的水消耗者。最近，针对橄榄树提出了一种使用树干生长率 (TGR) 数据的新方法。这些工作建议使用 TGR 频率来评估树木的水状况。当前工作的目的是比较从树干直径波动与中午茎水势的每日曲线得出的三个不同指标的季节模式。在连续三个季节（2017-2019 年）期间，在 Dos Hermanas（西班牙塞维利亚）的成熟杏仁园（cv Vairo）进行了灌溉试验。使用中午茎水势和树干直径波动的每日曲线评估在四个区块中重复的四个灌溉处理。不同的灌溉处理是： 对照，全灌溉条件；RDI-1（基于中午茎水势的灌溉计划，在籽粒灌浆期间灌溉不足[值约为-1.2 MPa]）；RDI-2（类似于 RDI-1，但具有更严重的水分胁迫 [-2 MPa]），由于季节性水量（约 100 毫米）的限制，收获后恢复不完全；SDI，使用等于 RDI-2 的季节性应用水的持续亏缺灌溉。用无线带状树状计测量树干直径波动。处理每日曲线以获得三个不同的指标。最大日收缩量 (MDS) 是日最大值和最小值之间的差值。树干增长率 (TGR) 是两个连续每日最大值之间的差异。将几个 TGR 范围的频率与中午茎水势进行了比较。大于 0.3 毫米天的值的每周频率^-1随着正午茎水势的降低而降低，但不同季节变化较大。- 0.1 和 0 之间以及 0 和 0.1 毫米天^-1之间的值的每周频率在不同季节更稳定。季节之间的差异与生长方式和产量有关。