Irrigating Walnut Trees in 2025 – Continuing Research on When to Start

irrigating walnut 2025 graph 1

Figure 1: Summary of average orchard water requirement (ET minus rain) and applied irrigation for all delayed irrigation tests to date (2014 – 2020). Averaged over all sites and years thus far, the delay period has been almost two months (indicated by arrow) compared to the start of ET. The total water applied to the delay trees has only been about 50% of the orchard ET need (ET-rain).

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