Flood Irrigation. Photo by Trent Voss
strategies with your PCA. As I’ve said in previous articles, the only thing guaranteed for farmers is death, taxes and weeds! The earlier you jump on them, the easier they are to maintain. Cultural Practices & Field Prep Post harvest is also the time for field maintenance: • Float orchard floors to smooth out harvest disruptions. • Rototill areas with heavy plant residue. • Plan for winter shaking and pre-emergent herbicide applications. Final Thoughts The post-harvest and dormant season passes quickly. A proactive plan ensures you make the most of this critical window. With thoughtful planning, focused dedication, and a little luck you’ll set the stage for a strong and productive 2026.
PCA/CCA before applying boron, as overapplication can cause toxicity. Apply foliar nutrients promptly after harvest to ensure trees absorb and store energy before leaf drop. Zinc: Should I Apply it Post Harvest? Historically used to induce dormancy, zinc sulfate is now primarily applied to reduce disease inoculum (e.g., scab, rust). Avoid early applications in healthy orchards, as premature leaf drop can disrupt photosynthesis and carbohydrate storage, potentially reducing bloom. There are many other post-harvest foliar nutrient mixes that include zinc that will not burn leaves and can be absorbed by the tree. Consult with your PCA on which fit is best for your situation. Soil Amendments: Tailor it to Your Needs Review soil samples with your PCA/CCA to determine the right amendments: • Ag Lime: Raises pH in acidic soils. • Dolomite: Raises pH and adds magnesium if needed. • Sulfur: Lowers pH in alkaline soils. • Gypsum: Improves water infiltration by reducing crusting without affecting pH. Weed Management Winter weeds emerge quickly post harvest. Use the UC IPM Weed Photo Gallery to identify species and select appropriate herbicides. Discuss pre-emergent
Trent Voss, Sr. Regional Manager, Blue Diamond Growers
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SEPTEMBER–OCTOBER 2025
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