Every orchard has areas that don’t perform the same. Soil changes across a block, tree vigor varies, and some spots always seem to need more water or attention than others. When you manage everything the same way, stronger areas often get more than they need while weaker zones fall behind. Traditional scouting helps, but it is easy to miss problems until they have already started affecting the crop. Monitoring tools can help close that gap when they are used in a practical way.

Satellite and aerial imagery give you a broad view of how the canopy is performing. One accessible option is Sentinel-2 imagery, which comes from a pair of satellites that capture free images of farmland every few days. These images can show differences in how vigorously different parts of your orchard are growing. Drones equipped with multispectral cameras offer another option. They can be flown on demand to capture high-resolution images in multiple light bands, giving very detailed views of canopy health and stress at the individual-tree level. Thermal imagery from aerial flights adds another layer by highlighting areas where trees are running hotter and under more water stress. Soil moisture sensors placed in different zones help show what is actually available to the roots. When you combine these sources with weather data, patterns become easier to see.

Ground-Truthing the Data
In practice, many almond and pistachio growers are already using this information to guide decisions. Some review aerial imagery that includes both vigor and water-stress maps. Others pull free Sentinel-2 data or check platforms like OpenET. OpenET is a free, open-source platform that provides satellite-based evapotranspiration data. It was developed to fill a major gap in water management by giving growers, water districts and researchers accessible, transparent estimates of crop water use.

Growers often start by looking at maps, then verify what they are seeing with a soil probe or pressure bomb in the areas that look stressed. This ground-truthing step helps confirm whether the data is pointing to real issues.

Making Practical Adjustments
From there, the adjustments are usually straightforward. Some change irrigation valve settings or run times in stressed zones while holding back slightly in stronger areas. Others use the information to target fertigation more precisely. A number of operations have divided blocks into irrigation zones after reviewing soil variability alongside imagery data.

One example from Kern County involved managing irrigation sets differently across zones based on this approach, resulting in better uniformity without a complete system overhaul. Some growers are also placing soil moisture sensors in variable areas rather than just one spot per block, then occasionally checking those readings against pressure bomb measurements to better understand what the sensors are telling them about actual tree stress.

What this looks like day to day is more focused management. Instead of treating an entire block the same way week after week, you can make smaller, targeted adjustments based on what different areas actually need. You tend to catch stress earlier before it starts reducing kernel fill. Your crews can spend less time on parts of the orchard that do not require attention. Over a season, many growers see more consistent tree performance and better use of water and nutrients.

Start Small and Build
These tools do not replace walking the orchard or your experience with how certain soils and varieties behave. They simply help you direct that experience more effectively where it matters most.

Of course, these tools still have limits. Satellite imagery, including Sentinel-2, can miss single-tree issues, and thermal readings work best when confirmed with pressure bomb or soil moisture data. Setting up zones or adding sensors takes some planning and upfront cost. The biggest risk is collecting data without actually changing how you manage the orchard.

It usually works best to start small. Focus on one or two blocks where you already suspect variability, verify what the data show and make one or two concrete adjustments before expanding further.

Turning Information Into Action
The growers getting the most value from monitoring tools treat the data as one more source of information alongside what they see in the field. You do not need to overhaul everything at once. Start by pulling recent Sentinel-2 imagery or checking OpenET data for your ranch, place a few soil moisture sensors in variable areas or talk with your PCA about available imagery options. Then take pressure bomb readings in a couple of spots to ground-truth what you are seeing.

Use that information to make one targeted change this week, whether it is adjusting an irrigation set, focusing scouting efforts or changing where you apply nutrients. When the data help you bring water or attention where the trees actually need it, the difference shows up in canopy health and how the crop finishes at harvest.

Publisher’s Take

The Big Picture: What to do Next

1. Variability exists in every orchard

Soil, water-holding capacity and tree vigor often differ significantly within the same block.

2. Use data to verify what you see

Satellite imagery, drones and soil moisture sensors are most valuable when combined with field observations and pressure bomb readings.

3. Targeted management improves efficiency

Variable irrigation and fertigation strategies can improve uniformity and resource use.

4. Start with a few blocks

Growers often see the best results by testing monitoring tools in areas where variability is already suspected.

5. Data only creates value when it drives action

Monitoring tools are most effective when they lead to management changes that address identified issues.