How SA-1000 & SoilGuard™ Na Reduced Sodium Hazard and Improved Pistachio Soil Health in California

Case Study Summary

Soil salinity and sodium infiltration can silently erode productivity in permanent crops like pistachios. When infiltration slows and nutrients become tied up in the root zone, tree vigor, yield, and long-term orchard health are put at risk.

For one large California pistachio grower, elevated sodium and bicarbonates in irrigation water were creating variability across blocks and limiting performance. They needed a scalable, cost-effective solution that would reclaim soil structure while protecting future productivity.

Results at a Glance

Facility Background

• Industry: Agriculture
• Application: Soil health management and salinity mitigation
• Primary Issue: Elevated sodium and bicarbonates reducing infiltration and nutrient availability
• Apex Solution: SA-1000 banded applications combined with continuous SoilGuard™ Na feed

The field in Kerman, California was experiencing significant salinity and sodium infiltration challenges. Elevated sodium levels were reducing water infiltration, tying up key nutrients like calcium and iron, and impairing overall tree vigor. Variability between blocks — with some SAR values nearly double others — raised concerns about long-term yield and profitability.

The Challenge

The grower’s irrigation water contained elevated sodium and bicarbonates, contributing to:

• Reduced infiltration rates

• Nutrient tie-up, particularly calcium, phosphorus, and iron

• Uneven soil chemistry across blocks

• Increased risk to long-term orchard health

Without intervention, soil imbalance threatened sustained productivity and operational profitability.

The Apex Solution

Apex implemented a two-part soil amendment program designed to displace sodium and restore nutrient mobility:

• SA-1000 applied in band treatments to target sodium displacement and calcium mobilization

• SoilGuard™ Na delivered through continuous feed in select blocks

• Line maintenance support to maintain application consistency

• Ongoing soil, tissue, and water sampling to track measurable improvements

• Planned winter leaching project to flush residual sodium and further strengthen soil structure

The integrated approach focused not only on immediate sodium displacement, but on long-term soil structure improvement and nutrient optimization.

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Results & Operational Impact

The treatment program delivered measurable agronomic and economic improvements:

• SAR and ECe levels declined compared to 2024, confirming reduced sodium hazard

• Calcium and phosphorus became more available in the root zone

• Depth-based soil analysis showed sodium decreasing and calcium increasing at deeper layers

• Tissue tests reflected improved nutrient balance, particularly phosphorus

• Iron tie-up began to ease

• Average program cost: $130 per acre, with expected efficiency gains from reduced remediation needs

Encouraged by these results, the grower plans to expand the program and implement a winter leaching strategy to further reduce surface salts and protect long-term soil health

Applicable To

This solution is ideal for:

• Pistachio and almond growers

• Permanent crops impacted by salinity

• Agricultural operations with high-sodium irrigation water

• Farms experiencing infiltration challenges or nutrient tie-up

• Growers seeking sustainable soil reclamation strategies

Conclusion

Salinity and sodium imbalance don’t have to dictate orchard performance. Through a strategic combination of SA-1000 and SoilGuard™ Na, this California pistachio grower restored infiltration, mobilized critical nutrients, and reduced long-term soil risk — all while maintaining cost efficiency.

At Apex, we help growers protect yield, optimize soil chemistry, and build long-term sustainability into their operations.

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