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Harnessing AQUA4D technology

A sustainable solution for soil salinity and water efficiency in agriculture

By Jeff Nunes, Agricultural Division, AQUA4D U.S.
September 22, 2025
This photo shows salt buildup around new pistachio plants in the Kern Delta in California with salt levels at 50dS/m.
This photo shows salt buildup around new pistachio plants in the Kern Delta in California with salt levels at 50dS/m.
CEU Approved

Soil salinity and water scarcity are two of the most pressing challenges in modern agriculture. In arid and semi-arid regions, excessive soil salts and limited freshwater resources threaten crop productivity, soil health, and long-term agricultural sustainability. Innovative water treatment technologies, such as AQUA4D, are emerging as effective tools to address these critical issues. Earn 0.5 CEUs by reading this article and taking the quiz.


Soil salinity and water scarcity are two of the most pressing challenges in modern agriculture. In arid and semi-arid regions, excessive soil salts and limited freshwater resources threaten crop productivity, soil health, and long-term agricultural sustainability. Pistachios are considered relatively salt tolerant compared with many other fruit and vegetables crops, meaning they can withstand higher levels of salinity in the soil where they grow; however, even though they are salt tolerant, high salinity can still negatively affect their health and nut quality if not managed properly. However, innovative water treatment technologies, such as AQUA4D, are emerging as effective tools to address these critical issues.

AQUA4D is a chemical-free water treatment technology that uses resonant frequencies and electromagnetic fields that alters the dipole of the water molecule. Dipole refers to the polarity of a water molecule (H2O) where the oxygen atom has a slightly negative charge and the hydrogen atoms have a slightly positive charge, creating a distinct positive and negative end on the molecule due to the uneven distribution of electrons; this polarity allows water molecules to form hydrogen bonds, improving mineralization, increasing water penetration, mobilizing toxic levels of elemental buildup, and enhancing nutrient uptake by roots. Recent greenhouse and soil column studies have demonstrated significant water efficiency in saline conditions and plant growth when using AQUA4D-treated water. 

This article explores the scientific findings from two key studies: one focused on pistachio trees grown in saline greenhouse conditions and another examining salt-leaching efficiency in soil columns. These scientific reports highlight AQUA4D technology’s efficacy to aid with sustainable agricultural practices. 

Understanding the challenge of soil salinity and water scarcity

Soil salinity occurs when soluble salts accumulate in the soil to levels that adversely affect plant growth. Excess sodium (Na), chloride (Cl), and boron (B) ions can disrupt the uptake of essential nutrients, cause leaf burn, reduce chlorophyll content, and ultimately stunt plant growth. In pistachio trees, excessive boron and salt levels often lead to defoliation, reduced photosynthesis, and diminished yield. 

Water scarcity exacerbates these challenges. When irrigation is inadequate or inefficient, salts accumulate rather than being leached away. Addressing these issues requires both innovative irrigation strategies and technologies that improve water efficiency and leaching capacity.

AQUA4D technology treats water using low-frequency electromagnetic fields, which alter water's molecular structure. This change improves water penetration into the soil, enhances nutrient delivery to plant roots, and facilitates the leaching of harmful salts.

Key findings from the greenhouse pistachio study

Figure 1. In a greenhouse experiment, pistachio trees were grown in a 10-gallon pot with drip irrigation and sap and stem diameter sensors.

In a greenhouse experiment conducted in Fresno, CA, researchers examined the effects of AQUA4D-treated water on ‘Golden Hills’ pistachio trees grown in highly saline soil obtained from a ranch in South Kern County (see image above) with 50 dS/m electrical conductivity (EC). Trees were grown in a 10-gallon pot with drip irrigation from an isolated water source, and sap and stem diameter sensors were used to measure xylem volume/flow and track quantifiable growth data (Figure 1).

Here are the key findings from the greenhouse experiment:

  1. Improved water uptake: Trees irrigated with AQUA4D-treated water absorbed 4.1 gallons compared with 0.2 gallons in control trees (Figure 2).
  2. Reduced soil salinity: AQUA4D-treated soil exhibited lower EC and reduced levels of sodium, chloride, and boron.
  3. Enhanced tree growth: AQUA4D-treated trees showed greater scion length, root dry weight, and shoot/leaf biomass.
  4. Higher chlorophyll content: Treated trees had significantly higher leaf chlorophyll levels, improving photosynthesis efficiency.
  5. Scion length increase: Average scion growth was 8.7 cm greater in AQUA4D-treated trees than control (Figure 3).
  6. Nutrient uptake: Treated trees had lower toxic boron levels in leaves, bark, and roots, preventing nutrient imbalances and toxicity symptoms (Figure 4).
     
Figure 2. Sap flow measurements indicated that trees in Aqua4D-treated salty soil collected 4.1 gallons while control trees only collected 0.2 gallons.

 

Figure 3 (left): Average scion growth was 8.7 cm greater in AQUA4D-treated trees than the control. Figure 4 (right): Treated trees had lower toxic boron levels in leaves, bark, and roots, preventing nutrient imbalances and toxicity symptoms.

 

These results demonstrate how AQUA4D technology creates a more favorable soil environment, promoting healthier plant growth even in high-salinity conditions.

Key findings from the soil column study at Fresno State 

A separate soil column study at California State University, Fresno, further validated AQUA4D's ability to enhance salt leaching efficiency. This study assessed the ability of AQUA4D to influence the leaching of salts in soil. The experiment was comprised of eight soil columns. The soil columns were clear acrylic tubes that were suspended vertically to allow for the flow of water. The irrigation water had an EC of 2.5 dS/m.

The volume of drain water was lower in AQUA4D-treated columns due to soil moisture retention, and the EC of drain water was much higher with AQUA4D. Overall, AQUA4D water treatment led to an EC that was 30% higher than the control for the final two weeks of the experiment. These results clearly demonstrate the leaching effect of AQUA4D.

  1. Slower percolation rate: AQUA4D-treated water percolated 21% slower, allowing more effective salt leaching.
  2. Higher EC in drain water: Treated water resulted in a 30% EC in drain water, indicating more salts were removed from the soil.
  3. Increased salt leaching: AQUA4D-treated water leached 493 mg of salt compared with only 198 mg in the control.
  4. Greater salt removal per water unit: AQUA4D-treated water removed 2.31 times more salt per milliliter of water than untreated water.

These results indicate that AQUA4D enhances water's ability to mobilize and leach salts, reducing soil salinity more efficiently.

Environmental and economic benefits

The improved performance of AQUA4D-treated water is rooted in its ability to modify water's physical behavior at the molecular level. Using resonant frequencies and electromagnetic fields, AQUA4D-treated water can better infiltrate soil pores and reach plant root zones more efficiently. This improved infiltration reduces water loss, optimizes irrigation efficiency, and promotes salt leaching.

Additionally, AQUA4D treatment reduces the risk of soil compaction and crusting, further enhancing water distribution and nutrient uptake.

Environmental and economic benefits include:

  1. Reduced water usage: More efficient water infiltration reduces overall water requirements.
  2. Decreased fertilizer dependency: Improved nutrient delivery reduces the need for excess fertilizers.
  3. Lower soil salinity: Effective salt leaching minimizes soil degradation.
  4. Higher yield potential: Improved plant health results in higher crop productivity.
  5. Sustainability: AQUA4D supports long-term agricultural sustainability by addressing both water efficiency and salinity issues.

Future implications for agriculture

While greenhouse and laboratory studies provide controlled insights, our large-scale field trials are essential to validate AQUA4D's efficacy under real-world farming conditions. Preliminary results from pistachio, almond, stone fruits, and wine grapes all suggest that AQUA4D has the potential to become an industry-standard technology for managing soil salinity and improving water efficiency in all crops.

AQUA4D technology offers a promising, sustainable solution to two of agriculture's biggest challenges: soil salinity and water scarcity. By improving water infiltration, enhancing salt leaching, and optimizing nutrient uptake, AQUA4D supports healthier plants, increased yield potential, and long-term soil health.

For pistachio growers in saline-prone regions like California's Central Valley, adopting AQUA4D technology could lead to significant environmental and economic benefits.

Self-study CEU quiz

Earn 0.5 CEUs in Soil & Water Management by taking the quiz for the article. For your convenience, the quiz is printed below. The CEU can be purchased individually, or you can access as part of your Online Classroom Subscription.

  1. AQUA4D technology treats water using chemical additives to reduce salinity in soil.

    a. True. 

    b. False. 

     

  2. What was the measured water uptake in pistachio trees irrigated with AQUA4D-treated water compared with control trees in the greenhouse study?
    a. 0.5 gallons vs. 0.1 gallons.
    b. 2.0 gallons vs. 1.0 gallons.
    c. 4.1 gallons vs. 0.2 gallons.
    d. 8.0 gallons vs. 2.5 gallons.

 

  1. In the soil column study, how much more salt was leached using AQUA4D-treated water compared with the control?
    a. 100 mg vs. 50 mg.

    b. 250 mg vs. 100 mg.

    c. 493 mg vs. 198 mg.

    d. 600 mg vs. 400 mg.

     

  2. Which of the following was NOT a reported benefit of AQUA4D-treated water in pistachio trees?
    a. Higher chlorophyll content.
    b. Increased scion length.
    c. Enhanced root dry weight.
    d. Greater nutrient toxicity symptoms.

     

  3. Which of the following best explains how AQUA4D improves water efficiency?
    a. By altering the dipole of water molecules with electromagnetic fields.
    b. By removing all minerals from the water.
    c. By adding chemical agents to enhance infiltration.
    d. By increasing the soil’s natural salinity levels.

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