Why the World is Shifting to Water-Soluble Fertilizers

Water-soluble fertilizers are driving a global shift from volume-based fertilization to precision-led nutrient efficiency. By enabling accurate placement, improved pH management, and better nutrient availability in the root zone, WSFs help growers achieve higher yields and quality with fewer inputs. As agriculture faces increasing economic and environmental pressure, water-soluble fertilizers are emerging as essential tools for sustainable, high-performance crop nutrition.

Across global agriculture, a clear shift is underway. Growers are facing the challenge of producing higher yields, with improved quality, and more consistent results while using fewer inputs, protecting natural resources, and managing rising costs. In this context, water-soluble fertilizers are no longer niche products for high-value crops alone. They are becoming central tools in modern, precision-led crop nutrition strategies.

The shift toward water-soluble fertilizers was a key theme of the ICL webinar “Beyond Nutrition: Why pH Is the Key to Fertilizer Performance”, featuring insights from ICL Growing Solutions specialists Brian Mann and Christi Falen.

They explore how the wider use of water soluble fertilizers is not simply about convenience or formulation. It reflects a broader move in agriculture from volume-driven nutrition to value-driven efficiency, where every kilogram of nutrient applied must deliver measurable agronomic, economic, and environmental returns.

From Volume to Value in Crop Nutrition

Historically, fertilizer success was often measured by the amount applied. Today, success is increasingly defined by nutrient use efficiency, how effectively plants can access and utilize the nutrients already present in the soil, alongside those applied during the season. During the webinar, ICL Agronomist Brian Mann explains how he is seeing a continued pressure to grow more with less, which you can see at 4’25”.

Water-soluble fertilizers illustrate this transition clearly. Their growth has been closely linked to the expansion of precision irrigation systems, including drip and fertigation, as well as protected cropping. However, their adoption is now accelerating beyond these systems as growers recognize their role in improving nutrient availability, placement accuracy, and overall system efficiency.

Rather than adding more nutrients, water-soluble fertilizers support a “more from less” approach, unlocking existing soil reserves and delivering nutrients precisely when and where crops need them.

Precision Tools, not just Nutrient Carriers

One of the defining advantages of water-soluble fertilizers is their ability to function as precision agronomic tools rather than simple nutrient carriers. Their high solubility enables uniform distribution through irrigation systems, starter bands, or targeted placements in the root zone.

This precision becomes especially powerful when combined with pH management. Soil pH strongly influences nutrient availability, affecting both macronutrients and micronutrients. In many agricultural regions, alkaline soils or high bicarbonate irrigation water limit nutrient uptake, even when soil tests indicate adequate nutrient levels.

Water-soluble fertilizers formulated to manage pH allow growers to influence conditions in the rhizosphere, the narrow zone around plant roots where nutrient uptake actually occurs. By adjusting pH locally rather than attempting to change the entire soil profile, it becomes possible to improve nutrient availability efficiently and economically.

Unlocking Nutrients already in the Soil

Managing pH at the root-zone level has been shown to unlock nutrients that are otherwise chemically tied up in the soil. Even small, precise shifts in pH can dramatically increase the availability of phosphorus, potassium, and micronutrients, particularly in calcareous or high-pH soils.

During the webinar above (at 7’40”), Christi Falen highlights how it is not practical to try to change the pH of the soil across the field, instead what growers really can do, is target their applications to influence the soil pH in the rhizosphere, or the root zone.

This approach delivers multiple benefits at once:

• Improved nutrient uptake from both applied fertilizers and existing soil reserves
• Reduced total fertilizer requirements, particularly for phosphorus
• Better early-season crop establishment through enhanced starter nutrition
• Lower environmental risk associated with nutrient losses

Field data across a range of crops, including row crops and specialty crops, demonstrate that targeted, acidic water-soluble fertilizers can achieve significantly higher nutrient efficiency compared with conventional fertilizer sources, often using substantially lower application rates.

How do WSFs Support Irrigation Performance and System Reliability?

Water-soluble fertilizers are designed with compatibility and water conditioning in mind, helping maintain clean irrigation systems while ensuring nutrients remain available to crops.

Careful use of water soluble fertilizers can help mitigate issues that water quality can have on fertilizer efficiency. High bicarbonate levels, incompatible fertilizer blends, or poor solubility can lead to scaling, precipitation, and blockages within irrigation systems, reducing uniformity, increasing maintenance, and limiting nutrient delivery.

Correctly using water soluble fertilizers protects infrastructure, improves water use efficiency, and supports consistent crop performance throughout the season.

In this way, water-soluble fertilizers contribute not only to crop nutrition but also to the reliability and longevity of precision irrigation systems.

Expanding Beyond Specialty Crops

While water-soluble fertilizers were first widely adopted in high-value horticultural systems, their role is expanding rapidly into broader agricultural markets. Starter fertilizers for crops such as maize, soybean, potato, and sugar beet are increasingly incorporating water-soluble technologies to support early root development and efficient nutrient uptake.

Precise placement at planting, whether through fertigation, banding, or starter applications, allows young plants to access nutrients immediately, accelerating early growth and supporting stronger root systems. Once established, crops are better positioned to utilize nutrients already present deeper in the soil profile.

This strategy aligns closely with the principles of precision agriculture and the 4Rs of nutrient stewardship: right source, right rate, right time, and right place.

The Next Step: Integrating Biology and Efficiency

As water-soluble fertilizers continue to evolve, the next phase of innovation focuses on integration, combining precise nutrition with enhanced efficiency technologies and biological support.

Improving soil enzyme activity, supporting beneficial microbial populations, and enhancing nutrient cycling all contribute to better long-term soil function. When water-soluble fertilizers are combined with compatible biostimulants, such as ICL’s BIOZ biostimulants, or enhanced-efficiency components, such as controlled release fertilizers, they can influence not only nutrient chemistry but also plant physiology and soil biology.

This integrated approach helps crops maintain performance under stress, improves nutrient diffusion in the rhizosphere, and supports more resilient production systems, without increasing input intensity.

A Smarter Approach to Sustainable Productivity

The global shift toward water-soluble fertilizers reflects a deeper transformation in agriculture. Growers are no longer focused solely on what they apply, but on how effectively crops can use it. Precision, efficiency, and sustainability are now inseparable from profitability.

By enabling targeted pH management, improving nutrient availability, protecting irrigation systems, and supporting biological activity in the soil, water-soluble fertilizers have become key tools in modern crop nutrition programs.

As agriculture continues to face pressure to produce more with fewer resources, water-soluble fertilizers represent not just a change in formulation, but a smarter solution for sustainable, high-performance farming.