What causes poor water infiltration in soil (and how to fix it)

Lauren Oehme
May 22
3 min read

You can apply the right amount of water at the right time and still struggle to achieve the results you expect.

Why?

Because irrigation performance isn’t only about how much water is applied, it’s also about how effectively that water moves into the soil and reaches plant roots.

Poor water infiltration is a common challenge across many farming systems and can quietly impact productivity, leading to wasted water, stressed plants, and reduced yields.

The good news is that understanding the causes often reveals practical solutions.

What is water infiltration?

Water infiltration refers to the movement of water from the soil surface into the soil profile.

Healthy infiltration allows water to:

Reach plant roots efficiently
Carry nutrients into the root zone
Reduce runoff and surface pooling
Improve soil moisture consistency

When infiltration slows, water can remain near the surface where it is more vulnerable to evaporation or runoff.

What causes poor water infiltration in soil?

Poor water infiltration in soil typically occurs when soil structure is restricted by compaction, low organic matter, surface sealing, or poor root-zone conditions, preventing water from moving efficiently through the soil profile.

Understanding the causes of poor water infiltration in soil is the first step toward improving irrigation performance and ensuring water reaches where it is needed most.

Common causes of poor water infiltration

Soil compaction

Compacted soils have fewer air spaces and reduced pore structure. This can occur due to:

Heavy machinery
Stock traffic
Repeated cultivation

Compaction limits water movement and restricts root development.

Low soil organic matter

Organic matter helps create healthy soil structure. Low organic content can reduce:

Soil aggregation
Water holding capacity
Microbial activity

Surface sealing or crusting

Some soils can develop a dense surface layer following rainfall or irrigation. This layer restricts water entry into the soil profile.

Poor root-zone oxygen levels

Roots require oxygen to function effectively. Poorly aerated soils can:

Reduce root activity
Increase plant stress
Create conditions that favour disease

How to improve water infiltration

There is rarely a single solution, but several management practices can help:

Improve soil health
Increase organic matter
Reduce excessive cultivation
Use cover crops where appropriate

Improving soil structure helps create more pore space for water movement and healthier root development.

Reduce compaction

Minimise unnecessary machinery traffic
Manage stock movement

Reducing compaction can improve soil porosity and support more effective water movement through the root zone.

Review irrigation application

Check application rates and scheduling
Avoid exceeding soil infiltration capacity

Applying water at rates that suit soil conditions can reduce runoff and improve efficiency.

Improve root-zone conditions

Emerging technologies are also focusing on improving how water behaves within the soil itself.

Addressing poor water infiltration in soil can lead to healthier roots, better water efficiency, and improved plant growth.

How nanobubbles may help

Nanobubble technology introduces microscopic oxygen-filled bubbles into irrigation water. Research and field applications suggest nanobubbles may help:

Improve water infiltration into soils
Increase dissolved oxygen availability
Support stronger root systems
Enhance microbial activity

Healthier roots and better soil conditions can improve how effectively water moves through the root zone.

Control vs nanobubble soil samples — *Control (L) vs Nanobubble Agritech-treated (R) soil samples; note the reduced compaction, the lighter, more friable soil, and the bigger, stronger root mass following nanobubble treatment.*

Real-world observations

Growers using nanobubble irrigation systems have reported:

Improved soil structure
More consistent moisture distribution
Healthier plant performance

These improvements may help create a growing environment where water is used more effectively.

https://video.wixstatic.com/video/b70b29_82818116991644a28d9b7656fa7eba48/480p/mp4/file.mp4

WATCH: Nanobubble Agritech CEO Leon Power on-farm in Culverden, demonstrating how systems allow water to target the root zone directly, with limited surface and evaporative losses.

Looking ahead

Water availability is becoming increasingly important across agriculture and horticulture.

Making every drop count isn't just about applying more water, it's about improving how effectively that water moves through the soil and supports plant growth.

Improving infiltration can deliver benefits that extend well beyond irrigation efficiency alone.

Frequently Asked Questions (FAQs)

How do I know if my soil has poor infiltration?

Signs of poor water infiltration in soil can include:

Water pooling on the surface
Uneven plant growth
Dry patches
Surface runoff
Irrigation taking a long time to soak into the soil

Can soil compaction affect irrigation performance?

Yes. Soil compaction reduces pore space within the soil profile, restricting water movement and limiting root development.

Can nanobubbles improve water infiltration?

Research and field observations suggest nanobubbles may improve water infiltration by increasing dissolved oxygen levels and supporting healthier root-zone and soil conditions.