This article is based on a talk Colin Austin — inventor of the wicking bed — gave during a China tour in September 2009. Climate change, shifting rainfall, and rising evaporation are reshaping how we grow food. It highlights practical, low-tech, and biological solutions: wicking beds, soil regeneration, micro-hydrology, and local water harvesting. Combining resilient soil biology with targeted water capture and efficient irrigation helps communities protect food production, restore land, and make agriculture more reliable in a hotter, drier climate.
Introduction
My aim is to share practical approaches that respond to the twin pressures of climate change and water shortages. China and Australia share many challenges: large land areas, regions of low rainfall and dependence on river systems that originate in distant mountains. Recent droughts in both countries show how fragile food systems can be when water becomes scarce.
I will describe a horticultural system that has performed well in dry, variable climates: the wicking bed. I will also examine the broader issues that threaten future food production — climate shift, competition for water, degraded soils and pathogens — and show how micro-biology and micro-hydrology can form the core of a resilient response. Finally, I’ll outline practical steps we can take at farm and community scales to safeguard food supply.
Part 1 — Overview of Wicking Beds
Wicking beds are a horticultural system that combines micro-hydrology and micro-biology to produce exceptional plant growth while using minimal water, nutrients and labour. The basic design includes an underground reservoir that holds water and acts as a decomposition zone. Capillary action wicks moisture up into the root zone where soil stays moist without becoming saturated. There is no loss of water beyond the root zone and very little evaporation from the surface.
For maximum benefit the root zone soil must be nutrient rich and well structured. Special worm breeds and active microbial communities convert organic residues into readily available nutrients and, at the same time, create a porous, aggregated soil structure. The result: a layer in the soil with the ideal balance of air and water for continuous plant growth.
Wicking beds can be small boxes for research and household gardening, semi-raised beds for heavier soils, or larger in-ground installations for production. They can be fed by existing irrigation or by local water harvesting systems. The system concentrates scarce water into small, highly productive areas — a key strategy when water is limited.
Part 2 — Fears about Future Food Production
Climate shift
Climate change shifts traditional climate zones. Areas that once received reliable winter rain may find the rainfall pattern has moved. In southern Australia, for example, winter rains that once fell inland are now more likely to fall further south, often over the ocean. Rivers that depend on mountain snowmelt are threatened by reduced snowfall and earlier melt, removing a natural seasonal water store that farmers have relied on.
Competition for water
Population growth and urban expansion increase demand for high quality water, often redirecting supplies away from irrigation. Agriculture competes with cities and industry for the same limited resource. At the same time, runoff of agricultural chemicals creates conflicts between urban and rural water uses. These pressures make efficient on-farm water use more urgent.
How real is the threat of food shortages?
Global food production has increased in many regions, thanks to better genetics and farming methods. But these gains often depend on higher inputs of water and fertiliser. Where water supply limits these inputs, productivity cannot expand. In many places the problem is not absolute crop production but distribution and access: poverty, politics and infrastructure failures often cause hunger even when global supplies are adequate. Still, climate change threatens to limit the effectiveness of current high-input systems unless we build resilience.
The role of soil
Modern intensive farming often treats soil as merely a physical support for crops, with nutrients supplied externally. While this can be productive short term, it externalises ecological functions and weakens soil microbial life. Long-term resilience requires soils that host active microbial and fungal communities capable of cycling nutrients and supporting plant health.
Pathogens and disease
Highly sanitized, input-heavy systems can invite new disease problems. Removing biological complexity often allows opportunistic pathogens to dominate; many microorganisms rapidly evolve resistance to chemical controls. Restoring soil biology helps keep pathogens in balance and reduces reliance on chemical inputs.
Pioneering species and competition
Microbial communities behave much like plant communities: pioneer organisms colonise disturbed environments rapidly and are later outcompeted by slower-growing, beneficial microbes. Managing soil to favour beneficial communities is therefore essential for long-term health.
Living soil
Increasing soil carbon and fostering a living microbiome can dramatically improve soil function. While short-term gains from chemical fertilisers can seem economically attractive, the sustainable path is to rebuild biological fertility so soils retain water, resist erosion and support nutrient-dense crops.
Climate change in Australia
Australia’s southern agricultural belt has seen shifting rainfall and reduced snowmelt in upstream catchments. This forces a rethink of where and how we grow crops. Some areas may need to be retired from intensive agriculture, while others could be developed with appropriate, climate-adapted methods.
Local water harvesting schemes
Because large river systems are fully allocated, local water harvesting becomes important. Small dams, recharge pits and ephemeral creek capture can soak water into the ground to recharge local water tables. These stored subsurface waters can be pumped later, often yielding more usable water than would appear from surface capacity alone.
Targets for Australia
Key priorities are protecting traditional production areas, opening new regions as climate belts shift, and accepting that some marginal lands must be retired. Combining local harvesting, efficient irrigation and soil regeneration can protect food supplies even as climates change.
Part 3 — The Importance of Microbiology
Land degradation
Past decades of erosion and intensive tillage have shown how easily topsoil can be lost. Rehabilitation requires restoring soil structure, organic matter and microbial life. Early experiments showed that simple, single-variable fixes rarely work; regeneration depends on combinations of practices tailored to local conditions.
Soil regeneration
My experiments showed that areas with moderate, uniform moisture and active microbiology regenerated fastest. Moisture is necessary but not sufficient — microbes and worms must be supported with food (organic matter) and appropriate moisture regimes so decomposition and nutrient cycling proceed efficiently.
No single solution — use a combination of methods
Soil regeneration is complex. Successful restoration typically combines compost, green manures, crop rotation, reduced tillage and targeted water management. Mathematical optimisation rarely replaces hands-on adaptation to local variabilities.
Water plays a crucial role
Even apparently uniform paddocks have complex underground flow paths. Where moisture is moderately and consistently maintained, microbial activity and plant growth recover. Where soils dry excessively or remain waterlogged, regeneration lags. Managing subsoil moisture is therefore central.
Microbiology regenerates soil
Worms and microbes are the primary agents of regeneration. Worms cannot process raw plant matter without microbial pre-processing; microbes must be supplied with energy (organic matter) and maintained at suitable moisture and temperature ranges. Creating those conditions accelerates soil formation and carbon sequestration.
Part 4 — Micro Hydrology
Sturt and Simpson deserts
Deserts show how local hydrology can determine vegetation. The Sturt Desert has hard flat soils that shed rain and favour evaporation; it supports little vegetation. The Simpson Desert, with dunes and clay pans, can capture and route water into underground sinks, producing brief but intense greening after storms and supporting deeper-rooted plants.
Importance of micro hydrology
The lesson is that local landform and subsurface structure amplify water into concentrated zones where plants can access and store it. For agriculture we can imitate these processes: create percolation holes, capture water in underground stores and amplify scarce rainfall into productive beds.
Percolation holes
When deep roots die, they leave channels that allow deeper infiltration — natural percolation holes. In managed systems we can create or preserve such channels and design landscapes to move water underground where it is less prone to evaporation.
Water amplification
Concentrating water into smaller, well-managed areas produces far greater growth than attempting to wet large areas poorly. Desert plants and human systems alike benefit when water is amplified into productive zones.
Part 5 — Sources of Water
Where large rivers are exhausted, rain harvesting and groundwater recharge become critical. In landscapes with high evaporation, shallow dams that allow percolation into the soil — rather than sealed reservoirs — can replenish local water tables and store water in subsurface reservoirs. Planting trees and maintaining vegetative cover recycles moisture locally, increasing humidity and the probability of rain. Sewage and organic waste can also be treated and used as a nutrient-rich water source if managed safely.
Part 6 — The Wicking Bed Technology
Background to the wicking bed system
The wicking bed concept began as a cheap, easy way to store water for critical crop stages in erratic rainfall zones. A subsurface reservoir supplies nutrient-rich water to the root zone via capillary action. The topsoil remains dry at the surface, reducing evaporation, while a moist layer at rooting depth supplies conditions ideal for microbes and roots.
A new horticultural system
Wicking beds are not simply an irrigation trick: they form the basis of a horticultural system where some land is devoted to highly productive wicking beds while other land is used to harvest water and deeper nutrients. Deep-rooting plants grown on non-irrigated land extract nutrients and return them via biomass into the wicking system, creating a cyclical nutrient flow.
Applications
Wicking beds are flexible. Small boxes are useful for research and household food production. Semi-raised beds work well in heavy clays and high summer rainfall zones. Above-ground beds suit community groups without earth-moving equipment. Wicking beds can be adapted for trees using raised or ringed reservoirs and for row crops using narrow subsurface reservoirs that move laterally to serve multiple plants.
Part 7 — Carbon Capture
Plants extract carbon from the atmosphere but return much of it quickly through decay. If organic material decomposes in dark, humid, subsurface conditions it is processed by fungi and worms into forms that remain in the soil for many years. Wicking beds can accelerate this process: biodegradable material is incorporated and decomposed underwater in a controlled manner, then wicks up as nutrient-rich solution to feed plants while locking carbon in soil aggregates.
Sustainable soils with high organic matter also store significant carbon. Paying farmers for verified soil carbon sequestration — ideally through practical, process-based monitoring — would create economic incentives to adopt regenerative practices. This would support farmers financially, improve soil fertility and help offset greenhouse gas emissions.
Practical Steps and Final Thoughts
Practical actions include: protect and restore soil organic matter; adopt subsurface and water-efficient irrigation such as wicking beds; create local water harvesting infrastructure that recharges groundwater; plant deep-rooted trees on non-irrigated land to mine and recycle nutrients; encourage community composting and safe reuse of organic wastes; and explore carbon incentive schemes tied to regenerative practices.
No single technology is a silver bullet. The future of agriculture will be found by combining genetic advances with careful water management, living soils and community cooperation. If we focus on the fundamentals — water and biology — we can adapt food systems to a hotter, drier world and support resilient, nutrient-rich production for generations to come.
Colin Austin — © Creative Commons. Reproduction for private use permitted with source acknowledgement; commercial use requires a license.
