A different perspective on weeds in multi-species cover crops

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I frequently witness applications of herbicides prior to multi-species cover crop sowing and find myself pondering the following question: Why kill weeds when preparing to sow a multi-species cover crop whose purpose is primarily to improve soil structure and stimulate soil microbial and animal life? First let us explore...
Read More: A different perspective on weeds in multi-species cover crops

Do you get ALL the rain?

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Are you obsessed with the weather?  Is how much rain you got, or how dry it is frequently the first topic of conversation?  This is a common affliction for those of us who manage land.  We live intrinsically attuned to the weather and the cycles of the seasons.  It is rare to meet a farmer or rancher who does not diligently record their rainfall.   In a group of farmers I worked with a few years ago, a group member who was a new property owner and recently moved to our district from the city was amazed to hear how ALL of the other farmers in the group kept rainfall records.  This was such a foreign concept to her, yet those of us born and bred on the land do this without questioning it.

We clearly acknowledge the role that the amount and timing of rainfall plays in the profitability of our business as farmers.   We always know how much rain has fallen into our rain gauge.   Yet how many of us know how effectively we make use of the rain that falls on our landscape?  Rainfall provides us with valuable water essential to our farming system, and to life, for free.   Rainfall is widely recognised as a key driver of farm profit as well as being a key driver of farm losses when we fail to receive enough rain or when we receive rain in excess or at the wrong time.

Given this obviously strong relationship of rainfall to profit why is rainfall use efficiency not the number one priority for all land managers?  Even when we pay a high price for water in irrigated systems we still see soils that struggle to absorb and store valuable moisture for plant growth to make the most efficient use of this precious resource.  Often when we pay for something we value it more highly, yet this does not seem evident with respect to irrigation water, which is commonly stored in bulk in dams where lots of it gets lost to evaporation.

Rainfall use efficiency investigations undertaken on 1700 farms in northern NSW Australia (2012, Gardiner & Gammie) found rainfall use efficiency varied from 6% to 70% with an average of just 21%.  This clearly shows plenty of room for improvement.  It is highly likely that this is far worse now.  Industrial agricultural practices such as clearing, burning, cultivation, synthetic fertilisers, pesticides, over grazing, bare chemical fallows and the like have depleted the carbon in our soils.  Our soils have structurally collapsed and these degraded soils cannot absorb water when it rains.  Water either runs off creating erosion and increasing the incidence of flooding, or the water sits on the soil surface, unable to infiltrate into the soil until it is lost to the system due to evaporation.  With the water cycle broken, soils get progressively drier and we effectively create our own droughts.  Here in Australia we have a notoriously variable climate with frequent dry spells so why do we continue with agricultural practices that make matters even worse?

It seems that by resigning ourselves to the fact that we can’t control the weather and influence how much rain we receive we have forgotten to look for the aspects of the water cycle that are within our control as land managers.  Our land management can influence soil health through rebuilding soil carbon, improving the ability of our soils to absorb water when it rains and store this water for plant growth.  With every 1% of soil carbon we can store an additional 144,000 litres per hectare of water EVERY time it rains!  We can reduce losses of water due to evaporation and run off by keeping soils covered at all times.  Drought does not create bare ground, our management does.  Even if we captured just half of the water that is currently evaporating think about how much more resilience to droughts we would have!

The value of managing land to conserve water in our landscapes is clear when you consider climate data.  Table 1 shows climate data gathered from the Bureau of Meteorology in Australia for locations in 5 states to demonstrate average pan evaporation measurements as compared to average annual rainfall.  In every case evaporation is higher than rainfall.  If we want to maximize farm profits, and reduce the impact of climate variability then focusing on reducing water losses to evaporation through improved soil health is crucial and this is within our control.

Annual average rainfall (mm) Annual average pan evaporation (mm)
Rockhampton QLD 815 2112
Armidale NSW 724 1139
Longerenong VIC 415 1566
Adelaide SA 547 1467
Esperance WA 618 1638

Table 1.  Figures obtained from Bureau of Meteorology.

Managing to improve rainfall use efficiency includes focusing on

  • Maintaining living ground cover
  • Growing a diverse range of annual and perennial plants to enable rain to be used when it falls
  • Managing for high soil organic matter
  • Nurturing soil biological activity to maintain soil health
  • Avoiding practices that lead to compaction
  • Improving soil structure
  • Slowing transpiration by maintaining shelter
  • Matching land use to land capability
  • Protecting riparian areas

What we measure we can manage and improve, what doesn’t get measured, managed or improved generally contributes to a growing list of unintended consequences in farming ecosystems that quietly compound out of sight and out of mind until a major catastrophe brings our attention to them.   Here in Australia record breaking drought and wild fires are screaming at us to pay attention to the water cycle.

Start paying attention to the water cycle in your landscape by measuring and recording water infiltration rates for your soil.  You can find instructions for this simple test here.  I also encourage land managers to take those rainfall charts and start to record the production you are achieving in your business per millimetre of rain.  Keep it simple.  Work out the most appropriate time period for rainfall to contribute to your output and see how many tonnes of grain, kilograms of meat or wool etc you produced per millimetre of rain that fell.  Track this in line with your regenerative farming practices and over time this will tell you if your land management practices are taking you where you want to go.

With the focus all agricultural land managers have on rainfall, nothing will speak more loudly about the benefits of regenerative farming practices, and improve the rate of adoption of these methods, than becoming living proof that regenerative farmers get ALL the rain.

 

Written by Kim Deans.
Kim is available for coaching to empower you to create a thriving, profitable and regenerative farm business.
Email kimd@integritysoils.com  Ph +61 0455 596 46

 

Reference:  Gardiner & Gammie (2012) “Economics, productivity and natural resources in agricultural systems.”  Proceedings of the 16th ASA Conference.  http://agronomyaustraliaproceedings.org/images/sampledata/2012/8054_6_gardiner.pdf

 

Are you obsessed with the weather?  Is how much rain you got, or how dry it is frequently the first topic of conversation?  This is a common affliction for those of us who manage land.  We live intrinsically attuned to the weather and the cycles of the seasons.  It...
Read More: Do you get ALL the rain?

Detoxing from the agrarian cocaine – it’s not easy

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Eighteen months ago I bit the bullet and committed to converting our wee farm, Raumai iti, to regenerative practices. At the time I wrote a blog about why I was converting which got lots of attention. That blog had the added bonus of actually holding me to account, and helping me with...
Read More: Detoxing from the agrarian cocaine – it’s not easy

Mycoremediation to the rescue!

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Perhaps you’ve just brought a new piece of land and want to set up a garden, or you’ve had a fire come through your place. Both of these situations’ can be hiding lurking dangers, in the form of heavy metals and toxins. Many home gardeners are unwittingly growing their...
Read More: Mycoremediation to the rescue!

6 keys to successfully using biological stimulants

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Many land managers transitioning to regenerative agriculture become interested in applying bio-stimulants to bring life back into their system.  There are some simple options to explore in this realm that can suddenly have us excited about farming again.   It is SO much more fun than spending our days applying...
Read More: 6 keys to successfully using biological stimulants

Regenerate for the next generation

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Restoring soil health through regenerative agricultural practices is the key to success for families who are taking up the challenge to create a future in agriculture for younger generations.   Viable pathways for the intergenerational transfer of agricultural businesses have been diminishing and many intelligent, passionate young people have been leaving the industry...
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Break it down

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An Excerpt from Nicole Masters book For the Love of Soil: In hotter and drier environments, it’s the ants and termites who fill the niche of earthworms. They are nature’s garbage collectors, taking organic materials into their homes, aerating soil and improving water cycles. By increasing water infiltration and...
Read More: Break it down