Two year fallow with soy and chickpeas.
Region: Mackay Whitsundays | Eton
Second generation Mackay cane farmers Gerry and Barb Deguara have long been leaders in the Mackay sugar industry. The family has led the way in innovative farming practices, offering others the opportunity to learn from their experiences.
It all started in the early 1980’s with major changes to their water infrastructure and the successful use of centre pivots for irrigation. More changes happened with the adoption of a two metre controlled traffic farming system with rotational legume fallow crops.
This meant many hours in the shed modifying farm equipment and harvesting gear over 10 years to get the desired results. The farm is now entirely converted to a 2m controlled traffic farming system with Gerry singing the praises of the wide rows which allow him to maximise the growing area of his paddocks.
In 2009 the controlled traffic system was improved through a major change to his harvesting operations, moving to reverse filling of haul-outs on GPS.
They have integrated other crops into their farming system; growing chickpea, soybean, peanut, mung bean and other legumes during their fallow season. This will be improved with the Project Catalyst two year fallow research project.
Gerry and Barb like to look locally for their farm nutrients with mill mud and a Bio-dunder (a by-product of molasses fermentation), mixed with urea providing most of the farms nutrients. “I believe that everything that can be recycled should be, and the by-products of our Mackay harvest should be returned to our paddocks for nutrient,” explained Gerry, who uses no dried fertiliser in his farming system.
The Deguara’s have a history of working closely with industry bodies to investigate new technologies and farming practices. This helps them incorporate the changes on their own farm and gives them the opportunity to learn new ways of reducing their impact on natural resource condition.
Issues being addressed
Prolonged farming of one crop leads to a decrease in soil nutrients and can create a build up of pathogens and pests related to the crop. Traditionally cane farmers will leave a block fallow for a year after four to five years of sugarcane production to break this trend. Recently growers, such as Gerry, have planted legumes in the fallow as a rotational crop.
Legumes are a green manure that fix nitrogen and improve soil structure. While legumes can be harvested they are often used only for their nitrogen contribution. Other benefits of a fallow crop are good soil cover to prevent sediment loss and improved weed control. Gerry and Barb are seeking to get all of these benefits with minimal cost penalty.
Solution being tested
They are trialling a two year fallow system (Soybean to Chick Pea to Soybean Rotation) in their sugarcane operation. Currently the Deguara’s break their sugarcane crop with a single soybean fallow crop. Fallow crops provide a range of benefits to cropping systems and a number of trials have indicated that extending the fallow period will provide additional agronomic benefits.
Extending the length of the fallow system is designed to improve soil health in treated areas and increase the yield of subsequent plant cane crops. In addition the Deguara’s are also likely to observe benefits through reduced nitrogen fertiliser requirement of plant cane which will lead to improved water quality benefits, reduced risk, and extra income generated from harvesting the three fallow crops.
Determining the implications of transitioning to the two year fallow system an investment analysis was undertaken. Grossmargins (GM) for the “before” (single soybean fallow) and “after” (two year soybean-chickpea-soybean fallow) production systems were estimated. The GM were used to estimate the change in profitability or cash flow that results from the specified change in individual production system.
The marginal change in cash flow was substituted into a Net Present Value (NPV) analysis. The sum of the change over a 10 year period is discounted at 7% to convert the benefits of the management practices change into today’s dollar terms.
Key economic drivers of change
Outcome and change
It is expected that changing to a soybean to chick Pea to soybean rotation system will increase the property gross margin by $28/ha. The improvement in gross margin is driven primarily by an increase in plant cane yield following the extended fallow. This is coupled with a reduction in the rate of applied fertiliser during plant cane and extra income generated from the two year fallow crops. However, these effects are offset by the reduced area under cane on the farm that results from lengthening the crop cycle.
Benefits for the Deguara’s of adopting this management practice change are unlikely to be known until the first plant cane crop was harvested in 2015. However, an investment analysis estimated that transitioning to the two year fallow system would return a positive Net Present Value of $223/ha. The annual change in GM is discounted at 7% over a 10 years investment period. The positive NPV result demonstrates that the stream of future benefits from the management practice change is likely to be in excess of the cost incurred to undertake the investment. This result indicates that transitioning to a two year fallow system is likely to be a viable economic investment.
Water quality outcomes
The reduction in nutrient application under the extended fallow system offers significant water quality benefits for the Sandy Creek region. Source data shows water quality has improved over the last four years with a
decrease in Dissolved Inorganic Nitrogen (DIN) and Total Suspended Solids (TSS) in the Sandy Creek catchment.
“Because we are on the borders of the Great Barrier Reef, there has to be a co-existence between what the Reef is about and its living beings and what we do out here on the property.”
Joe Muscat, Farmer, Mackay Region, Queensland
WWF believes in sustainable agriculture. We believe it is both possible and profitable to feed, clothe and fuel a growing global population, without harming wildlife or sensitive ecosystems on which we all depend. That’s why WWF supports Project Catalyst.
Sugar cane production generates significant benefits for Australia, but it also affects sensitive ecosystems, like the Great Barrier Reef. Farm run-off contains fertiliser, pesticides and soil, some of which ends up on the Reef. The impact on corals and seagrass, and the species that rely on them for food and shelter, is significant.
Since 1985, total Reef coral cover has halved. Over 40 per cent of this loss has been attributed to outbreaks of the coral-eating crown of thorns starfish, which are fuelled by nutrients in run-off from farms.
Many farmers are now acting to change this.
A CATALYST FOR CHANGE
As part of Project Catalyst, leading cane farmers are working with WWF-Australia, the Coca-Cola Foundation, Natural Resource Management Groups, the Australian Government and others to develop practical, cost-effective solutions to
improve water quality on the Reef.
Project Catalyst provides funding, extension support and a forum for growers to share their experiences, forum for growers to share their experiences, while trialling more sustainable and efficient practices.
Watch this video to see first-hand how Project Catalyst farmers are making a difference.
Project Catalyst has successfully trialled more precise methods for applying fertiliser, which can reduce nutrient pollution by up to 60%. Herbicide pollution on the trial farms has been reduced by
as much as 95%, while satellite-controlled machinery has reduced pollution run-off from heavy clay soils by up to 20%.
?As a farmer I feel we all should be doing our bit for this planet. I think if everybody does their bit it will make a difference. And we?re looking after the land we want to make a living off.?
? Tony Bugeja, Farmer, Mackay Region, Queensland
WWF works with some of the world?s biggest buyers of sugar to promote Bonsucro, the international standard for sustainable sugar production. Our aim is to help consumers choose products that
don?t cost the earth, while also helping farmers who produce more sustainably to differentiate their products in the market place.
Over the past five years, around 900,000 hectares of land worldwide has been certified to the Bonsucro standard, equivalent to 59 million tonnes of certified sustainable sugar cane and
2.7m3 of certified sustainable ethanol.
WWF is committed to the future of Project Catalyst and supporting a sustainable sugar industry in Australia. Our aim is to see that the practices proven by Catalyst farmers are widely
adopted throughout Australia, and are reflected in the Bonsucro global standard for sustainable sugar.
We also hope to replicate the outstanding success of Project Catalyst within the Australian beef industry. As with Project Catalyst, our new Project Pioneer brings together leading beef producers in
Australia to share their knowledge and promote a more sustainable beef industry that operates in harmony with nature.
1. Brodie, J., Waterhouse, J., et al, Land use impacts on Great Barrier Reef water quality and ecosystem condition. Reef Water Quality Protection Plan Secretariat. 2013 Scientific
2. De?ath, G., Fabricius, K. E., et al, 2012. The 27?year decline of coral cover on the Great Barrier Reef and its causes. Proceedings of the National Academy of Sciences.
For more information about WWF?s work on sugar, beef and other commodities, visit wwf.org.au/markets