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soil water storage

Catalogue: Ground Cover
Queensland University of Technology's Professor Peter Grace discusses strategies to help avoid nitrogen losses at a recent GRDC Grains Research Update... The loss is caused by chemical reactions on the surface of the soil, and only occurs in alkaline soils when ammonium-based fertiliser is broadcast and there is no rain to wash it into the soil... Rain is required to wash the fertiliser deeper into the soil profile, but not too much that it could cause denitrification or leaching...
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Catalogue: GRDC Final Reports
Experimental data are presented that show that fallow management, in particular that of weeds and residue cover, not only affects the amount of water stored or lost during the summer, but also has an effect on the loss of water past the root zone during the subsequent growing season... Model simulations capture these effects and a scenario analysis indicates that retaining residues past sowing increases the risk of deep water loss relatively rapidly... The effects of different residue management will be greater in wetter summers...
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Catalogue: GRDC Updates
Much of the research in cover cropping has been undertaken on the fertile heavy clay soils typically used for grain production in the northern region... Little research has been undertaken on lighter, red, upslope regions that are often hard setting following rainfall if surface cover is low... The results of the trial suggest that over large areas, PA tools can detect differences in soil moisture, crop growth and final yield as a result of variation in management...
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Catalogue: GRDC Final Reports
The treatments included harvesting the stubble for straw, standing vs. flattened stubble, and early or late control of summer weeds... Further testing would be beneficial... We encourage measurements of soil water status as these integrate the effects of all these factors...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture... I was educated by a group of farmers at Varley in 1982, to the importance of Crop Updates is a partnership between the Department of Agriculture, Western Australia and the Grains Research & Development Corporation 22.. Advisers and consultants should highlight the management options available to their clients, do sensitivity analyses which in effect, tell the client 'what happens to production, quality and profitability, if he chooses a certain management option ' and show how that changes with input levels, season, soil type, prices going up/down, etc...
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Catalogue: GRDC Final Reports
The project has demonstrated that summer fallow management can play an important role in regulating soil moisture storage, either to reduce the risk of deep drainage, or to benefit the crop... The lysimeter experiments showed that a 4 t/ha residue cover past sowing (early and mid June) could reduce evaporation losses by approximately 10 mm in 2005 (see Fig. A2) and 15 mm in 2006... To minimise the risk of deep drainage, residue retention should be avoided as much as possible and residue loads reduced to 1 t/ha or less, unless required for other purposes (e.g. erosion control)...
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Catalogue: GRDC Media
Research quantifies benefits of summer rainfall.. While crop residue on the surface of paddocks plays an important role in preventing wind and water erosion, it has little impact on the amount of water stored in the soil from summer rain... "Even if a grower received 25mm of rain on April 15, there would only be 7 or 8mm of moisture left in the soil by the start of May, which is obviously beneficial and provides an opportunity for seeding, but is less than growers might have thought," he said...
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Catalogue: GRDC Final Reports
Farmers across southern Australia are adopting no-till farming systems that have potential for greater water use efficiency (WUE) and greater risk of drainage... The strong links established between CSIRO, WANTFA and the Department of Agriculture and Food Western Australia (DAFWA) are a very useful outcome for further research in this area... The links established between CSIRO, DAFWA and WANTFA are strong and should be maintained to ensure rigorous research and rapid adoption...
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