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available soil water

Catalogue: GRDC Final Reports
Transient salinity in soils, characterised by high concentration of salts in the subsoil, varies with depth and changes throughout the season in response to rainfall, surface evaporation, water use by vegetation and the leaching fraction (hydraulic conductivity) of the clay layer... Experiments in our project have shown that transient salinity (accumulation of salt in root zone layers, not influenced by watertable) affects crop yield and growth in dry land regions mainly by reducing water use efficiency of crops through osmotic effect, although toxic effects of individual ions such as sodium can also cause yield reduction... The results indicate that gypsum application improves leaching of salts...
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Catalogue: Ground Cover
Figure 1 Growth of wheat plants treated with Hoag land nutrient solutions of varying salinity.. Experiments in our project have shown that transient salinity - accumulation of salt in root zone layers not influenced by the watertable - affects crop yield and growth in dryland regions, mainly by reducing water-use efficiency of crops through osmotic effect... Hoagland solution was used to reduce the specific ion toxicity to a minimal level and find out the effects of osmotic pressure, irrespective of the type of salt...
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Catalogue: GRDC Media
A new online resource is a good first 'port of call' for Western Australian growers seeking information about managing summer weeds, which are currently widespread... Growers know that weeds allowed to grow during a fallow will use available soil water, use soil nitrogen and add seeds to the seed bank, increasing weed pressure and control costs in following seasons... Log in or register to leave a comment...
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Catalogue: GRDC Media
Moisture retention and VRT paying off for Egans.. To improve their profitability and productivity, Scaddan growers Gavin and Elaine Egan pay keen attention to summer weed control and in recent seasons have introduced variable-rate technology (VRT) for application of inputs... In 2012, the Egans returned to a blanket rate in their fertiliser applications after a hailstorm at the end of 2011 wiped out most of their cereals, leaving little harvest data for the yield mapping on which VRT applications are based...
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Catalogue: Ground Cover
The GRDC is examining the potential for new R&D investments involving tractor- and implement-mounted soil probes, or totally new approaches that don't suffer from the time lags and delays of current laboratorybased procedures... These might, for example, enable growers to measure the soil nitrogen available at the time of sowing and to adjust starter N rates ... While there are risks involved in such research, the potential pay-offs are highespecially with many growers moving to precision agriculture farming methods, which allow them to target fertiliser or other treatments directly to high- and low-producing areas in paddocks...
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Catalogue: Ground Cover
The GRDC is examining the potential for new R&D investments involving tractor- and implement-mounted soil probes, or totally new approaches that don't suffer from the time lags and delays of current laboratorybased procedures... These might, for example, enable growers to measure the soil nitrogen available at the time of sowing and to adjust starter N rates ... While there are risks involved in such research, the potential pay-offs are highespecially with many growers moving to precision agriculture farming methods, which allow them to target fertiliser or other treatments directly to high- and low-producing areas in paddocks...
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Catalogue: Broadacre Field Crops DAFF QLD
Many natural waters contain impurities that make them directly harmful to crops... Knowledge of a water supply's quality, assessed by chemical analysis, is essential in determining its usefulness in an irrigation system... When irrigation water containing residual alkalinity is used on clay soils containing exchangeable calcium and magnesium, sodium from the residual alkalinity in the water will replace calcium and magnesium in the soil...
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Catalogue: Broadacre Field Crops DAFF QLD
Many natural waters contain impurities that make them directly harmful to crops... Knowledge of a water supply's quality, assessed by chemical analysis, is essential in determining its usefulness in an irrigation system... When irrigation water containing residual alkalinity is used on clay soils containing exchangeable calcium and magnesium, sodium from the residual alkalinity in the water will replace calcium and magnesium in the soil...
Related categories:
Catalogue: Broadacre Field Crops DAFF QLD
Many natural waters contain impurities that make them directly harmful to crops... Knowledge of a water supply's quality, assessed by chemical analysis, is essential in determining its usefulness in an irrigation system... When irrigation water containing residual alkalinity is used on clay soils containing exchangeable calcium and magnesium, sodium from the residual alkalinity in the water will replace calcium and magnesium in the soil...
Related categories:
Catalogue: GRDC Media
A new online resource is a good first 'port of call' for Western Australian growers seeking information about managing summer weeds, which are currently widespread... Growers know that weeds allowed to grow during a fallow will use available soil water, use soil nitrogen and add seeds to the seed bank, increasing weed pressure and control costs in following seasons... Log in or register to leave a comment...
Related categories:

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