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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
Deep drains are an engineering solution to removing saline water from farmland... When the Wallatin Wildlife and Landcare group, east of Kellerberrin, had the opportunity to apply for funding to tackle salinity over two whole catchments in 2003, it jumped at the chance... Fifteen demonstration projects were set up and landholders had the opportunity to co-invest in further projects of their choice, based on technical reviews, available data and on-farm site visits by a technical team with natural resource management, hydrology, plant, and water management expertise...
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Catalogue: Ground Cover
Deep drains are an engineering solution to removing saline water from farmland... When the Wallatin Wildlife and Landcare group, east of Kellerberrin, had the opportunity to apply for funding to tackle salinity over two whole catchments in 2003, it jumped at the chance... Fifteen demonstration projects were set up and landholders had the opportunity to co-invest in further projects of their choice, based on technical reviews, available data and on-farm site visits by a technical team with natural resource management, hydrology, plant, and water management expertise...
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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...
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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: Nuffield Scholar Reports
The report proposes the idea that saline water, defined as having an electrical conductivity greater than 1.5 deciSiemens per metre (dS/m) (960 parts per million), has a part to play in filling the void of future losses of surface water... The aim of the report is to investigate if saline water can be successfully used without desalination, and what practices are required to reduce the effects of it on the crops and catchments they are applied to... Drip irrigation systems were by far the most common irrigation system using saline water...
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Catalogue: GRDC Updates
Soil salinity refers to a high concentration of salts in the landscape, mainly common salt or sodium chloride (NaCl), which has a negative impact on soil and water quality... A related protein in the test plant Arabidopsis, AtNHX1, has a very well-characterised role in salt tolerance... A deeper understanding of the mechanisms underlying this salt tolerance will be critical to the use of NHX proteins in producing transgenic salt-tolerant crop species...
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Catalogue: GRDC Final Reports
The rationale for the project was an increasing awareness that subsoil salinity is an underlying constraint to cereal production in many regions of southern Australia... Growers will have access to salt-tolerant cultivars of wheat and barley that will enable them to make more informed choices to improve the productivity and reliability of crop yields in salt-affected land... The three general mechanisms of salt tolerance in wheat and barley are the exclusion of salt, the tolerance of high internal salt concentrations in leaves ("tissue tolerance") and the tolerance of high external salt concentrations in the soil ("osmotic stress tolerance")...
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Catalogue: GRDC Updates
The silverleaf whitefly (SLW - Bemisia tabaci B-biotype) has developed into an important problem pest in cotton... SLW secretes a sticky honeydew that can contaminate cotton lint once there are open bolls in the crop (Figure 1)... In summary, the key take-home messages for managing SLW in soybeans are (a) adopt the go soft early spray strategy, (b) observe mirid thresholds, and (c) avoid late plantings in regions with a history of high late season SLW pressure...
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