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Catalogue: GRDC Research Summaries
" Precision Agriculture Special in Australian Journal of Agricultural Research (AJAR) Project Code: CPU00001 < Keep browsing..
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Catalogue: GRDC Updates
Data from the NSW Department of Primary Industries (DPI) long-term rotation experiments in northern NSW showed a positive effect of no-tillage on productivity and N2 fixation of chickpea (Felton et al. 1998; Marcellos et al. 1998; Herridge et al. 1998)... The difference between N2 fixation of chickpea and fababean is highlighted in Table 2, using data from the NSW DPI long-term rotation experiments and commercial crops in northern NSW... One of the objectives of the long-term no-tillage experiments of NSW DPI (Felton et al. 1998) was to compare chickpea and fababean in terms of N2 fixation and rotational benefits...
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Catalogue: GRDC Updates
Wheat can be affected when the canopy air temperature reaches 3.5 C (Woodruff unpublished), with damage increasing as the temperature falls further (Woodruff et al. 1997)... Yield declines of as much as 16% for each week that flowering is delayed past the optimum time have been reported (McDonald et al. 1983; Woodruff and Tonks 1983)... Optimum flowering time and maximised yields are achieved, in the long term, when a compromise between the effects of frost and drought is reached (Woodruff and Tonks 1983)...
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Catalogue: GRDC Final Reports
Most of the weed seedbank remains on the soil surface where exposure to light could have an important in uence on the germination behaviour of B. diandrus and B. rigidus... Across the experiment, germinability of B. rigidus from the in-crop habitat was found to be slow and incomplete, and populations of B. rigidus collected from Minlaton and Warooka on the YP showed no germination at all in light/dark conditions at any of the tested time-points (Fig. 1)... In summary, strong differences in light/dark germinability were observed in the collected populations of B. diandrus and B. rigidus right through until the end of the growing season (end of September), with B. rigidus germination never exceeding 40%...
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Catalogue: GRDC Updates
Nitrogen fixation activity of legumes is strongly linked to productivity and suppressed by soil nitrate... Data from the NSW Department of Primary Industries (DPI) long-term rotation experiments in northern NSW showed a positive effect of no-tillage on productivity and N2 fixation of both chickpea and fababean (Felton et al. 1998; Marcellos et al. 1998; Herridge et al. 1998)... Nitrate levels for Year 2 are after a 6-month summer fallow and for Year 3 are after an 18-month summer-winter-summer fallow (source: unpublished data of W. Felton, H. Marcellos, D. Herridge, G. Schwenke and M. Peoples)..
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Catalogue: GRDC Updates (West)
Soil acidity, water repellence and root disease have been shown to reduce crop access to soil P and where these constraints are present yield responses to fertiliser P have occurred even where soil test P levels are classed as sufficient... Recent research has shown that the majority of soils tested from the Western Australian cropping area have a sufficient level of soil phosphorus... Recent work has shown that where soil pH (CaCl2) is less than 4.6, moderate water repellence occurs (WDPT > 4 minutes) or root disease is present, crop access to soil P can be restricted and the efficiency of use of P fertiliser is less than treatments where these constraints do not exist...
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Catalogue: GRDC Publications
The stubble management decisions each of these growers made in 2010-2011 were unique to the individual and were influenced by the combination of experiences, cropping systems, agronomic and logistic challenges, and commitment to full stubble retention... The value of grazing crop stubbles to farm profitability was overestimated by the ME value of the intake the value of grazing crops cannot be predicted using energy intake from stubble... Finally the burning of stubbles also contributed to weed 26Australian Glyphosate Sustainability Working Group, Australian Herbicide Resistance Institute (2013), 9 Oct 2013...
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Catalogue: GRDC Final Reports
Clinton Revell (Group Leader, Pasture Science).. Preliminary economic analyses for use of new serradella and biserrula varieties indicate increases in profit of between $13 and $71/ha on a typical WA wheatbelt farm... The first variety, Cadiz , has been widely adopted...
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Catalogue: GRDC Publications
H. marinum is widely referred to as sea barley grass around the world, and H. hystrixis known as Mediterranean barley grass... Conditions that favour germination and establishment The seed of common sowthistle can germinate at temperatures in the range 5 C to 35 C. Germination is ultimately determined by moisture availability, as a moist environment is preferred... There is a high proportion of seedling emergence from shallow seed sources, whereas more deeply buried seeds remain dormant and long-lived with a half life estimated at 10 years...
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Catalogue: GRDC Publications
Assuming a single soil evaporation parameter to benchmark water use efficiency is a very coarse simplification, and possibly the main source of error in estimating water use efficiency using the French and Schultz approach... Selecting a variety to match to a time of sowing so that flowering occurs during the flowering window is an important management decision to improve yield and water use efficiency... The effect of sowing rate on water use efficiency in winter cereals is strongly influenced by the amount of soil moisture leading into spring...
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