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Catalogue: Ground Cover
Map 1 and 2 showing rainfall deficiencies and minimum temperature deciles across Australia.. Dr Hayman says that although graingrowers who have been able to sow were concerned about the dry and cold winter, the real concern was rainfall and night temperatures over the coming spring, as the flowering time for wheat was the most sensitive phase for moisture stress and frost damage... The national June mean temperature was the equal fourth lowest in the post-1950 record...
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Catalogue: GRDC Updates
Over many parts of NSW the frost season length has broadened by as much as 40 days and the mean number of consecutive frost days has increase to 5 days... The spatial analysis shows much of the increase in frost frequency has occurred in August, although the date at which the last frost occurs has increased by as much as three weeks in some parts of eastern Australia (Figure 1)... Our research suggests that increases in number and change in the period of frost occurrence is driven by a long-term southerly shift in position and intensification of the band of high pressure typically located over central Australia in spring...
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Catalogue: GRDC Updates
While most of WA has seen increases of mean temperatures in the past 50 years, trends in mean spring temperatures varied by location... Sites with smaller trends in mean spring minimum temperatures had an increase in low temperature extremes (ie 'frost risk')... A small number of locations have experienced a slight increase in the length of the 'frost season', with the decade of the 2000s showing later dates of the last low temperature event...
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Catalogue: Ground Cover
The chance of a La Ni a developing in 2007 is thought to be higher than the long-term average, which is about one in five, or 20 per cent... La Ni a events tend to follow El Ni os; the 2006-07 El Ni o weakened somewhat earlier than normal giving time for a La Ni a to begin developing during the critical March to June period; and a large pool of cold sub-surface water remains in the central to eastern tropical Pacific Ocean and is starting to affect surface temperatures in the region... BOM climate meteorologist Grant Beard says that although central to eastern Pacific sea-surface temperatures have remained close to average during March, following the rapid cooling that took place during January and February, the remaining large pool of cold sub-surface water could indicate a La Ni a event...
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Catalogue: GRDC Updates (West)
Research by Larn McMurray (SARDI, South Australia) showed that lentils were very susceptible to metribuzin damage when cold minimum temperatures (below 5 deg C) were experienced in the five day period following spraying... To determine if the finding that 'metribuzin damages lentils when cold minimum temperatures occur' applies to lupins in Western Australia... Lupins were visually assessed for phyto-toxicity every metre along each plot...
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Catalogue: GRDC Updates (West)
Incidence of high temperature events during spring has increased... Sites with smaller trends in mean spring minimum temperatures had an increase in low temperature extremes (ie 'frost risk')... A small number of locations have experienced a slight increase in the length of the 'frost season', with the decade of the 2000s showing later dates of the last low temperature event...
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Catalogue: GRDC Updates (West)
Cold tolerance level varied between temperate and tropical rice varieties.. Long plots were used for the purpose of seed increase while maintaining pure seed status at sowing and harvesting... The results of the study provided some helpful insights regarding selection of varieties for cold tolerance...
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Catalogue: GRDC Updates (West)
P4/S9 and P2/S4 were the two most profitable sequences and, overall, the 'maximum profit - P4' philosophy had the highest mean gross margin... It is logical that those growers that have chosen to have no livestock will have no interest in trialling grazing crops... Overall, the data has indicated that for the biserrula inoculant all of the carrier's have difficulties in carrying enough live rhizobia numbers to adequately nodulate the legume hosts after 3-4 months of dry, hot soil...
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