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Catalogue: GRDC Publications
" Goondiwindi GRDC Grains Research Update Day 1 - Tuesday 4 th March Time Topic Speaker (s) 10:00 AM James Clark (Chair Northern Welcome Panel GRDC) 10:10 AM General plenary (Supported by North West Local Land Services) 10:10 AM 10:40 AM.. Overall, both models are acceptable for modelling soil evaporation over a range of soils and seasons provided accurate soil physical properties and starting water states are known... Overall, populations increased five times compared to before planting the summer crops, but remained below 250/kg soil (Figure 4)...
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Catalogue: GRDC Publications
GRDC Grains Research Update Goondiwindi, March 2014 as yields increase, i.e. the bug threshold for a 4t/ha soybean crop is twice that for a 2t/ha crop (Fig. 2), and similarly for mungbeans - see comparison between 1t/ha and 2t/ha crops (Fig. 3)... In summary, action thresholds for edible soybeans and mungbeans are set for bug populations predicted to damage 2% and 1.4% of seeds respectively... GRDC Grains Research Update Goondiwindi, March 2014 rule of thumb, aim to sample 5 widely-separated sites throughout a crop, with at least 4 x 1 m samples per site...
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Catalogue: GRDC Publications
The important factors in getting pre-emergent herbicide to work effectively while minimising crop damage are: to understand the position of the weed seeds in the soil; the soil type (particularly amount of organic matter and crop residue on the surface); the solubility of the herbicide; and its ability to be bound by the soil... Weed seeds will most likely absorb herbicide if the herbicide is at or below the seed in the soil profile... Only some of the mutations provide resistance to both groups of herbicides...
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Catalogue: GRDC Updates
At Merredin and Beverley in W.A east - west sowing gave 24% yield increase in cereals and a 37 to 54% suppression in weed biomass... Recent work with barley varieties shows there is as much difference between barley varieties as there can be between crop types... Figure 1 summarises a barley competition trial conducted at Trangie in 2013 and shows the capacity of different varieties to yield both with and without weeds and the yield loss incurred by weeds (oats)...
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