GRDC Grains Research Update Walpeup 2018
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Cereal stubble should be thought of as a source of carbon (C) for microbes, not as a source of nitrogen (N) for crops. In no-till systems, only approximately 6% of the N requirement of crops is derived from the stubble. • Nitrogen tie-up by cereal residue is not just a problem following incorporation — it occurs in surface-retained and standing-st...
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Insecticide resistance issues continue to outpace novel control options. • Redlegged earth mite (RLEM): o Resistance in RLEM has been detected for the first time in eastern Australia. o Synthetic pyrethroids (SPs) are completely ineffective against SP-resistant RLEM populations, while some efficacy remains for organophosphates (OPs) against OP-res...
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Many of the farming system benefits of long fallow can only be quantified at the whole-farm level. • A long fallow-wheat rotation was more profitable than continuous wheat production and a chickpea-wheat rotation when the price of chickpeas was below $800/t. • If using fallow tactically, a good rule of thumb for the southern Mallee is to only sow w...
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Assessing the yield gap and the level of yield increase that the rainfall of a modified soil site can support, along with season specific effects, is an important step in assessing the risk of sand amelioration options. For higher cost interventions knowing the likely longevity of effect is essential. Deep soil disturbance has shown effects for up ...
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• Standard inoculation practices are unlikely to deliver satisfactory nodulation where extended dry conditions are combined with other stresses such as low pH. • Good nodulation can be achieved when dry sowing beans and lupins if inoculation rate is increased. Doubling the rate of peat inoculant significantly improved nodulation. • Granules are not...
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