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Catalogue: GRDC Updates
Soil testing can be used to assess the likely nutrient constraints, but soil testing and soil test interpretation is not a precise science... To summarise a number of trial results, some sites had consistent increases in crop growth for crop-after-crop; others were more hit-and-miss... Nutrient rates used are 40 kg P (MAP or a fluid source), 200 kg K (SOP or MOP), and 40-80 kg S (SOA or ATS), with the high application rates designed to allow impacts to be followed through an extended crop rotation...
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Catalogue: GRDC Updates
Spray failures due to herbicide resistant weeds is increasing rapidly in most cropping regions... Every time a herbicide from the same mode of action group is used on a weed population, the selection pressure for resistance to that herbicide and to other herbicides with that same mode of action is increased... As resistance in a population is usually selected from a small number of individuals that have the resistance gene, the early stages of resistance often appear as small patches of weeds surviving a spray...
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