mg kg

" 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)...

Industry relies heavily on the organophosphorus insecticide dichlorvos # to disinfest grain in unsealed silos... Candidates were evaluated in the laboratory against a range of pests... None of the newer compounds or combinations evaluated in the project was capable of broad-spectrum control at reasonable application rates...

Industry relies heavily on insecticides to protect stored grain, but this is under threat from resistance... Subsequently an experiment was undertaken to determine the long-term efficacy of spinosad and residue levels during storage of treated wheat at 30 C. Spinosad efficacy was relatively stable during nine months' storage, with initial doses of 0.5 and 1 mg/kg giving 100% control of adults and progeny in all bioassays of wheat taken at intervals during storage... The results from this project and DAQ00009 reinforce how difficult it is to find protectants or protectant combinations to control all of the target species or resistant strains...

We in the north are still working out where and how best to use P in our fertiliser programs... The representation for different crop species, soil types and seasons is somewhat limited... GRDC Grains Research Update Goondiwindi, March 2014 Figure 3...

The interpretation of the values generated from those soil tests has remained a dark art and this short paper hopes to summarise 'where we are at' with the principles we use to interpret all those soil tests that have been increasingly adopted by industrious agronomists and producers... Considerably more work is required to improve the precision of these critical values, and to understand the mechanism behind the increase in those values where soil Na or Mg status is high... We have been working on a method to estimate the reserves of K available in each soil and the results of this research have been presented in previous Updates...

Maximise crop response to P applications.. To achieve this, farmers need to have accurate information at hand about the state of the soils prior to the purchase and placement of fertiliser... It is important to interpret the Colwell-P soil test results in association with the Phosphorus Buffering Index (PBI), which helps define to the availability of soil P - the higher the PBI, the more difficult it is for a plant to access P...

Maximise crop response to P applications.. To achieve this, farmers need to have accurate information at hand about the state of the soils prior to the purchase and placement of fertiliser... It is important to interpret the Colwell-P soil test results in association with the Phosphorus Buffering Index (PBI), which helps define to the availability of soil P - the higher the PBI, the more difficult it is for a plant to access P...

The deeper soil sampling to 30 cm improved the relationship for S canola but not for wheat where rate of S leaching and potential yield appear to be important... The aim of the paper is to define the soil test-grain yield response relationships for P, K, S and N with wheat, canola and lupin grown in WA... Soil N supply was calculated as amount of N extracted by soil test to depth of 45 cm plus predicted growing season N mineralisation based on levels of soil organic N (Anderson, unpublished data)...

Mortality and reproduction of Rhyzopertha dominica adults exposed for two weeks to grain treated with spinosad #, imidacloprid #, synergised pyrethrins and methoxyfenozide #... Mortality and reproduction of QRD788 adults exposed for two weeks to wheat treated with combinations of spinosad, s-methoprene and chlorpyrifosmethyl #.. Spinosad residues (mg/kg) on wheat treated with spinosad at 0.5 and 1 mg/kg and stored at 30 C. Results have not been corrected for recovery of 83%...