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Alkaline

Catalogue: GRDC YouTube channel
91.829: Narrator: Soil testing is the standard mechanism used 95.56: to determine phosphorus levels and in the southern region particularly the Wimmera and 100.649: Mallee, the Colwell - P test has been widely used... 117.369: Roger Armstrong: One of the hypotheses we had initially was 119.95: that crops were accessing sources of phosphorus in soil, potentially mineral maybe organic 127.729: phosphorus pools that the soil test was not detecting but the crop could access itself 132.97: and meant the crop was not responding to Phosphorus fertiliser applications... 147.31: Jane Drinkwater Recent research undertaken using P isotopes 151.78: indicates that DGT better reflect the P pool in soil accessed by wheat plants than other 157.94: commonly used soil tests such as Colwell...
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Catalogue: Broadacre Field Crops DAFF QLD
Larvae are often present in lucerne but most contract a viral disease that normally controls helicoverpa numbers... Spotted alfalfa aphids are potentially the most damaging of the aphids while blue-green aphids and, occasionally, pea aphids usually decrease production without causing serious plant losses... A common insect pest in lucerne in many districts, adults cause only minor leaf damage but their larvae, which are creamy white in colour and roughly resemble maggots, feed on taproots and secondary roots of lucerne plants...
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Catalogue: Broadacre Field Crops DAFF QLD
Larvae are often present in lucerne but most contract a viral disease that normally controls helicoverpa numbers... Spotted alfalfa aphids are potentially the most damaging of the aphids while blue-green aphids and, occasionally, pea aphids usually decrease production without causing serious plant losses... A common insect pest in lucerne in many districts, adults cause only minor leaf damage but their larvae, which are creamy white in colour and roughly resemble maggots, feed on taproots and secondary roots of lucerne plants...
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Catalogue: Broadacre Field Crops DAFF QLD
Larvae are often present in lucerne but most contract a viral disease that normally controls helicoverpa numbers... Spotted alfalfa aphids are potentially the most damaging of the aphids while blue-green aphids and, occasionally, pea aphids usually decrease production without causing serious plant losses... A common insect pest in lucerne in many districts, adults cause only minor leaf damage but their larvae, which are creamy white in colour and roughly resemble maggots, feed on taproots and secondary roots of lucerne plants...
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Catalogue: GRDC Final Reports
Black point discolouration appears to be similar to enzymatic browning characteristic of plant tissues subjected to physical damage, which involves the oxidation of phenolic compounds present in plant tissues by polyphenol oxidase (PPO) or peroxidase (POX) and the transformation of the oxidation products to dark pigments... In order to determine differences in enzymatic activity of clean and black-pointed grains, and the suitability of black-pointed barley grain for use in malting and brewing, POX and PPO were measured during grain development using enzymatic activity assays and isoelectric focusing... Black point appears to be similar to the enzymatic browning characteristic of plant tissues subjected to physical damage, which involves the oxidation of phenolic compounds by polyphenol oxidase (PPO) and peroxidase (POX) and the transformation of the oxidation products to melanin-like black or brown pigments (Dicko et al., 2002)...
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Catalogue: GRDC Publications
In summary, 20 trials have now recently been undertaken across a number of seasons and locations in NSW. None of them have demonstrated S responses in yield or oil %. This does not exclude deficiency and yield penalties from occurring but does highlight that the frequency and the likelihood is not high... Delaying any action that has the potential to cease grain fill will see more seeds achieve their maximum size and improve yield... In summary there was no 'concerning' level of seed loss observed at any trial or timing, correlating well with the yield data...
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Catalogue: GRDC Publications
In summary, 20 trials have now recently been undertaken across a number of seasons and locations in NSW. None of them have demonstrated S responses in yield or oil %. This does not exclude deficiency and yield penalties from occurring but does highlight that the frequency and the likelihood is not high... Delaying any action that has the potential to cease grain fill will see more seeds achieve their maximum size and improve yield... In summary there was no 'concerning' level of seed loss observed at any trial or timing, correlating well with the yield data...
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Catalogue: NVT Online Papers
Canola is often windrowed to ensure all pods are mature at harvest... In summary, windrowing too early can result in lower yields and oil contents and too late will lead to shattering losses... Canola is sold into a deregulated domestic market and the responsibility of finding an acceptable price and arranging a buyer rests with the grower...
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Catalogue: GRDC Publications
Canola is often windrowed to ensure all pods are mature at harvest... In summary, windrowing too early can result in lower yields and oil contents and too late will lead to shattering losses... Canola is sold into a deregulated domestic market and the responsibility of finding an acceptable price and arranging a buyer rests with the grower...
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Catalogue: GRDC Media
Water logged soils can result in significant N loss through denitrification... Professor Grace says the first step in defining a nitrogen program is for growers to observe how their soils respond to rainfall to better understand how they are likely to lose nitrogen (see breakout box on types of N loss)... Previous work has shown that for every 1 kg of N lost as N 2 O, as much as 10-50 kg of N may be lost to N 2 ...
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