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crop sensor

Catalogue: GRDC Updates
Preliminary studies carried out as part of the project last season, sought to establish whether crop reflectance readings could be related to crop size and plant nitrogen uptake at the key timings for in-crop nitrogen application tillering to flag leaf emergence (GS22 - GS39)... Much of the work on wheat has been conducted in higher yielding irrigated scenarios following Sorghum so that soil nitrogen reserve is sufficiently depleted to ensure a response to nitrogen... Furthermore if a split nitrogen application during stem elongation (GS30 start of stem elongation followed by GS33 - 39 third node to flag leaf emergence) could be employed in the knowledge that it was not inferior to other N strategies, it would not only give a greater flexibility to respond to the season in terms of spring rainfall (for dryland growers), but would also allow the growth changes (e.g. NDVI "change map") to be recorded with crop sensors (on a spatial basis) following the application of the first dose...
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Catalogue: GRDC Publications
Influence of fungicide rate (mean of fungicide products - four site mean) Stem rust control assessed over the four trial sites revealed that using high rates was essential for the control of the disease, even if the fungicide had been applied prophylactically (before infection was visible in the crop)... Influence of cultivar resistance and fungicide application (Prosaro ) on yield and stem rust severity measured on the flag sheath 18 days after fungicide application at early dough (GS82) and assessed at mid dough - physiological maturity (GS85-90) - Bairnsdale, Gippsland, Victoria, 2010... The yield potential for the crop with no nitrogen applied is estimated at GS30 from the results of numerous of trials conducted in that region where NDVI at GS30 is divided by the number of growing degree days (GDD) greater than 0 C since planting, referred to as the INSEY units (in season estimate of yield)...
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Catalogue: GRDC Final Reports
Through a national series of 40 trials and 20 Soil 2 Grain workshops, this project generated a series of guidelines on the tactical use of agrichemicals and nitrogen (N) in cereals during stem elongation... Disease management outputs included the construction of a green leaf duration calculator for making better fungicide decisions, management guidelines for the use of foliar fungicides to control stem rust in wheat, stripe rust control in wheat varieties with adult plant resistance (APR) and powdery mildew in barley... Using a conservative 5% uptake (based on losses estimated by Murray & Brennan of crops with powdery mildew in WA and leaf rust susceptible barley in the northern region) these guidelines could increase margins by an estimated $5 million/year...
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Catalogue: Ground Cover
Nick Poole from the Foundation for Arable Research says new tools to fight leaf diseases and respond to crops' nitrogen needs could be worth hundreds of dollars a hectare to high-rainfall zone growers... PHOTO: Kellie Penfold New tools to fight leaf diseases and respond to crops' nitrogen needs have been developed for cereal growers in the high-rainfall zone (HRZ), following a three-year project by the Foundation for Arable Research... "For example, our previous research gave confidence to cereal growers to delay nitrogen and fungicide decisions until stem elongation," Mr Poole says...
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