OSR GAI
If checking GAI for fertiliser application, don't forget to check for crop lodging risk. The GAI tool can be used at crop growth stage 12-31 to assess crop nitrogen content. The GAI tool can be used at crop growth stage 30-31 to assess crop lodging risk.
Step 1 - Take a digital photograph
Take a digital photograph of the crop which is representative of the field and save this to your PC.
Step 2 - Upload your photograph
Browse and submit the photograph using the upload facility below, being sure to choose type of calculation required; assessment of 'Nitrogen Content' (from GAI) or 'Lodging Risk'.
Note: To gain the most accurate results from the tool, digital photographs should be taken directly above the crop. The area of crop photographed is not critical and a 1m x 1m is perfectly adequate. It is advisable to avoid taking photographs on sunny days as this may cause shadows. Note: An image taken using a camera phone is perfectly adequate. Taking at least 3 photographs per field and averaging the GAI is also advised to get the most accurate GAI reading.
Step 3 - Wait for your results to be calculated
The GAI tool will show 2 images; your original photograph and a processed black and green image to check that the tool is correctly identifying the green crop. If the tool is not correctly identifying the green crop, then it is recommended that another photo is taken a few days later in different light conditions.
Use this app to measure the GAI just before stem extension in late February.
GAI > 0.8 Caryx® 0.7 - 1.0 l/ha (Higher rate where tall variety / fertile site)
GAI > 2.0 Caryx® 1.0 - 1.4 l/ha (Higher rate where tall variety / fertile site)
If LLS is active, add tebuconazole 0.5 l/ha or prothioconazole 0.3 l/ha. Tebuconazole will have neglible PGR activity
Timing:
- From start of stem extension to yellow bud
- When spring growth has started, although a few cold nights won't matter
Why Caryx®?
Caryx® is the only OSR product to have achieved registration solely on its PGR ability and is a key OSR management tool.
| Reduces lodging and creates open canopy | +0.4 t/ha if lodging occurs Reduces height and lodging risk. ADAS aerial surveys show that 31% of crop lodges each year. |
| Creates an open canopy | +0.2 t/ha where no lodging Reduces apical dominance and allows more light into the canopy. 15 dose response trials showed a yield benefit of 0.21 t/ha of Caryx® at 1.0 l/ha vs untreated. |
| Improves rooting | +0.2 t/ha in a dry year Caryx® increases rooting at depth by 35%, protecting yield in a dry summer (this occurs every 2-3 years) |
| Dual ai activity | Mepiquat chloride & metconazole Copes with variable spring temperatures and across a wide growth stages range |
Caryx® is a registered trademark of BASF. Caryx® contains mepiquat chloride and metconazole. Use plant protection products safely. Always read the label and product information before use. This tool is compatible with JPEG (.jpeg, .jpg) images. If checking GAI for fertiliser application, don't forget to check again for your Sunorg Pro® needs.
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