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Applying Nitrogen - using treatment maps
For growers equipped with GPS Variable Rate Technology (VRT) on the fertiliser spreader, the treatment map is converted into the correct file format and then simply imported into the control system electronically.
If VRT equipment is not available, advice is given to identify the appropriate equipment or a suitable specialist contractor. The N-Map team also have available on loan, a limited number of GPS enabled PDAs (Personal Digital Assistants) which will enable the fertiliser to be applied using a conventional spreader, by varying rates manually following prompts from this equipment.
Benefits
Kemira GrowHow Winter Wheat Trials 2004 - 2007
% yield increase from variable rate nitrogen
when compared to flat application
when compared to flat application
All fields
High variability fields
Where a 20 hectare field shows large variability, and a 10% yield gain, and making use of a second image, the outlay of £262 can be expected to give a benefit of £2275, or 8.7:1