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Western Australia | we have been using 9" for some years but will be going to 10" with a new airseeder. Depending on where your farm is here, spacing goes up to 18". Much talk about losing yield as spacing goes up, but in the northern and eastern areas of WA, moisture is the deciding factor and the wider rows allow the wheat to grow out in to the moisture as the season dries out.
this site shows the result of competition with annual ryegrass in narrow spacings
http://www.agric.wa.gov.au/PC_91239.html
this gives the results of different row spacings on yield
http://www.agric.wa.gov.au/objtwr/imported_assets/content/fcp/farmi... | |
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Wide Row Spacings in Wheat?????/
