Weed herbicide resistance is one of the most serious management issues ratedfby growers, agronomists and researchers . In Eastern Canada at the top of that list is glyphosate-resistant fleabane (GRFB). First identified in southern Ontario in 2010, GRFB has spread like wildfire across Ontario and is now identified in other areas including Quebec. Fleabane seeds are small, airborne, and stick to clothing, equipment, animals. A single mature plant can produce up to 250,000 seeds/plant. Most fleabane biotypes are glyphosate-resistant, but other biotype herbicide resistance to group 2, 2 & 9, and 22 exist.Good control options exist in corn and wheat, but is problematic in soybeans. Article-OGF: https://b.link/GRFB_oNTFARM Ont Diagostic Day presentation: https://b.link/Sikkama_GRFB Research report- Dr Peter Sikkema, RCAT : https://b.link/Sikkema_GRFB
Manitoba Agriculture has developed a simple Phosphorus (P) spreadsheet calculator that allows users to input yield information and applied P during a rotation. A P balance is determined based on crop removal values, to show if soil P is being built, maintained or depleted. Phosphorus from manure applied during a rotation allows users to balance P over cropping cycle.
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Declining soil test phosphorus in the praries has increased interest in pushing P rates higher, following a 4R approach. Where high rates of P are required, side-banding of most or all of fertilizer P should be side-banded. Seed placed P did not provide a better canola crop response even at low rates compared to side-banded. More