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Arable Farming
Cropping
Blackgrass chemical attack
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<blockquote data-quote="B'o'B" data-source="post: 7597465" data-attributes="member: 491"><p>Spring crops reduce bad BG, they don’t eliminate it. You only need one pathetic little BG plant per (approx) 20m2 in a spring crop to put you in the situation you are in with your winter wheat.</p><p></p><p>By far our worst field for BG here this year is in rye, which was peas last year and rye the year before that. The problem with rye is it is impossible to do a good job rogueing in it and it needs drilling a couple of weeks too early. Peas are also hard to rogue properly.</p><p></p><p>I read an article today saying how hybrid barley reduced seed returns to just 66g/m2 down from +400g/m2 in wheat. That’s all well and good but that is still a seed return of 660kg/Ha!!!!!! And what’s the TGW of BG? Let’s guess at 10g? So a rough estimate of 66,000 seeds/m2 returned in 1 year! In a “good crop” for reducing seed return!!!!</p><p></p><p>My policy is if I see a BG plant anywhere on the farm I spray 1m2 minimum out around it. In winter wheat I am winning the battle with nothing but a modest pre-em and a knapsack of glyphosate in May/June. In all other crops I am going slowly backwards at present. Because rye doesn’t like very much pre-em and wants drilling early. Peas are not very friendly to BG, but just enough slip under the radar to make things a little bit worse. (We found the same with linseed and WOSR both currently dropped from the planned rotation)</p><p>How many BG plants can you tolerate per m2? Answer = 0/m2 otherwise you are heading rapidly in the wrong direction!</p></blockquote><p></p>
[QUOTE="B'o'B, post: 7597465, member: 491"] Spring crops reduce bad BG, they don’t eliminate it. You only need one pathetic little BG plant per (approx) 20m2 in a spring crop to put you in the situation you are in with your winter wheat. By far our worst field for BG here this year is in rye, which was peas last year and rye the year before that. The problem with rye is it is impossible to do a good job rogueing in it and it needs drilling a couple of weeks too early. Peas are also hard to rogue properly. I read an article today saying how hybrid barley reduced seed returns to just 66g/m2 down from +400g/m2 in wheat. That’s all well and good but that is still a seed return of 660kg/Ha!!!!!! And what’s the TGW of BG? Let’s guess at 10g? So a rough estimate of 66,000 seeds/m2 returned in 1 year! In a “good crop” for reducing seed return!!!! My policy is if I see a BG plant anywhere on the farm I spray 1m2 minimum out around it. In winter wheat I am winning the battle with nothing but a modest pre-em and a knapsack of glyphosate in May/June. In all other crops I am going slowly backwards at present. Because rye doesn’t like very much pre-em and wants drilling early. Peas are not very friendly to BG, but just enough slip under the radar to make things a little bit worse. (We found the same with linseed and WOSR both currently dropped from the planned rotation) How many BG plants can you tolerate per m2? Answer = 0/m2 otherwise you are heading rapidly in the wrong direction! [/QUOTE]
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Blackgrass chemical attack
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