The effect of pulse crop rotation and controlled-release urea on the N accumulation and end-use quality of CWRS wheat
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Spring wheat was grown at Carman in 2000 and 2001, and at Brandon, MB, in 2001, on field pea and flax stubble at three rates of N (0, 30, and 90 kg N ha-1) supplied as ammonium nitrate (AN) or controlled release urea (CRU), a polyurethane-coated urea. Wheat was grown in 2000 and 2001 at Swift Current, SK, on field pea and durum stubble at three rates of urea N (34, 50, and 78 kg N ha-1) based on soil test recommendations. Wheat grown on field pea stubble (P-W) had higher protein content (PC) than wheat grown on flax/durum stubble (F-W) at four of the five sites evaluated. Contrary to expectations, post-anthesis apparent net mineralized N and proportion of total N uptake were higher for F-W compared to P-W at the Carman 2000 and Brandon 2001 sites. Differences between fertilizer N sources were minor. Breadmaking quality of the wheat end-use quality was also assessed. At the same flour protein content (FPC), P-W had a shorter Mixograph dough development time, work input-to-peak, dough strength index, and breakdown resistance, and also tended to be more extensible than F-W.
annual grain legumes
fertilizer N source
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