A comparison of no-till winter wheat response to seed-placed and broadcast nitrogen fertilizer placement
Peer Reviewed StatusNon-Peer Reviewed
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Winter wheat (Triticum aestivum L.) can be successfully overwintered in most regions of the Canadian prairies if it is no-till sown into standing stubble immediately after harvest of the previous crop. Soil nitrogen (N) is usually deficient in this production system and N fertilization is necessary to optimize yield and maintain minimum quality standards. In the present study, the effect of seed-placed (SP) , early spring broadcast (BC), and SP+BC combinations of ammonium nitrate fertilizer (AN) on winter survival, grain yield, and protein production of winter wheat was investigated in 15 field trials conducted over a wide range of soil types and environmental conditions in Saskatchewan. Ammonium nitrate fertilizer placed in a 20 mm wide band with "Norstar" winter wheat seed produced average grain yield-N responses for 67 and 101 kg N ha-1 treatments that were only 86 and 70 % of comparable BC treatments, respectively. Average grain protein yleld-N responses for the 67 and 101 kg ha-1 SP N treatments were 86 and 73 % of comparable BC treatments, respectively. Changes in grain protein concentration due to increased rate of SP N were small. Similar grain and grain protein yield responses for 34 kg N ha-1 SP and BC treatments indicated that AN could be seed placed at low rates without reduced N-use efficiency. However, significant reductions in winter survival potential in all trials where differential winter-kill occurred suggested that even rates as low as 34 kg N ha-1 SP AN should be avoided when cultivars with marginal winter hardiness are utilized.
Part OfSoils and Crops Workshop
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