204-16 Canola Grain Yield Response to Split Applied Nitrogen in Carrington, North Dakota.
Poster Number 115
See more from this Division: U.S. Canola Association Research ConferenceSee more from this Session: Canola Research Poster Session
Tuesday, November 4, 2014
Long Beach Convention Center, Exhibit Hall ABC
This study was conducted in 2013 to evaluate response of canola (Brassica Napus L.) seed yield to split N fertilizer at the NDSU-Carrington Research Extension Center, ND. One-time application of N was made with uncoated urea either at planting at 0, 60, 105, 150 lbs N A-1 (0, 67, 118, 168 kg N ha-1), or as top-dress at 5-leaf growth stage at 90, 135, 150 Lbs A-1 (101, 151 and 168 kg N ha-1). Split treatments consisted of total N at 105, 150 180 lbs, applied at planting and as top-dress at the split rates of 60/45, 60/90, 105/45, 105/75 Lbs A-1 (67/50, 67/101, 118/50, 118/84 kg ha-1). AgrotainTM-coated urea (ACU) was also applied as a single dose at planting at 150 Lbs A-1, or at 5-leaf stage at 135 and 150 Lbs A-1, and in split at 45/90 and 105/45 Lbs A-1. The experiment was conducted as a randomized complete block design with four replicates. Leaf tissue N was assessed at 4-5 leaf stage just before fertilizer application. Results from pairwise comparisons (DMRT) showed yield differences were significant (p<0.05) between only the 105/45 lbs N split treatment (2454 Lbs A-1 yield) and the check (1589 lbs ha-1). Yields declined by 89 Lbs A-1 from 90 to 135 Lbs A-1 as single mid-season un-coated urea application. Additional decline of 8 kg ha-1 was observed when urea N rates increased to 150 lbs N. AgrotainTM-coated urea treatments on the other hand increased yields by 108 Lbs A-1 with single mid-season N application of 135 lbs compared to the 150 lbs N. Mid-season drought from mid-June to August likely explains overall low significant responses. Oil was inversely related to N rates. Despite high numerical yield differences, gross margins did not justify the costs over single application rate applications.
See more from this Division: U.S. Canola Association Research Conference
See more from this Session: Canola Research Poster Session