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Fluid Journal : Fluid Journal 1999-2001
3 Fluid Journal Spring 2000 germinating seed exposure to fertilizer. However, the negative effect of seed row application was large in comparison to the other placements considered, regardless of fertilizer form. Yield. Dry matter yield at both the seedling and flowering stages was reduced when placing the fertilizer blend in the narrow seed row. This negative response carried through to harvest grain yield (Figure 2). Spreading the seed and fertilizer under the 4-inch sweep minimized the negative effect of seed-placed fertilizer on final grain yield. Barley at Brandon Germination. Barley showed a similar response to wheat at Melfort. Fertilizer placed in a narrow band with the seed reduced crop emergence, as well as flowering dry matter yield. Yield. Unlike Melfort, negative effects at germination carried through to final grain yield and thousand seed weight. While no significant fertilizer form by placement interaction was recorded for grain yield, placement of dry fertilizer in a narrow band with seed produced 12 bu/A less than a seed- placed fluid. Thus, it would appear the negative effects of dry urea were greater than UAN when placed close to the seed. Spreading under a 4-inch sweep significantly improved crop response, particularly for the dry form. Canola at Brandon Germination. Wet soil conditions at seeding were not conducive to the establishment of a good crop. Seedling numbers were very low---even with the unfertilized check. Regardless of fertilizer source, placement in either a narrow three-quarter-inch band or under a 4-inch sweep significantly reduced emergence (relative to check) at both 3 and 5 weeks after seeding. Yield. By the time flowering biomass samples were collected, only seed placement in narrow bands continued to show negative effects, which also showed in final grain yield (Figure 3). Procedures Soil was Black Clay Loam at both the Melfort and Brandon sites. Seeding at the Melfort site was on May 29th and at Brandon on June 11th. Site conditions were very wet at Brandon in 1999 due to an extended period of heavy rains. This resulted in delayed seeding. Fertilizers. Fluids were a blend of 28- 0-0 + 10-34-0 + 15-0-0-20. Dry were a blend of 46-0-0 + 11-51-0 + 20-0-0-24. Nutrient rate. At both Melfort and Brandon, N was applied at 15 lbs/A, P at 18 lbs/A, and S at 9 lbs/A. Dr. Johnston is currently Western Canada Director of the Potash and Phosphate Institute of Canada.
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