MAP + AS is a common P and S fertilizer blend used in canola-growing regions of North America.
Canola is very sensitive to seed placed in close proximity to P and S fertilizers. Conventional P and S fertilizers increase seed damage due to ammonium nitrogen and especially due to the high salt index of AS.
MicroEssentials® S15® contains N, P and S fused into one nutritionally balanced granule, and the estimated salt index is lower (21.1) compared to AS (68.3).
Crop: Canola (Brassica napus)
Locations: 17 locations across the U.S. and Canada United States – ND Canada – AB, MB, SK
Data Source: Field studies conducted by third-party, independent researchers.
Experimental Design: Small-plot RCBD with 4 replications.
N Rate: As recommended and balanced across all treatments.
P Rate: 0, 17, 33 and 50 lbs P₂O₅/ac
K Rate: Applied to entire trial area based on soil test.
S Rate: Balanced at each P₂O₅ rate - 0, 7.7, 15 and 22.7 lbs S/ac.
Application Timing and Method: Fertilizer was applied with the seed at planting.
MicroEssentials® S15® outyielded MAP + AS by 1.7 bu/ac at 33 lbs and by 2.6 bu/ac at a 50-lb P₂O₅ rate across all locations.
MAP + AS had statistically significant lower plant populations than MicroEssentials® S15® at 17- and 33-lb P₂O₅ rates and numerically lower at the 50-lb P₂O₅ rate.
MicroEssentials® S15® can successfully increase canola yields over MAP + AS when applied at the same P₂O₅ rate.
These results demonstrated the additional seed safety that can be achieved with MicroEssentials® S15®.