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Transformation of Fall-Banded Urea

Application Date, Landscape Position, and Fertilizer Additive Effects

^a Dep. of Soil Science, Univ. of Manitoba, 362 Ellis Bldg, Winnipeg, MB, Canada, R3T 2N2
^b Agriculture and Agri-Food Canada, Brandon, MB, Canada R7A 5Y3
^c Western Co-operative Fertilizers Limited, Calgary, AB, Canada

View larger version (30K): [in a new window]   Fig. 1. Effect of (a) application date, (b) soil temperature on date of application, (c) cumulative soil heat units, and (d) cumulative nitrification heat units on the percentage of recovered fertilizer N as NH4+in the soil using the final fall sampling period only (*** indicates significance at P = 0.001).

View larger version (25K): [in a new window]   Fig. 2. Effect of (a) cumulative soil heat units and (b) cumulative nitrification heat units in the fall on the percentage of recovered fertilizer N, with and without NBPT and DCD, as NH4+ using the final fall sampling period only [*, **, *** indicate significance at P = 0.05, 0.01, and 0.001, respectively; slope comparison: (a) P = 0.069 (not significant); (b) P = 0.02*].