Development of a Soil N Test for Fertilizer Requirements for Corn Production in Quebec
2011
Miransari, M. | Mackenzie, A.F.
Corn requires high nitrogen (N) fertilizer use, but no soil N test for fertilizer N requirement is yet available in Quebec. Objectives of this research were (1) to determine the effects of soil nitrate (NO3-)-N, soil ammonium (NH4+)-N, and N fertilizer rates on corn yields and (2) to determine soil sampling times and depths most highly correlated with yields and fertilizer N response under Quebec conditions. Soil samples were taken from 0- to 30-cm and 30- to 60-cm depths at seeding and postseeding (when corn height reached 20 cm) to determine soil NH4+ and NO3- in 44 continuous corn sites fertilized with four rates of N in two replications using a quick test (N-Trak) and a laboratory method. The N-Trak method overestimated soil NO3--N in comparison with the laboratory method. Greater coefficients of determination were observed for soil NO3--N analyses at postseeding compared with seeding.
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