A preliminary look at the potential for variable rate fertilization for rolling land in the Brown Soil Zone
We are reporting on one year of results of an experiment to evaluate the potential for variable rate application of N, P, and seed to increase the economic returns for stubble-seeded spring wheat on rolling landscapes in the Brown soil zone. There was little yield response to either P or seeding rates and no important differences in the response by landscape position. There was a good yield response to N and the response was greater on the lower slopes than the upper slopes. However, a simple economic analysis showed that there was no economic advantage to varying the N rate by landscape position and, in fact, an economic disadvantage to varying N rate when using a single N-P fertilizer blend.
Soils and Crops Workshop