drought, fertilizer carryover, nitrogen fertilizer, nitrate soil test
Nitrogen fertilizer not used due to drought conditions will be directly available for next year’s crop. The amount remaining can easily and accurately be measured with the nitrate soil test. The soil must be sampled to a two foot depth, however, to get an accurate nitrate measure of residual available nitrogen.
Gerwing, James R., "Fertilizer Carryover After Drought" (1988). SDSU Extension Extra Archives. 258.