Systematic Evaluation of Precision Farming Soil Sampling Requirements
Precision farming soil sampling protocols must be sensitive to the fact that different objectives require different levels of precision and accuracy. A case study was used to demonstrate an approach for evaluating the impact of grid distance on spatial analysis and profitability. Specific findings from this study showed that: (i) based on semivariogram analysis, a 60-m grid did not produce reproducible semivariograms for Olsen P, K, and Zn, while a 60-m grid provided reproducible semivariograms for total N and C and pH; (ii) yields may have been enhanced in upper and lower backslope positions by P additions, while corn grain yields were not correlated to soil P in poorly drained areas or where an old feed lot was located; and (iii) profitability can be improve by just understanding nutrient variability and may not require variable rate fertilizer equipment or yield monitors.
DOI of Published Version
Clay, David E.; Carlson, C. G.; Chang, J.; Clay, S. A.; Malo, D. D.; Ellsbury, M. M.; and Lee, John, "Systematic Evaluation of Precision Farming Soil Sampling Requirements" (1999). Agronomy, Horticulture and Plant Science Faculty Publications. 224.