Digital Commons Network^™

Precision Farming Protocols: Part 1. Grid Distance And Soil Nutrient Impact On The Reproducibility Of Spatial Variability Measurements, Jiyul Chang, David E. Clay, C. Greg Carlson, Douglas D. Malo, Sharon A. Clay, John Lee, Mike Ellsbury

Agronomy, Horticulture and Plant Science Faculty Publications

To determine temporal changes in soil nutrient status, reproducible results must be obtained at each time step. The objective of this paper was to determine the impact of grid distance on the reproducibility of spatial variability measurements. Soil samples from the 0 to 15 cm depth were collected from a 30 by 30 m grid in May 1995 in a 65 ha notill corn (Zea mays L.) field. Each bulk sample contained 15 individual cores, collected at sample points located every 11.4 cm along a transect that transversed 3 corn rows (57 cm). At each sampling point latitude, longitude, elevation, …