Stratification of Soil pH and the Spatial Variability in Oklahoma No-till Soils.

Soil pH is considered by many to be the master variable of soil fertility. During the 2014 and 2015 winter growing seasons, nine on farm no-till studies were established across North Central Oklahoma with varying soil types representative of the region to investigate the stratification and spatial variability of pH within each location. Stratified soil samples were collected to investigate the stratification and spatial variability of soil pH in no-till production. Site locations had an initial soil pH ranged from 4.6 to 6.8 across the nine locations. Upon investigation it was found that soil pH was stratified throughout the soil profile and that the spatial variability of soil pH was very large.