“Spatial Variability and Geostatistical Mapping of Soil Physical Properties in Abia State Southeastern Nigeria”. The NOUN Journal of Agricultural Research and Development (NJARD) 1, no. 1 (June 14, 2025): 108–119. Accessed July 7, 2026. https://journal.agric.nou.edu.ng/agricjournal/index.php/NJARD/article/view/16.