Ishaya, S. K., and D. M. Lawal. “ANALYSIS OF SOIL NUTRIENT STATUS UNDER DIFFERENT CROPPING TYPES IN KARU LOCAL GOVERNMENT AREA OF NASARAWA STATE NIGERIA”. African Journal of Agricultural Science and Food Research, vol. 3, no. 1, Mar. 2022, pp. 51-63, https://publications.afropolitanjournals.com/index.php/ajasfr/article/view/108.