Alam, M.M., Ahmad, S.A., Khan, A. and Hoque, S. 2011. Nutrient uptake, harvest and addition by crops under different cropping sequences. Dhaka University Journal of Biological Sciences. 20, 1 (Nov. 2011), 81–89. DOI:https://doi.org/10.3329/dujbs.v20i1.8874.