1. Abeykoon, V. (1992). Effectiveness of partially acidulated phosphate rock (PAPR) prepared from Eppawala rock phosphate. In Beri, V., M.R. Chaudhary, P.S. Sidhu, N.S. Pasricha, and M.S. Bajwa (eds.) Proceedings of the International Symposium on Nutrient Management for Sustained Productivity. Vol.2. pp.24-25. Ludhiana, India: Department of Soils, Punjab Agricultural University.
2. Acharya, C.L. and A.K. Biswas. (2002). Integrated nutrient management in pulse based cropping systems-Present status and future prospects. In Ali, M., S.K. Chaturvedi, and S.N. Gurha (eds.) Pulses for Sustainable Agriculture and Nutritional Security. pp.1-12. Kanpur, India: Indian Society of Pulses Research and Development.
3. Fertiliser, Plant Nutrient Management, and Self-reliance in
Agriculture
4. Ahmed, S. and S.M. Rahman. (1992). Management guidelines for micronutrient fertilization in Bangladesh soils. In Beri, V., M.R. Chaudhary, P.S. Sidhu, N.S. Pasricha, and M.S. Bajwa (eds.) Proceedings of the International Symposium on Nutrient Management for Sustained Productivity. Vol.2. pp.59-60. Ludhiana, India: Department of Soils, Punjab Agricultural University.