A. D. Abhinav, G. P. Leelavathy, B. Vajantha, G. P. Rao, and M. V. S. Naidu, “Fertiliser recommendation maps based on soil test crop response for important crops of Upparapalli village of Tirupati district, Andhra Pradesh”, Plant Sci. Today, vol. 13, no. sp1, Mar. 2026.