Ch. SRINIVASARAO, et al. “Direct and Residual Effects of Integrated Sulphur Fertilization in Maize (Zea Mays)- Chickpea (Cicer Arietinum) Cropping System on Typic Ustochrept”. Indian Journal of Agronomy, vol. 55, no. 4, Oct. 2001, pp. 259-63, https://doi.org/10.59797/ija.v55i4.4760.