K.P. SURESH NAIK, N. KRISHNAMURTHY and C. RAMACHANDRA (2001) “Effect of nutrient sources on grain yield, methane emission and water productivity of rice (Oryza sativa) under different methods of cultivation”, Indian Journal of Agronomy, 60(2), pp. 249–254. doi:10.59797/ija.v60i2.4445.