HAZARIKA, S, and A N GANESHAMURTHY. “Long-Term Management Effects on Spatial Variability of Quality Characteristics of Soils under Guava (Psidium Guajava) and Sapota (Manilkara Achras) Orchards in South-Western Climate of India”. The Indian Journal of Agricultural Sciences, vol. 81, no. 2, Feb. 2011, https://epubs.icar.org.in/index.php/IJAgS/article/view/3989.