VENUGOPALAN, M V, and D BLAISE. “Effect of Planting Density and Nitrogen Level on Canopy Spectral Reflectance and Productivity of Upland Cotton (Gossypium hirsutum)*”. The Indian Journal of Agricultural Sciences 71, no. 9 (April 29, 2014). Accessed July 4, 2026. https://epubs.icar.org.in/index.php/IJAgS/article/view/40248.