Utpal Giri and Dipankar Saha, Niladri Paul, Ashim Datta. 2017. “Effect of Organic Matter Vis-a-Vis Humic Acid on Nutrient Availability and Yield Attributes of Rice – Mustard Cropping Sequence”. Journal of the Indian Society of Soil Science 65 (2). https://epubs.icar.org.in/index.php/JISSS/article/view/72900.