K. VANITHA, and S. MOHANDASS. “EFFECT OF HUMIC ACID ON PLANT GROWTH CHARACTERS AND GRAIN YIELD OF DRIP FERTIGATED AEROBIC RICE (ORYZA SATIVA L.)”. The Bioscan, vol. 9, no. 1, Nov. 2013, pp. 45-50, https://thebioscan.com/index.php/pub/article/view/579.