K ASHOK KUMAR, S NEELIMA, P MUNIRATHNAM, and A S R SARMA, “Influence of NPK fertilization on growth, yield and economics of sunflower (Helianthus annuus L.) varieties and hybrids: INFLUENCE OF NPK FERTILIZATION ON SUNFLOWER”, J. Oilseeds. Res., vol. 30, no. 2, Dec. 2013, doi: 10.56739/jor.v30i2.142923.