GUPTA, S. and D. K. SINGH, P.C.S.A. 2016. EVALUATION OF DIFFERENT SOIL EXTRACTANTS FOR ASSESSING BORON SUPPLY AND ESTIMATION OF CRITICAL LIMITS FOR SUNFLOWER IN SOILS OF SUNFLOWER IN SOILS OF SUNFLOWER IN SOILS OF KUMAON REGION OF REGION OF UTTARAKHAND. The Bioscan. 11, Supplement 1 (Feb. 2016), 449–454.