Department of Crop Physiology and Biochemistry, C. S. Azad University of Agriculture & Technology, Kanpur, India
Summary Efficiency of N utilization of three wheat varieiies, viz., Sonalika, Kaiyansona and UP 301 was assessed at five rates of N (0, 30, 60, 90 and 120 kg/ha) through field experiments conducted over a period of three years (1969/70 to 1971/72) at Kanpur, India. It was found that Kaiyansona utilized N most efficiently and yielded the highest followed by Sonalika and UP 301. On an average, every kg of N absorbed by Sonalika, Kalyansona and UP 301 produced approximately 16, 18 and 9 kg grain, respectively. The pattern of fertilizer-N utilization by wheat varfeties varied with the experimental season while their relative productive efficiencies remaineo essentially the same in each year and were more closely related to their yielding ability. Productive efficiency, therefore, appears to be the better criterion for judging the yield potential of different crop varieties.
