Abstract
Nitrogen use efficiency by wheat was studied in field experiments for two years by supplying 120 kg Nha"1 to wheat on nutrient substitution basis from farmyard manure (FYM) and urea N in 0:100, 25:75, 50:50, 100:0 proportions. A control treatment (0:0) was also included without any nitrogen application. Nitrogen applied as 25% from FYM and 75% from urea produced significantly higher grain and straw yield than 0:100 and 50:50 treatments during both years. Substitution of N upto 50% by FYM produced wheat yield equivalent to that produced by 100% N as urea. Uptake of N and P was similar in the treatments receiving all N from urea and equal amounts from both N sources. However, appreciable increase in total N and P uptake was observed in 25:75 treatment as compared with 0:100 treatment. Highly significant linear correlation between wheat grain yield and the associated N uptake was recorded (r=0.986 & 0.997 in 1987-88 and 1988-89, respectively). Results indicated the possibility of improving N fertilizer use efficiency in calcareous soils by the integrated use of organic and mineral fertilizers
M. Mahmood-ul-Hassan, , S. M. Mian , M. Salim* . (1989) WHEAT RESPONSE TO FARMYARD MANURE AND UREA NITROGEN APPLIED IN DIFFERENT PROPORTIONS , The Journal Soil & Environment , Volume 4, Issue (3-4).
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