The experiment was laid out at BARS, Kohat in RCB design with seven different fertilizer levels viz. 000, DAP+ UREA+ POT sulfate,DAP + Amm: sulfate +POT: sulfate,NP+UREA +POT: sulfate, NP+ amm:sulfate + POT: sulfate, SSP +UREA+ pot: sulfate, SSP+ amm:sulfate+ POT: sulfate @90-60-30, N, P2O5, K2O Kg/ha replicated three times. Prior to fertilizer application, a composite soil sample was collected and analyzed for various fertility parameters. The data about the effect of different sources of fertilizers on KT (2000) were recorded. The crop was harvested on 08-05-2012. The net plot harvested was 5m² for recording yield data. The grain yield data was subjected to statistical analysis by computing analysis of variance and employing DMRT for comparison of means using MSTAT-C.

The physico-chemical analysis of composite soil sample indicated that the experimental site had pH value of 7.44 with electrical conductivity of 0.14 d S/m. Soil was alkaline, strongly calcareous (21.25% CaCO3), deficient in organic matter, nitrogen & phosphorus and adequate in potassium. It has no problem of salinity and is clay loam in texture. (Table 1)

 The grain yield was significantly increased due to different fertilizer combinations (Table SS-1.2). The highest grain yield of 2133 kg ha^-1 was recorded by applying NP+UREA+K2SO4 @ 90-60-30 kg ha^-1 followed by 1933 and 1900 kg ha^-1 obtained by applying DAP+AMM sulfate+ POT sulfate combinations and DAP+URAE+K2SO4combinations respectively. The difference between the treatment No. 2, 3 and 4 was not significant, while these treatments were significantly different from the treatment No. 5, 6 and 7. The lowest grain yield of 1200 kg ha^-1 was recorded in the control treatment. So, it was concluded that T4: NP+URAE+ POT sulfate combinations@ 90:60:30 Kg/ha can be recommended as a suitable combinations to obtain highest grain yield under the agro climatic conditions of Kohat. The results are in close association with Geleto et al., (1995) and Ayoub et al. (1994).

 CONCLUSION

NP+URAE+ POT sulfate combinations@ 90:60:30 Kg/ha can be recommended as suitable combinations to obtain highest grain yield under the agro climatic conditions of Kohat.