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- [3] Effect of sowing time , irrigation and nitrogen on grain yield and quality of durum wheat ( Triticum durum ). Singh A K,Jain G L. Indian Journal of Agricultural Sciences . 2000
- [4] Nitrogen response index as a guide to fertilizer management. Johnson G V,Raun W R. Journal of Plant Nutrition . 2003
- [5] Influence of time sowing and NP fertilization on grain quality of macaronl wheat ( Triticum durum ). Sanjeev K,Rajender K,Harbir S. Haryaana Agricultural University Journal of Research . 2000