Inorganic fertilizers have been an important tool to overcome soil fertility problems and are also responsible for a large part of the food production increases. found that the soil analyses and sitespecific studies also indicated that elements such as K, S, Ca, Mg and micronutrients (Cu, Mn, B, Mo and Zn) were becoming depleted and deficiency symptoms were observed in major crops in different parts of the country. Recently, according to the soil fertility map Ethiopia soil analysis data revealed that the deficiencies of most of the nutrients such as nitrogen (86%), phosphorus (99%), sulfur (92%), born (65%), zinc (53%), potassium (7%), copper, manganese, and iron were widespread in Ethiopian soils. Under such conditions, the application of multinutrient blended fertilizers is acknowledged for being able to enhance the productivity and nutrient use efficiency of crops. The low and unbalanced fertilizers application together with poor soil fertility management is presented as the major cause for low agricultural productivity in Ethiopia 1. Recently, the agricultural extension program has promoted a blanket recommendation of 100 kg DAP and 100 kg urea/ha for all cereal crops and soil types but the actual application rate is 65 kg DAP and 45 kg urea/ha. On the other hand, continuous application of DAP (Di-Ammonium Phosphate: 18%-46% N-P2O5) containing only Nitrogen (N) and Phosphorus (P) without due consideration of other nutrients is known to cause depletion of secondary and micronutrients. Such low levels of tef yield are widely believed to be due to low soil fertility caused by low and unbalanced fertilizer application 1. Nitrogen and phosphorus nutrients are the major tef yield-limiting factors, the unbalanced and un-optimal fertilization of Ethiopian soils by applications of only DAP and urea (N and P containing fertilizers) for a long period has led to severe nutrient mining of the agricultural soils, particularly when the entire crop biomass (grain and stover) is removed from the land. However, its grain yield productivity level is generally low and equal to 1.15 Mg ha–1. For this reason, about 2.8 million hectares of land are cultivated annually, covering more than 28% of the total area annually under cereals in Ethiopia. Trotter) is a versatile cereal crop concerning adaptation for the diverse agro-climatic and soil conditions. Weed Wheat Herbicide Evaluation Hadiya Introduction Therefore, applications of 200 kg ha-1 NPSB of blended plus 100 kg ha-1 of urea is economically advisable for farmers in the Halaba districts southern, Ethiopia and areas with similar agro-ecological and soil types for better tef production. However, the lowest net benefit was obtained from an unfertilized or control plot. The economic analysis revealed that the highest net benefit of 93885.9 ETB ha-1 with marginal rate of return (MRR%) of 143.8% was obtained in response to the application of 200 kg ha-1 of NPS-B blended with 100 kg ha-1 of urea. The maximum biomass yield (13.2 tone ha-1), grain yield (2.6 tone ha-1) was obtained from the application of 200 kg ha-1 of NPS-B blended fertilizer with 100 kg ha-1 urea. The treatments were arranged in a randomized complete block design and replicated three times. The study was aimed to determine the optimum level of NPS-B and by supplementing N from urea rates for maximum yield of tef production and to determine economically optimum level of NPS-B and by supplementing N from urea fertilizer. Inorganic fertilizers have been the important tools to overcome soil fertility problems and also responsible for a large part of the food production increases.
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