Effect of Mineral Fertilizer, Farmyard Manure, and Compost on Yield of Bread Wheat and Selected Soil Chemical Properties in Enderta District, Tigray Regional State, Northern Ethiopia

Abstract: Soil nutrient depletion as a result of continuous cultivation of the land without adequate additionof external fertilizer inputs is one of the major problems that constrain the yield of bread wheat andsustainable productivity of the soil in Tigray Regional State. A field experiment was conducted to elucidatethe effect of mineral nitrogen and phosphorus fertilizer (NP), farmyard manure (FYM), and compost on theproductivity of bread wheat and selected soil chemical properties. The treatments consisted of three breadwheat varieties (Kakaba, Paven 76, and Mekelle I) and eight fertilizer combinations [control (0, 0), blanketrecommended NP fertilizer (RNP) (41 kg N ha-1 + 46 kg P2O5 ha-1), 10 t ha-1 FYM, ½ of RNP (20.5 kg Nha-1 + 23 kg P2O5 ha-1) + 10 t ha-1 FYM, ½RNP (20.5 kg N ha-1 + 23 kg P2O5 ha-1) + 5 t FYM ha-1, 7 tcompost ha-1, ½ RNP (20.5 kg N ha-1 + 23 kg P2O5 ha-1) + 7 t compost ha-1, and ½ RNP (20.5 kg N ha-1 +23 kg P2O5 ha-1) + 3.5 t compost ha-1]. The experiment was laid out as a randomized complete block designin a factorial arrangement and replicated three times per treatment. Data were collected on yield and yieldcomponents of the crop and selected soil chemical properties, namely, contents of soil organic carbon (OC),available phosphorus (P), total nitrogen (TN), cation exchange capacity (CEC), soil reaction (pH), andelectric conductivity (EC). The results revealed that the yield and yield components of wheat significantly (P≤ 0.01) responded to application of the fertilizers. Combined application of 10 or 5.0 t ha-1 FYM with half ofthe recommended mineral nitrogen and phosphorus fertilizer (i.e., 20.5 kg N + 23 kg P2O5 ha-1) increasedgrain yield of the crop by 185 and 170%, respectively, over the control treatment. Similarly, combinedapplication of 7.0 or 3.5 t ha-1 compost with half of the recommended mineral nitrogen and phosphorusfertilizer (20.5 kg N + 23 kg P2O5 ha-1) increased grain yield significantly by 159 and 148%, respectively,over the control treatment. The highest net benefits of 37290 ETB, 33002 ETB, and 30835 ETB ha-1 withacceptable marginal rates of return were obtained in response to applying half of the blanket recommendedminer NP fertilizer (½ RNP) ha-1 + 5 t FYM ha-1 to Kakaba, Mekelle I, and Paven 76, followed byapplication of the full blanket recommended NP fertilizer (RNP) ha-1 and ½ RNP ha-1+ 5 t ha-1 compost. Itis, thus, concluded that combined application of half of the blanket recommended NP fertilizer (20.5 kg N +23 kg P2O5 ha-1) with 5 t FYM ha-1or with 3.5 t ha-1 compost led to the most economically optimum breadwheat yield as well as improved soil physico-chemical properties for sustainable production of the crop in thefuture. Analysis of the selected soil chemical properties at harvest indicated that, compared to the availablephosphorus and total nitrogen contents of the soil in plots to which no any fertilizer was applied (controltreatment), the total nitrogen and phosphorus contents of the soil to which 10 t ha-1 FYM and 7 t ha-1compost were applied increased by about 100% whereas that of organic matter increased by about 300%.The results indicate that the soils of the study area are deficient not only in mineral nutrients such as nitrogenand phosphorus but also in soil organic carbon and its constituents that are important to maintain soil qualityand health. This implies that there is a need for judicious soil ameliorative measures using both mineral andorganic fertilizers to enhance productivity of crops in the region