Background and Objective: Soil fertility depletion and soil acidity are critical problems for maize (Zea mays L.) production in western Ethiopia. Because of this, a field experiment was conducted on acidic Nitisols of the Assosa area to investigate the response of maize to different blended fertilizer rates and types. Materials and Methods: The treatments consists of control, three rates of N and P (92/46 , 115/57 and 138/69 N/P 2 O 5 kg haG 1 ) and two blended fertilizers with three rates (100 kg NPSB+73.9 kg N haG 1 , 150 kg NPSB+110.8 kg N haG 1 , 200 kg NPSB+147.8 kg N haG 1 , 100 kg NPSZnB+75.1 kg N haG 1 , 150 kg NPSZnB+112.6 kg N haG 1 ) and 200 kg NPSZnB+150.2 kg N haG 1 . The experiment was laid out as a Randomized Complete Block Design with three replications. Results: The results revealed that fertilizer types and rates significantly (p<0.01) affected grain yield, stover yield and harvest index. However, there was no significant difference between the two blended fertilizer types (NPSB and NPSZnB). The highest grain yield (7056.2 kg haG 1 ) was recorded with 200 kg NPSZnB+150.2 kg N haG 1 application. Blended fertilizers had improved nutrient concentration and uptake of maize. Application of 150 kg NPSB+110.8 kg N haG 1 recorded the highest marginal rate of return and net benefit. Conclusion: The study demonstrates high improvement in grain and stover yield and nutrient uptake of maize in response to blended fertilizers implying that N, P, S, Zn and B are deficient in Assosa soils, hence external application of these nutrients are vital as a blend for sustainable maize production.
Purpose: To evaluate the blended fertilizer formulas types, under unlimed limed condition of Asossa acid soil on soybean in Benishagul Gumuz of Ethiopia. Methods: Two factorial RCB design with three replications was used in the investigation. Five types of blended fertilizer formulas were tested under limed and unlimed condition in Factorial Randomized Complete Block Design. Lime and blended fertilizer types were used as factor. The amount of lime that was applied at each location was calculated on the basis of the exchangeable acidity, bulk density and 15 cm depth of the soil. One mole of exchangeable acidity would be neutralized by an equivalent mole of CaCO3. Accordingly, the amount of lime for this particular activity would be uniformly applied for all plots at 1.5 times of the exchangeable acidity (Equation 1) and incorporated in to the soil a month before seed sowing. Results: The effects of applied lime (CaCO3) and fertilizer types on growth and yield components of soybean were non-significantly (P>0.05) influenced except 100 seed weight, whereas the lime by blended fertilizer types interaction effects were not-significantly (P>0.05) affect all growth and yield components of soybean (Table 2). The highest plant height (71.58 cm) was obtained from NPKSZnB (Formula 5 modified) fertilizer type, however statistically non-significant from the other treatments. Conclusion: The partial budget analysis indicated that, it was not necessarily based on the highest marginal rate of return, rather based on the minimum acceptable marginal rate of return and the treatment with the high net benefit, relatively low variable cost together with an acceptable MRR becomes the tentative recommendation. Therefore we recommend the treatments (100 kg /ha NPSB) that have acceptable marginal rate of return, relatively high net benefit and relatively small total cost of production for soybean production in Asossa zone.
A field experiment was conducted on Nitisols of Asossa Agricultural Research Centre during 2017/18 to 2018/2019 cropping season toinvestigate the response of yieldpartial budget analysis to biofertilizer rates.The N fertilizer treatments considered in the study consisted of six levels (rates) of biofertilizer, one nationally recommended inorganic N and negative control of N.The treatments consists of: 125 g ha-1 (T1), 250 g ha-1 (T2), 500 g ha-1 (T3), 625 g ha-1 (T4), 750 g ha-1 (T5), 900 g ha-1 (T6), negative control (T7) and 18kg N ha-1. The treatments were laid out as a Randomized Complete Block Design with three replications.The analysis of variance revealed that bio-fertilizer rates significantly (P < 0.01) affected grain yield at Begi district, while non-siginificant (p<0.05) at Asossa district. The maximum (3483.7 kg ha-1 and 1750.9 kg ha-1) grain yield was recorded from 500 g ha-1bio-fertilizer at Begi and Asossa district respectively. The application of 500 g ha-1biofertilizer had the highest net-benefit of 20850.8 ETB, followed by 125 g ha -1biofertilizer which also had a total of 20196.8 ETB net benefit at Asossa district, while the application of 500 g ha-1biofertilizerhad the highest net-benefit of 41644.4 ETB, followed by 125 g ha-1biofertilizer which also had a total of 38315.6 ETB net benefit at Begi district. The application of 500 g ha-1bio-fertilizer ha-1 had highest net benefit. Therefore, we recommended the treatment 500 g ha-1since it produced high marginal rate of return, high net benefit and relatively small total cost of production, for soybean production in Begi and Asossa area.
A field experiment was conducted on Nitisols of Asossa Agricultural Research Centre during 2017/18 2018/19 cropping season to investigate the response of yield, partial budget analysis of ground nut varieties to bio-fertilizer and inorganic nitrogen. Two locally suitable varieties 4 groundnut rhizobial strains with control and 18 kg N ha-1, totally 12 treatments had combined in factorial RCBD. TSP fertilizer was applied uniformly to all plots at 46 kg P2O5 ha-1. The treatments consists of: two Varieties of groundnut (V1= Muniputer V2= Babile 2) and 4-strains with 18 kg N ha-1 and uninoculated (control) factorial treatment combination were tested. Analysis of variance for two factors randomized complete block design (Table 1) revealed highly significant difference (P < 0.001) due to the main effects of rhizobia and verities for the means of seed yield. On the other hand the interaction effects of rhizobia and varieties had non-significant (p>0.05) for the means of seed yield, nodule dry weight and straw dry weight. The highest (186.5) nodules per plants were recorded from the interaction effect of Dibate moderate and Maniputer variety, while less nodules per plant (76.25) were produced by Dibate moderate with Babile variety. The Dibate 2 rhizobia had the highest net-benefit of 67,655 Ethiopian birr. The lowest net benefit was obtained by the application of the Dibate moderate and none inoculant. The profitability of the study showed that application of Moderate 2 rhizobia which provided the relatively high net benefit (67,655 ETB), was recommended to apply bio fertilizers. The % MRR between any pair of undominated treatments denotes the return per unit of investment in fertilizer expressed as a percentage. Economic analysis revealed that maximum marginal rate of return was recorded with application of Dibate 2 (9257.2%). So we could be recommended Dibate 2 strain for ground nut production in Asossa district. The best recommendation for treatments is not necessarily based on the highest marginal rate of return, rather based on the minimum acceptable marginal rate of return and the treatment with the high net benefit, relatively low variable cost together with an acceptable MRR becomes the tentative recommendation.
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