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Problem Low productivity due to N and P deficiency, P fixing acid soils High nutrient depletions

P. 30. 0. 30. Varieties. CS-20DK. 25. P. Degaga. 30. 0. Gebelcho. 20. Moti. Varieties. 1.0. Obse. CS-20DK. 15. Walki. Degaga. 0.8. Gebelcho. Moti. 10. 30. Obse. P. 0.6. Walki. 0. 25. 30. 0.4. 20. P. 1.0. 0. 30. 15. 0.8. 10. i. i. a. 0.6. K. e. k. o.

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Problem Low productivity due to N and P deficiency, P fixing acid soils High nutrient depletions

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  1. P 30 0 30 Varieties CS-20DK 25 P Degaga 30 0 Gebelcho 20 Moti Varieties 1.0 Obse CS-20DK 15 Walki Degaga 0.8 Gebelcho Moti 10 30 Obse P 0.6 Walki 0 25 30 0.4 20 P 1.0 0 30 15 0.8 10 i i a 0.6 K e k o t h l g o s D a c a b 0 M l W g O • Specific objectives • Determine nutrient depletion • Quantify BNF for faba bean • Identify genotypes for positive • soil N balance, P use efficiency • and grain yield potential • Assess extent of root • colonization by mycorrhiza • Investigate mechanisms of • enhanced P use efficiency • Evaluate rotational effects 2 e e - b S D e C G Varieties 0.4 i i K a o e k t l g h o s D a c b a 0 M l W g O 2 e - e b S D e C G Varieties Improved cereal production via N and P efficient legume genotypes in the Gilgel-Gibe catchment, Ethiopia Amsalu Nebiyu*, Pascal Boeckx** and Jan Diels*** *Jimma University, Ethiopia,**Laboratory of Applied Physical Chemistry (ISOFYS), Faculty of Bioscience Engineering, UGhent, Belgium, * * *Department of Soil and Water Management, KULeuven, Belgium • Problem • Low productivity due to N and P deficiency, P fixing acid soils • High nutrient depletions • High cost of fertilizers • General objective • Develop integrated nutrient management practices to increase productivity through promoting legume crop genotypes with enhanced BNF, P use efficiency and greater productivity Study area Materials and Methods • Activity 1 (2008/09) • Screening of faba bean (Vicia faba) • 16 genotypes screened for • Adaptability, Nodulation, Yield and agronomic performance • RCBD, 3 reps used, ANOVA & LSD0.05, for mean comparison • Activity 2 (2009/10) • BNF and P uptake studies • Farmer’s field trial at Dedo, RCBD, 3 reps • 2 factors: fertilizer (0, 30 kg-1 as TSP) and • genotype (six faba) • BNF, 15N natural abundance, wheat as reference • P Uptake and use efficiency Results Table1. Grain yield and yield components of 16 faba bean varieties evaluated at Jimma and Dedo, 2008/2009 Table 2. Effect of variety and P application on Grain yield and Nitrogen fixation of faba bean at Dedo *Means followed by the same letter within a column are not statistically significant to each other, ** Nitrogen derived from the atmosphere, ns= not significant Fig 2. Interaction Plot (fitted means) for P-use efficiency (g shoot mg P-1) Fig 1. Interaction Plot (fitted means) for Total P uptake (kg/ha) of six faba bean varieties * PPP= Pods per Plant; 1000SW= one thousand seeds weight; GY= Grain yield, Ndfa= Nitrogen derived from the atmosphere • Conclusions • Evaluate rotational effects of superior fafa bean varieties like Moti, Obse, and Degaga for the subsequent cereal crop (Activity 3) This is PhD work done in the context of the IUC-JU project Contacts: PhD: amsalu.nebiyu@ju.edu.et; supervisors: pascal.boeckx@ugent.be, jan.diels@ees.kuleuven.be

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