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Abebe Zerihun

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Abebe Zerihun
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Abebe Zerihun
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0000-0002-3970-844X

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    Maize yield response to crop rotation, farmyard manure and inorganic fertilizer application in Western Ethiopia
    (Academic Journals, 2013) Abebe Zerihun; Tolera, A.; Tusa, D.; Kanampiu, F.
    Continuous cropping with inorganic inputs has limitations in terms of maintaining long-term soil fertility. However, crop rotation integrated with fertilizer application is one of the cheapest alternative methods for sustainable crop production. In recognition of this fact, the experiment was conducted at Bako in western Ethiopia with the objective of identifying the best precursor crops and optimum integration of farm yard manure and inorganic fertilizer in a maize based rotation sequence. Two separate trials with different precursor crops were combined with three rates of organic manure and three rates of inorganic fertilizer NP2O5. The experimental design was 3×3×3 factorial arrangement in randomized complete block design in three replications. Inclusion of precursor crops markedly increased maize yield as compared to mono crops. The highest grain yield was obtained when haricot beans and Niger seed were the precursor crops. Application of 12 t ha-1 FYM after precursor crops resulted in grain yield of 9.3 t ha-1 and a marginal rate of return 225%. However, continuous incorporation of manure after precursor crops did not significantly (P>0.05) increase the yield. Application of 89/-35 kg ha-1 NP2O5 after legume maize rotation gave a grain yield and the highest marginal rate of return (236%). Haricot bean, Niger seed followed by application of either 12 t ha-1FYM or 89-35NP2O5 kg ha-1 is a better option for sustainable maize production than continuous mono cropping. As conclusion, haricot bean, Niger seed and Soybean can be used as precursor crops with use of either 12 t ha-1 of FYM or 89/35 kg ha-1NP2O5.
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    The effect of integrated organic and inorganic fertilizer rates on performances of soybean and maize component crops of a soybean/maize mixture at Bako, Western Ethiopia
    (Academic Journals, 2013) Abebe Zerihun; J. J. Sharma; Nigussie Dechassa; Kanampiu, F.
    The experiment was conducted to determine the best compatible soybean varieties in intercropping systems and the most economically optimum integrated fertilizer rate. The factorial experiment consisted of two soybean varieties (Didessa and Boshe) treated with eight levels of combined organic and inorganic fertilizer applications in three replications. Both sole soybeans and maize under recommended fertilizer recommendation were also included for comparison purposes. The result indicated that there were significant differences in leaf area index, plant height and grain yield of maize due to integrated fertilizer application, but not in harvest index. However, statistically significant variations were observed on nodule number per plant, leaf area per plant and yield of intercropped soybeans as a result of soybean varieties and the interaction of varieties with fertilizer application. Higher nodules and leaf areas per plant were recorded in Didesa variety than Boshe. This could be due to varietal difference, itegrated fertilizer application and cropping systems as well. Yield advantage obtained due to various combinations of fertilizer rates ranged from 6 to 28% over the yield of sole maize. Monetary advantage (MA) obtained due to intercropping systems ranged from the lowest Birr 1927 ha-1 to Birr 8446 ha-1 under various proportions of fertilizer applications. Application of both recommended NP and farmyard manure (FYM) resulted in the highest (Birr 8446 ha-1) MA followed by recommended NP (Birr 4583 ha-1). However, an integrated use of 12 t ha-1 FYM with 28/12N/P2O5 saved up to 75% cost of commercial fertilizer for both years and cost for application in the next year.
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