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This study received no specific financial support.
The authors declare that they have no competing interests.
Authors thank very much Mr. Solomon Abdeta, an agro-engineer and economist from Adama, for his valuable assistance and economic advices. Without him, this work could not be achieved. Also, Authors thank Mr. Jibicho Geleto, an engineer from Adama agricultural office for his precious help all the time of our visit in Adama (Boset) at the inquiry process to collect the required data.