April 2019

Design, fabrication and evaluation of bio-digester for generating bio-gas and bio-fertiliser for Auchi polytechnic demonstration farm

A 4000 L bio-digester was designed and fabricated using 5 mm mild steel plate with the main purpose of generating biogas and bio-fertiliser for Auchi Polytechnic Demonstration Farm. To achieve this, a varying ratio of 1.155 m3: 2.310 m3 mixtures of cow dung and water were anaerobically digested in the batch digester. The experiment lasted for 33 days during which the quantity of gas generated were evaluated. The volume...

Author(s): Onuoha S. N., Unuigbe O. M., Suleiman I. A., Chukuwendu U. M. and Ogie-Aitsabokhai L.Y.  

April 2019

Efficiency of empirical methods for reference evapotranspiration estimation in the district of Vilankulo, Mozambique

Precise quantification of reference evapotranspiration (ETo) is crucial for calculating crop water demand. Eight empirical methods based on temperature and six on solar radiation were evaluated against Penman-Monteith FAO 56 method based on: Mean Bias Error (MBE), Root Mean Square Error (RMSE), Willmott coefficient (“d”), determination coefficient (R2) and the Student’s t-test. The meteorological data...

Author(s): Bartolomeu Félix Tangune and Catine António Chimene