Regression Analysis and Empirical Relationships for Predicting the Penetration Characteristics of Mechanized Tillage Implements in South-East Bioclimatic Region of Nigeria
Authors: Oduma O, Babalola SO, Onuoha SN, Onyeka FC
A regression analysis was conducted to obtain the empirical relationships for predicting the penetration characteristics of some mechanized tillage implements in south-east bioclimatic region of Nigeria. A Massey Ferguson tractor of model MF 430E was used for the study and the implements studied include the disc plough, harrow, ridger and the rotovator. Results obtained from the developed regression equations showed that plough had penetration resistance of 5.38 kN/cm3. While harrow, ridger and rotovator operations respectively recorded penetration resistances of 3.48, 1.97 and 1.53 kN/cm3. The prediction error for the tillage implements range from 2.68 to 11.39% with root mean square error varying from ±1.64 to ±3.37. The comparison of the predicted results with the experimental results revealed that the regression equations did not under-predict the experimental results, though slightly higher, but the prediction errors were within tolerable limit. Furthermore, from the root mean square error analysis, the errors were within acceptable limit of ±5%. The coefficient of determination R2 for the regression equations developed for predicting the various penetration characteristics of the implements range from 0.7979 to 0.946 which indicates high degree of correlation between the dependent and independent variables and that the equations were adequate for the prediction of the penetration characteristics of the implements.
Affiliations: Department of Agricultural and Bioresources Engineering, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria.
Keywords: Regression, Empirical Relationships, Tillage, Implements, Penetration Resistance
Published date: 2020/12/30