Viljankorjuun työnmenekin kehityksestä

Authors

• Erkki H. Oksanen Maatalouden työtekniikan laitos, Helsingin Yliopisto

DOI: https://doi.org/10.23986/afsci.71803

Abstract

The study is based on material collected from eight book-keeping farms in South Finland during years 1948—64. As variables there have been man-, horse-, tractor-, and combine working hours per hectare on grain, yield per hectare, area on grain, the share of fields on winter rye and turnip rape (%), and the converted agricultural land area. Analysis of variance and t-tests have been used to find out the differences for variables between the farms, and between the study years. There have been significant differences in relation to all variables between the farms, and between the years in relation to work consumption figures. In variables man-, horse-, and self propelled combine hours, the variation between the years has been more than double when compared to that between the farms. In other variables the variation between the farms has been greater. In stepwise multiple regression analysis, man work consumption has been explained best by horse working hours. When it has been the only predictor R2 has reached 0.7— 0.9 in different equations. Also tractor work consumption has been explained best by horse working hours, but other variables have come out often, too. Horse work consumption has been explained best by man working hours. The percentage variation explained in regression equations has in general been quite high, likewise the F-values of equations. Due to correlation between the variables, it has only seldom been possible to study separate regression coefficients.