About one-third of the machines hac been used one /ear, one-third two years and one-third had been used for three years or more. The oldest ... Sixteen farms used 17 choppers on grass silage an average of El; hours. On twelve farms dried anbsp;...
|Title||:||The use and cost of operating field choppers, Oneida county, New York, 1949|
|Author||:||Douglas James Packman|