For the purpose of preventing soil erosion and its accompanying evils in Attala, Carroll, Claiborne, Clay, Copiah, Forrest, Franklin, George, Greene, Grenada, Hancock, Harrison, Holmes, Humphreys, Itawamba, Jackson, Kemper, Lamar, Leake, Lee, Madison, Monroe, Neshoba, Oktibbeha, Pearl River, Pike, Prentiss, Rankin, Scott, Stone, Tishomingo, Union, Warren and Webster Counties, Mississippi, so far as possible, said counties are hereby authorized to declare it to be the policy of the county to encourage and assist owners of land therein to properly terrace and ditch their agricultural lands, and cooperate with the federal government in soil erosion work.