Show best advantage preparation land deep constant until spring sol sol soil sol soil fertile half INCREASE YIELD PER ACRE quantity water produce grain important recent discoveries grain thai soil moisture brought proof quantity water produce bushel grain smaller soil twice water produce bushel grain infertile soil fertile soil kansas result europe america every case fertile soil either manure commercial less amount water necessary bushel grain greater plant food soil inert until deep thorough preparation moisture soil air gases inert earth moisture plant food bacteria soil bacteria plant food earth wheat fields minimum amount land toward 2000 2000 water fields pound wheat plan shallow increase enough moisture produce bushel grain slight preparation intensive double service rainfall commercial manure soil soil sell soil sell same effect increase grain effect rainfall way double treble yield pr pr per acre 5 moisture |