00238nam a22000977a 4500003000400000008004100004082001500045100002800060245003100088260002100119OSt231203b        |||||||| |||| 00| 0 eng d  a630.5bA25  aAmerican Sact. of Agri.  aAgronomy JournalbVol.- 51  bCSRS, Pusac1959