Yearbook of Agriculture

16 Sept 30 Sept agriculture air masses amount annual anticyclonic areas atmosphere average dates belt Chernozems climate coast cold corn cotton crops Days Days Days diseases drought eastern effect erosion evaporation extreme factors fall Growing season favorable flood forecasts forest freezing frost in spring fruits grasses grown growth heat humid illus inches irrigation isentropic surface July June Lake land Last in spring last killing frost latitudes legumes Length of record less Meteorologist millibars moist moisture mountain normal northern northern Great Plains occur percent period Plains plants Podzolic polar polar front prairie precipitation production radiosonde rain rainfall range regions run-off season Last seed snow soil sorghums southern stations storms sugar beet sugarcane summer surface tion tropical types United Valley varieties vegetation warm warm front Weather Bureau western wheat wind winter