Modern Corn Production

acid alfalfa ammonia ammonium ammonium phosphate amount Anhydrous ammonia applied areas broadcast bushels cause chemical clay coleoptile Corn Belt corn plant cost cultivation damage deficiency symptoms denitrification develop disease drouth early effect evaporation extra farm farmers favorable feed fertilizer burn field figure frost germination grain growing season growth harvest herbicides hybrids Illinois inches increase insects irrigation kernels kill leaf blight legume less livestock loams loss lower leaves maize manure maturity micronutrients minimum tillage nitrate content nitrogen fertilizer normal nutrients organic matter percent moisture phosphate phosphorus plant population planter plow layer pollen potassium pounds protein rain rainfall reduce residues root system rootworm row fertilizer samples sandy soils seedbed seedling shortage sidedressing silage silking silo soil surface soil tests soluble spray stalk rot storage subsoil supply tassel temperature tillage tion tissue test urea usually weather wet soil Wireworms zinc