Show s r WHAT LIMITS CORN N YIELD tow Low Protein Corn Com More Apt pt to Do Wellon Well Weil Wellon on Land Poor in Nitrogen Than High Protein Corn Com Regarding the yield of corn com it seems quite possible that upon land whose whose productive capacity Is limited by the supply of or available nitrogen the low prot protein in or high starch corn may yield better than the high protein corn pru presided the two kinds of corn com are are equal In other respects as in germ power vigor of growth root I etc My opinion Is that if we wis have use for high protein co cowe cornwe corn cort we produce It and by means of 1 leguminous crops we should pro provIde provide provide vide t the e growing corn crop with as mn much l nitrogen as it can profitably us use Of course this principle applies not oi oily Ol ly to nitrogen but to all of the elements of fez uty There if is nc in allowing any crop to grow in i. i h lf starved inn any more mor than thaD than there is In keeping leeping g c u- u ani orals mala cn en a mere maintenance ration We should provide not only the ni nitro nitrogen tro trogen en but we should also make sure that the supply of phosphorus and potassium is sufficient for maximum profitable crop yields In this connection It may be stated that the evidence thus far obtained from soil solI Investigations in the corn corD belt indicates that the supply of ni nitrogen nitrogen nitrogen trogen is abundant In most soils solIs indeed in deed that large amounts of nitrogen are annually passing off in drainage waters that phosphorus and not nitrogen nItro ni tro trogen en is the element which commonly limits the yield of the corn crop an and that the chief effect of clover upon a 3 succeeding crop of corn com Is due to the phosphorus liberated by the decaying clover cloer residues the fixation of f ni nitrogen nitrogen trog trogen n being of or secondary import ance Cyril Cyrll Cyril G. G Hopkins University of Illinois |