Show soil needs nitrogen how lime clover and crop residues increase the soils nitrogen and organic matter supply and thus boost crop yields is shown by the tha chart below this drawing summarizes results of tests at the dixon soil experiment field by university of illinois agronomists all ali three plots in the tests were limed and the crop rotation on each included corn oats and wheat one plot had no clover the small grain straw was removed and the cornstalks corn stalks were burned this plot produced a tour four year average ot of 57 bushels per acre the second plot had the same UMENO UME NO CLOVER BURNED CORN sabu 57 BU MME LIME SWEET BURNER CORM COPH 81 BU am LIME SWEET HOVER COON STALKS AND aap WHEAT STRAW PLOWED UNDER CORN 88 W IBM M treatment except that sweet clover was seeded in the wheat and plowed under as a green manure crop lor for corn the increased nitrogen and organic matter from the clover boosted the corn yield 24 bush bushels bushel elss syOn on the third plot sweet clover was grown and in addition the corn stalks oats straw and wheat straw were returned to the soil the extra organic matter nitrogen and other plant foods thus saved and returned in the crop residues resi duea gave the soil what it takes to yield 83 88 bushels of corn per acre |