Show soil building the difference between soil build ing and soil mining is shown in the chart below soil building means increasing the soils organic matter an ana plant food supply and maintaining high crop yields it means fee feeding d the soil and letting the soil feed the crops rather than trying to feed each individual crop the comparative results shown here heie were obtained at the ewing soil experiment held field in illinois one alc plc plot has had no soil treatment s since ince the field was established in 1910 the other plot has had large amounts of SOIL WITH MANURE PHOSPHATE lima r 76 ILI I 1 NOT I 1 at chowne a coan as 1 4 44 28 L a CORN CA 6 N chor 16 NS OP alg mai na MATTER R ll alti of TI ACRE fw lime phosphate and potash to get heavy stands of deep rooted legumes corn stalks have been returned to this plot the hie rotation on both plots his has been corn oats clover and wheat crop yields covering a tour four year To rotation tation tell the story corn production on the fertilized plot was four times greater than on the untreated field oats nearly four times and wheat about eight times greater clover yield on the fertilized plot was 19 tons toni per acre the untreated plot is too acid to grow legumes despite the greater gi eater amounts of nitrogen and organic matter used in producing the higher yields the fertilized plot still contains 4 tons more organic matter and pounds more nitrogen nitro 19 en than the untreated field |