Show poor soil needs proper Treat treatment mei it land that est yields found to respond to building up supplied s by the college ee of agriculture agriculture Acri culture slun iel university ers ity ot of illinois no t s service ervice those soils which produce the yields without treatment make the best response to soil build ing practices according to a bulletin crop yields fram tro m illinois S soil 01 1 I experiment fields published by the college of agriculture uni university erv of illinois with the less productive soils the increased yield from treatment was several times as great as the yield obtained without treatment the bulletin states however on the more prod productive octive soils yields from the plots without treatment were several times as great as any increase that could be attributed to soil treatment despite this fact on each field there was found at least one practice that raised the efficiency of production enough to pa pay for the treatment whether the crop producing capacity of the loss less productive soils can be raised to the present productive levels of the better soils seems doubtful the gray and yel low soils alter after 25 years have potential levels only about one hau half the level ot of the better untreated soils since 1876 when the morrow plots oldest soil experiment field in america ica w were ere established the college of agriculture has been studying the soils of the state to learn practices which would bring about more efficient production lower the cost of production improve the quality of crops grown on the soil and maintain soil fertility with the morrow plots located on the grounds of the agricultural college at urbana a number of outlying fields have since been established throughout the state to study soil types in each section during the past years crop season 26 permanent Inan Clit fields were vere in operation |