• Composition of soil as affected by different cropping systems 

    Lowry, Marion Wayne (University of Missouri, 1913)
    Among the experiments in soil fertility which are being carried out by the University of Missouri College of Agriculture is a series of plot experiments which have been in progress since 1889. There are thirty-nine plots ...
  • Control of the humus supply of certain important Missouri soils 

    Doneghue, R. C. (Ray Claude) (University of Missouri, 1908)
    The soils of Missouri, with very few exceptions, are deficient in humus, and the continuous cropping (to corn especially) which is practiced in many parts of the state is rapidly depleting what humus there is in the soil. ...