From what has been said previously it is evident that organic matter in the soil is of the utmost agricultural importance. The colloidal properties of organic matter affect soil tilth and structure, regulate water relations and improve the base exchange capacity of soils. In addition, organic matter contributes nitrogen compounds and the many and varied mineral elements without which plants will not grow. In this chapter we shall deal in some detail with the ways in which organic matter can be returned to the soil.
Unable to display preview. Download preview PDF.