“…ORGANIC matter is frequently added to topsoils to maintain and improve structure (Emerson, 1959;Harris et al, 1966;Greenland, 1965a,b); to increase the water holding capacity of sandy soils (Pearson, 1966); to change the porosity and permeability of heavy clay soils (Parr and Bertrand, 1960), and to enhance cation exchange properties (Allison, 1973;Broadbent, 1955;Helling et al, 1964). Organic matter is added naturally as leaves, stems, roots, etc., and artificially by green manuring, application of farmyard manure, seaweed, etc.…”