Subject(s): Agricultural wastes -- Soil Fertility -- Agricultural systems of Occident, Orient, peasant holdings, plantations, undeveloped areas -- Organic matter and soil fertility : Soil humus, formation of Humus as a result of synthesizing activities of micro organisms, role of humus in soil, washing symposium on soil organic matter -- Sources of organic matter : Root system of crops, soil algae, green manure, farmyard manure, artificial farmyard manure -- manufacturing of compost by Indore method : Compost factory, collection and storage of raw material, plant residues, urine earth and wood ashes, water and air, arrangement and disposal of bedding under the work cattle, charging compost pits, manurial value of Indore compost -- Chief factors in Indore process : Continuous supply of mixed vegetable wastes, composting single materials, nitrogen requirments, amount of water needed, supply of air, maintenance of general reaction, fermentation of nitrogen -- Application of other areas