TY - BOOK ED - Symposium on Soil Organic Matter Studies TI - Soil organic matter studies: proceedings of a symposium on soil organic matter studies SN - 92-0-010177-1 U1 - 631.417 SYM 1977 PY - 1977/// CY - Vienna PB - IAEA KW - Humus KW - Congresses KW - Soil productivity KW - Soils KW - Nitrogen content N1 - Kaynakça var ER -