共 10 条
- [1] The determination of nitrogen in heavy clay soils [J]. JOURNAL OF AGRICULTURAL SCIENCE, 1925, 15 : 454 - 459
- [2] Bremner J.M., 1965, METHODS SOIL ANAL PA, P1149
- [3] Cope WC., 1916, J IND ENG CHEM, V8, P592
- [4] GEHRKE CW, 1972, J ASSOC OFF ANA CHEM, V55, P467
- [9] OLSEN C, 1929, COMPT REND TRAV LAB, V17
- [10] PRUDEN G, 1984, FERT RES