共 17 条
- [2] [Anonymous], 1955, OFFICIAL METHODS ANA
- [4] BURTON GLENN W., 1956, AGRON JOUR, V48, P360
- [5] CANN DB, 1942, 742 SOIL SURV STANST
- [6] CANN DB, 1942, 45 SOIL SURV STANST
- [7] COLOVOS NF, 1961, 472 NH AGR EXPT STA
- [9] HOLMES J. C, 1963, ANIMAL PROD, V5, P17