共 8 条
- [1] BURTON, 1916, PHYS PROPERTIES COLL
- [2] COMBER, 1920, J AGR SCI, V10, P425
- [3] COMBER, 1921, J AGR SCI, V11
- [4] HALL, 1907, J AGR SCI, V2, P244
- [5] KEEN, 1920, J AGR SCI, V10, P44
- [6] ODEN S, 1919, J LANDWIRT, P177
- [7] 1914, SILICE SILICATES
- [8] 1919, BOOK ROTHAMSTED EXPT, P295