共 11 条
- [1] Hall A. D., 1909, J BD AGR LONDON, V16, P365
- [5] HOLTERMAR G, 1907, LANWIRTSCHAFTL VERSU, V65, P1
- [6] LARSEN BR, 1897, ANDRA NORD LANDBRAKS, P72
- [7] MONTGOMERY EG, 1912, ANN REP NEB AGR EXP, V25, P164
- [8] MONTGOMERY EG, ANN REP NEB AGR STA, V25, P164
- [9] 1896, B U ILL AGR EXP STA, V41
- [10] 1911, J AGR SCI, V4, P107