共 8 条
- [1] BROWN EO, 1942, IOWA AGR EXP STA RES, V294
- [2] Chepil W. S., 1946, SCI AGRIC [OTTAWA], V26, P307
- [3] Chepil W. S., 1946, SCI AGRIC [OTTAWA], V26, P347
- [4] CROCKER WILLIAM, 1938, BOT REV, V4, P235, DOI 10.1007/BF02871649
- [6] GOSS WL, 1924, J AGR RES, V29, P349
- [7] HANSON NS, 1944, WASH AGR EXP STA POP, V176
- [8] TIMMONS FL, 1941, KANS AGR EXP STA B, V296