共 9 条
- [2] GRABER LF, 1927, WISCONSIN AGR EXP ST, V80
- [4] JONES LH, 1921, J AGR RES, V21, P701
- [5] KRAUS EJ, 1918, OREGON AGR EXP STA B, V149
- [6] LEUKEL WA, 1930, FLORIDA AGR EXP STA, V219
- [7] PIERRE WH, 1929, J AM SOC AGRON, V21, P1079
- [8] ROBBINS WR, 1927, NEW JERSEY EXP STA A, P178
- [9] WALTER T, 1932, PLANT PHYSIOL, V7, P391