共 24 条
- [3] Blake GR, 1965, AGRONOMY, P374, DOI DOI 10.2134/AGRONMONOGR9.1.C29
- [5] BOELLSTORFF JA, 1978, IOWA GEOLOGICAL SURV, V8, P31
- [7] GANTZER CJ, 1978, AGRON J, V70, P853, DOI 10.2134/agronj1978.00021962007000050035x
- [8] Gardner WH., 1965, AGRONOMY, V9, P82
- [10] Hansbo S, 1957, ROYAL SWEDISH GEOTEC