共 14 条
[2]
CROSS OE, 1971, ASAE71906 AM SOC AGR
[3]
HANNAPEL RJ, 1964, SOIL SCI, V9, P350
[9]
MURPHY LS, 1972, 1972 P CORN AGR WAST, P449
[10]
OLSEN SR, 1954, USDA939 CIRC

