共 10 条
[3]
EFFECT OF PLOWING AND DIRECT DRILLING ON SOIL NITRATE CONTENT
[J].
JOURNAL OF SOIL SCIENCE,
1975, 26 (01)
:53-61
[4]
DOWDELL RJ, 1981, PHIL T R SOC LOND
[9]
Winogradsky S, 1924, CR HEBD ACAD SCI, V178, P1236
[10]
1979, FERTILIZER RECOMMEND