共 6 条
[2]
Iyengar GV, 1978, ELEMENTAL COMPOSITIO
[3]
IYENGAR GV, 1982, ANAL CHEM, V54, pA554
[4]
Sillanpaa M, 1982, FAO SOILS B, V48
[6]
1981, FED P, V40, P2111