A manual colorimetric procedure for measuring ammonium nitrogen in soil and plant Kjeldahl digests
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Tài liệu tham khảo
Bremner J.M., 1982, Methods of soil analysis, Part 2, 2, 595
Baethgen W.E., 1988, Soil Sci. Soc. Amer. J.
Wall L.L., 1975, J. Assoc. Off. Anal. Chem., 58, 811