A manual colorimetric procedure for measuring ammonium nitrogen in soil and plant Kjeldahl digests

Communications in Soil Science and Plant Analysis - Tập 20 Số 9-10 - Trang 961-969 - 1989
Walter Baethgen1, Marcus M. Alley2
1International Fertilizer Development Center , P.O. Box 2040, Muscle Shoals , AL , 35661
2Agronomy Department , Virginia Polytechnic Institute and State University , Blacksburg , VA , 24061

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