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Purificación Sáez-Plaza, Tadeusz Michałowski, María
José Navas, Agustín
García Asuero & Sławomir Wybraniec. (2013) An Overview of the Kjeldahl Method of Nitrogen Determination. Part I. Early History, Chemistry of the Procedure, and Titrimetric Finish. Critical Reviews in Analytical Chemistry 43:4, pages 178-223.
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PaulV. Nelson, CarlE. Niedziela$suffix/text()$suffix/text(), DharmalingamS. Pitchay & NancyC. Mingis. (2010) EFFECTIVENESS, AMMONIUM IMPACT AND POTASSIUM ADEQUACY OF SOYBEAN-BASE LIQUID FERTILIZER ON BEDDING PLANTS. Journal of Plant Nutrition 33:5, pages 724-735.
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PaulV. Nelson, DharmalingamS. Pitchay, CarlE. Niedziela & NancyC. Mingis. (2010) EFFICACY OF SOYBEAN-BASE LIQUID FERTILIZER FOR GREENHOUSE CROPS. Journal of Plant Nutrition 33:3, pages 351-361.
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P. P. David, P. V. Nelson & D. C. Sanders. (1994) A humic acid improves growth of tomato seedling in solution culture. Journal of Plant Nutrition 17:1, pages 173-184.
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