Changes in the soil organic N fractions of a tropical Alfisol fertilized with 15N-urea and cropped to maize or pasture von González-Prieto, S.J, Jocteur-Monrozier, L, Hétier, J.M, Carballas, T

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Nitrogen uptake and chlorophyll meter measurements in Spring Wheat von Vidal, I. (Concepcion Univ., Chillan (Chile). Facultad de Agronomia, Dept. de Suelos), Longeri, L, Hetier, J.M

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The fate of nitrogen under maize and pasture cultivated on an alfisol in the western Llanos savannas, Venezuela von HÉTIER, J.M., SARMIENTO, G., ALDANA, T., ZUVIA, M., ACEVEDO, D., THIÉRY, J.M.

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Potassium assimilable du sol: identification au compartiment des ions isotopiquement diluables von Fardeau, J.C, Hetier, J.M, Jappe, J

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Available soil potassium: identification with the pool of isotopically diluable ions von Fardeau, J.C, Hetier, J.M, Jappe, J. (CEA Centre d'Etudes Nucleaires de Cadarache, 13 - Saint-Paul-les-Durance (France). Dept. de Biologie, Service de Radioagronomie)

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