César Gozález O.1, Alberto Valdés F.2, Walterio Astudillo V.3 y Manuel Madrid A.4

The nutrient content of leaves and stalks of two alfalfa varieties Medicago sativa vars. Moapa (irrigated) and Ligüen (not irrigated) fields were studied. The soil was analyzed in order to study its influence on the crop.
The samples were taken at 20-25 days interval, starting from the time the field was left to seed up to a few days before harvest. The levels of N, P, K, Ca, Mg, Mn, Zn and Cu were determined.
Special emphasis was give to the seasonal variations of macro and micronutrients. From the foregoing, aproximate dates are proposed in order to obtain suitable tissue samples that will correlate with seed production.

1Dr. Ciencias Químicas. Profesor de Química Analítica. Sección Química Vegetal Dpto. de Química Inorganica y Analítica de la Facultad de Ciencias Químicas. Universidad de Chile. Casilla 233, Santiago, Chile.
2Ing. Agr., M. S., Profesor de Suelos. Facultad de Agronomía de la Universidad de Chile, Casilla 1004, Santiago, Chile.
3Licenciado en Química y Farmacia. Universidad de Chile.
4Licenciado en Química y Farmacia. Universidad de Chile.