ABSTRACT.


J. DOMINGO GODOY H.1, FEDERICO KOCHER G.1 Y AURELIO VILLALOBOS P.3
 

Monthly fluctuations of nitrogen content in petioles and responses to different natural potasium salpetre treatments were determined.
The treatments were monthly applications of: 50 - 100 - 250 - 500 - 750 - 1000 gr. of natural potasium salpetre per plant.
Monthly measurements were taken for height, fruit production and nitrogen concentration in petioles of plants.

CONCLUSIONS
Nitrogen concentrations in petioles under field conditions present a September maximum and a relatively stable minimun among December and June. Plants receiving high natural potasium salpetre showed sorne nitrogen accumu ation in March.
Under field conditions nitrogen content in petioles increased with nitrogen applications. The best sampling date was found to be between May and June, months where the best correlations between applied nitrogen and petiole content was found.

Keywords:
1 Ingeniero Agrónomo, Proyecto Fruticultura, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias
2 Ingeniero Agrónomo Ph. D., profesor de la Cátedra de Fruticultura General, Facultad de Agronomía, Universidad de Chile. Coordinador Linea Fruticultura, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias, por convenio Universidad de Chile - Instituto.
3 Ingeniero Agrónomo, Proyecto Fruticultura, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias (actualmente en la Universidad de Rut