Nutrient inputs through rainfall in Eucalyptus grandis stands

Abstract

Incident precipitation, throughfall and stemflow under a Eucalyptus grandis stand were collected and their chemical composition was analysed to quantify nutrient accretion to the soil by precipitation during a 12 month period from November 1992 through October 1993. The stand was stablished in the State of São Paulo, Brazil, in 1991 after applications of pulp residues and ash. Throughfall and stemflow were generally richer in K, Ca, Mg and SO4 but very poor in P and N probably due to the direct absorption of the latter by the canopy. The same was observed with K but only in the plot that received no pulp residue or ash. This paper summarizes the results of the present nutrient input study, correlating it with the nutrient requirement of E. grandis.