Desempenho silvicultural de clones de eucalipto e características agronômicas de milho cultivados em sistema silviagrícola

Abstract

An experiment based on Agroforestry System was conducted in Paracatu, MG. It consisted of four eucalyptus clones (two E. camaldulensis clones, codes 137 and 180, and two E. urophylla clones, codes 13 and 44) planted at 10m x 4m spacing intercropped with corn (cultivar BR 205) between rows. The experiment was arranged in a randomized block design with four treatments (4 eucalyptus clones) distributed in six blocks. The randomized block (6 blocks) design with split-plots (4 x 2, plus 1 monoculture, in a total of 9 treatments) was used for the corn culture. Plots consisted of systems of corn intercropped with four eucalypts clones and single-crop corn cultivation. The split-plots consisted of two corn rows set apart from the eucalyptus rows: the first and second corn rows adjacent to the eucalyptus rows (1.8 and 2.7 m) and the fourth and fifth corn rows in the center of the eucaliptus rows (4.5 and 5.4 m). E. camaldulensis clones had survival, height, volume/tree and volume/ha higher than E. urophylla clones. Higher means of diameter at breast height, volume/tree, volume/ha and tree stem form were found for E. camaldulensis 137 clones, as well as lower corn yield. Corn production in intercropped systems with eucalyptus clones was lower than in monoculture. The highest corn yield in the Agroforestry System with eucalyptus was obtained in the central planting rows.