ABSTRACT

Several studies have reported the effect of weed competition on eucalypt plantations, but most have focused on initial growth. The aim of the study reported here was to evaluate the long-term growth response of Eucalyptus urograndis in weed-control strips of different widths and its competitive performance in a rotation area over seven years. An experiment was conducted in a commercial area (12 960 m²) in Eunápolis, Bahia, Brazil. The treatments consisted of weed-control strips with the following widths on both sides of eucalypt planting lines maintained for the first six months of crop cultivation: 0 cm (weedy check control); 25 cm; 50 cm; 75 cm; 100 cm; 125 cm; 150 cm; 175 cm; and 200 cm (weed-free control). The 125-cm weed-control strip obtained the best eucalypt growth performance after seven years, with a gain of 61.8% compared with the weedy check control. The competitiveness index of E. urograndis tended to increase after the first two years of cultivation, the period in which the interference caused by weeds was most accentuated.

摘要

一些研究报告了杂草竞争对桉树种植园的影响，但大多数研究都集中在初始生长上。本文报道的研究目的是评估尾巨桉在不同宽度的杂草控制带中的长期生长反应及其在轮作区七年的竞争表现。实验在商业区（12 960 m ²）位于巴西巴伊亚州尤纳波利斯。处理方法包括在作物种植的前六个月保持桉树种植线两侧具有以下宽度的杂草控制带： 0 厘米（杂草检查控制）；25 厘米；50 厘米；75 厘米；100 厘米；125 厘米；150 厘米；175 厘米；和200厘米（无杂草控制）。125厘米杂草控制带在七年后获得了最好的桉树生长性能，与杂草检查对照相比增产了61.8%。栽培前两年，杂草干扰最为严重，其竞争力指数呈上升趋势。