Effects of weed control area in rows on initial development of ponkan mandarin (Citrus reticulata Blanco) trees. / Efeitos da área de controle das plantas daninhas (coroamento ou faixa) no desenvolvimento inicial de tangerina Poncã (Citrus reticulata Blanco).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The objective of this research was to evaluate the weed interference on the initial development of "Ponkan" Mandarin trees grafted on "Cravo" [Citrus limonia (L.) Osbeck], through areas of weed control in rows (crown or strips) near to the young plants in the field. For that it was conducted an experiment in the experimental area of the Departamento de Produção Vegetal, Escola Superior de Agricultura "Luiz de Queiroz", in Piracicaba county, São Paulo state, Brazil.The young plants of mandarin were transplanted in 03/10/1999, in a 6,0 m by 4,0 m spacing. The inter rows were mowed using conventional mower powered by a tractor.The experimental treatments were set in a randomized block design with subplots, four replications. The data obtained were submitted to F test and analysis of variance, and the averages were compared using Tukey test at 1% and 5% level of probability. Each experimental plot had four plots. The sub-plots were constituted of two plants. The weeds surrounding the plants were manually hoed from the row center to the inter row direction, at 25 cm, 50 cm, 75 cm and 100 cm distance from the tree trunk, besides a plot weeded, and a plot entirely hoed. In the sub plots the weeds were hoed in a circle forming a crown unweeded around the tree trunk according to the treatments. The mandarin plant development was evaluated every three months from 05/04/99 to 07/19/01, being measured the trunk diameter, shot diameter and height. The obtained data allowed the following conclusions:In the first year after the orchard establishment, it was necessary weed control in the citrus row extending to a 75 cm of the crown, or 25 cm strips wide each side of the tree trunk. During the second year of mandarin orchard establishment manual weed control using hoe is necessary in a 100 cm crown diameter surrounding the tree trunk, or in the strips of 25 cm each side of the tree trunk. The treatments with manual hoe the strips allowed a better plants development. During the third year of mandarin orchard establishment manual weed control using hoe is necessary in the 100 cm diameter of the crown surrounding the tree trunk or in strips of 25 cm each side of the tree trunk.

ASSUNTO(S)

competition vegetal development plantas daninhas – competição damages práticas culturais (fitotecnia) harmful plants practical cultural desenvolvimento vegetal – danos

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