%0 Journal Article
%T Weeds under the canopies of tree species submitted to different planting densities and intercropping Plantas daninhas sob copas de esp¨¦cies arb¨®reas submetidas a cons¨®rcios e densidades de plantio diferentes
%A A.D Souza
%A P.S.L Silva
%A O.F Oliveira
%A I.M Dantas
%J Planta Daninha
%D 2013
%I Sociedade Brasileira da Ci¨ºncia das Plantas Daninhas
%R 10.1590/s0100-83582013000100004
%X Assessing the growth and floristic composition of species that grow under the canopy of trees is important for weed control (WC). The objective of this study was to assess two experiments (E1 and E2), when the trees were two years and one year of age, respectively. In E1, sabi¨¢ (S) and gliricidia (G) were submitted to planting densities from 400 to 1.200 plants ha-1. In E2, growing systems consisting of S, G, and neem (N) combinations were compared: SSS, GGG, NNN, GSG, NSN, SGS, NGN, SNS, and GNG (each letter represents a row of plants). A random block design was adopted, with three (E1) and four (E2) replicates. In E1, treatments were arranged as split-plots (species in plots). In E2, the degrees of freedom for treatments (8) were partitioned into growing systems (treatments that involved the same species) and between growing system groups (2). Twenty-one weed species were found in E1. Gliricidia attained greater plant height than sabi¨¢, but these species did not differ in canopy diameter, number of weed species per plot, and weed green and dry biomass of the shoot. Higher planting densities resulted in the reduction of all those traits. Twenty-six weed species were found in E2. Growing systems that included gliricidia showed canopies with greater diameters than growing systems that included neem. There were no differences between growing systems for number of weed species per plot and for weed green and dry biomass of the shoot. Avalia  es do crescimento e da composi  o flor¨ªstica de esp¨¦cies que vegetam sob a copa das ¨¢rvores s o importantes no controle de plantas daninhas (PD). O objetivo deste trabalho foi realizar essas avalia  es em dois experimentos (E1 e E2), quando as ¨¢rvores tinham idades de dois anos e um ano, respectivamente. Em E1, sabi¨¢ (S) e gliric¨ªdia (G) foram submetidas a densidades de plantio de 400 a 1.200 plantas ha-1. Em E2, foram comparados sistemas de cultivo de S, G e nim (N): SSS, GGG, NNN, GSG, NSN, SGS, NGN, SNS e GNG (cada letra representa uma fileira de plantas). Utilizou-se o delineamento de blocos ao acaso com tr¨ºs (E1) e quatro repeti  es (E2). Os tratamentos foram dispostos em parcelas subdivididas em E1 (esp¨¦cies nas parcelas). No E2, os graus de liberdade de tratamentos (8) foram desdobrados em sistemas de cultivo (tratamentos que envolveram uma mesma esp¨¦cie) e entre grupos de sistemas de cultivo (2). No E1 ocorreram 21 esp¨¦cies de PD. A gliric¨ªdia apresentou maior altura da planta do que a sabi¨¢, por¨¦m as duas esp¨¦cies n o diferiram quanto a diametro da copa, n¨²mero de esp¨¦cies de PD por parcela e biomassas fresca
%K Mimosa caesalpiinifolia
%K Gliricidia sepium
%K Azadirachta indica
%K crescimento
%K composi  o flor¨ªstica
%K sub-bosque
%K Mimosa caesalpiinifolia
%K Gliricidia sepium
%K Azadirachta indica
%K growth
%K floristic composition
%K understory
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000100004