Growth of the crabgrass species Digitaria ciliaris and Digitaria nuda


Autoria(s): Souza, R.C.; Dias, A.C.; Figueiredo, Ademir Goulart; Obara, Flávio Eduardo Botelhos; Christoffoleti, Pedro Jacob
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

04/11/2013

04/11/2013

2012

Resumo

The aim of this research paper was to compare the growth of D. ciliaris and D. nuda crabgrass species under non-competitive conditions. To this end, two experiments were conducted, one from March - July 2010 and the other from February - June 2011. The experimental design of both trials was completely randomized making a factorial (2 seasons x 2 species crabgrass x 12 evaluation periods) with four replications. Assessments began at 15 days after sowing (DAS), and repeated weekly until 92 DAS. The variables evaluated were total dry matter (roots+leaves+stems), leaf area, leaf number and tiller. The results were submitted to analysis of variance and the absolute growth rate, relative growth rate and leaf area ratio were calculated using the means, which were adjusted regression models. The crabgrass species were significantly different in leaf area, leaf number, tiller number and dry matter per plant. D. ciliaris for all variables was statistically higher than D. nuda. Regarding the speed at which the growth of the species occurred, the absolute growth rate and relative growth rate of D. ciliaris was also greater than D. nuda. In addition, D. ciliaris also had a lower leaf area ratio indicating greater efficiency in converting light energy into carbohydrates. It can be concluded that D. ciliaris has a higher growth rate in conditions where there is no limitation of nutrients and water availability in relation to D. nuda, mainly due to D. ciliaris have greater leaf area, number of leaves and dry matter accumulation per plant.

Identificador

Planta daninha, v.30, n.2, p.317-325, 2012

0100-8358

http://www.producao.usp.br/handle/BDPI/38745

10.1590/S0100-83582012000200010

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000200010&lng=en&nrm=iso&tlng=en

http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0100-83582012000200010&lng=en&nrm=iso&tlng=en

http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0100-83582012000200010&lng=en&nrm=iso&tlng=en

Idioma(s)

eng

Publicador

Sociedade Brasileira da Ciência das Plantas Daninhas

Relação

Planta Daninha

Direitos

openAccess

Palavras-Chave #growth curve #competitive ability and weed biology #curva de crescimento #habilidade competitiva e biologia de plantas daninhas
Tipo

article

original article