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Crop and Pasture Science Crop and Pasture Science Society
Plant sciences, sustainable farming systems and food quality
RESEARCH ARTICLE

Sward structure and relationship between canopy height and light interception for tropical C4 grasses growing under trees

Tiago Celso Baldissera A B F , Laíse da Silveira Pontes C , André Faé Giostri B , Raquel Santiago Barro D , Sebastião Brasil Campos Lustosa E , Aníbal de Moraes A and Paulo César de Faccio Carvalho D
+ Author Affiliations
- Author Affiliations

A Epagri—Company of Agricultural Research and Rural Extension of Santa Catarina, Estação Experimental de Lages, Rua João José Godinho s/n, Bairro Morro do Posto, CEP 88502-970, Lages, SC, Brazil.

B UFPR—Federal University of Paraná, Rua dos Funcionários 1540, Juvevê, CEP 80035-050, Curitiba, PR, Brazil.

C Estação Fazenda Modelo, IAPAR—Agronomic Institute of Paraná, Avenida Euzébio de Queirós s/n, Caixa Postal 129, Ponta Grossa, PR, Brazil.

D Faculty of Agronomy, UFRGS—Federal University of Rio Grande do Sul, Avenida Bento Gonçalves 7712, CEP 91501-970, Caixa Postal 776, Porto Alegre, RS, Brazil.

E UNICENTRO—State University of Midwest, Rua Simeão Varela de Sá 03, Vila Carli, CEP 85040-080, Guarapuava, PR, Brazil.

F Corresponding author. Email: tiagobaldissera@epagri.sc.gov.br

Crop and Pasture Science 67(11) 1199-1207 https://doi.org/10.1071/CP16067
Submitted: 26 February 2016  Accepted: 6 September 2016   Published: 13 October 2016

Abstract

The canopy height (CH) at 95% light interception (LI) is a valuable defoliation frequency strategy used to handle variability in herbage accumulation throughout the year, mainly in C4 grasses. Such a strategy has been adopted as an open pasture management index, but defoliation frequency and intensity remain unsolved issues for shade-grown forages. A field experiment was conducted for 2 years to determine the influence of tree canopy (Eucalyptus dunnii) shading and nitrogen availability (0 and 300 kg N ha–1 year–1) on CH at 95% LI of six perennial tropical forage species. The plots were cut at 95% LI, and the height of the residual sward was kept at 50% of the corresponding CH at 95% LI. The shade level ranged from ~40% at the beginning of the experiment to ~60% at the end of summer 2013. Variations in CH at 95% LI occurred because of shading and across seasons. The range of these variations was species-dependent. Overall, species growing under trees showed higher CH, except for Paspalum notatum and Megathyrsus maximus in the first year. There was a significant increase in the length of the sheaths and leaves, as well as a decrease in tiller density and leaf : stem ratio in plants growing under trees. Nitrogen also had an impact on CH; however, its application did not compensate the shade effect on CH. Therefore, our results suggest that greater CH should be considered in case of defoliated, shade-grown plants and that such strategy might change throughout seasons.

Additional keywords: environmental preservation, forage species, integrated crop–livestock systems, plant competition, shade avoidance syndrome.


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