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CHANGES IN TILLERING DYNAMICS OF INTERCROPPED BLACK OAT AND ANNUAL RYEGRASS ENSURE A STABLE SWARD

Published online by Cambridge University Press:  18 October 2017

PAULO GONÇALVES DUCHINI ,
GABRIELA CRISTINA GUZATTI ,
HENRIQUE MENDONÇA NUNES RIBEIRO-FILHO  and
ANDRÉ FISCHER SBRISSIA
PAULO GONÇALVES DUCHINI
Affiliation:
Animal Production and Food Science Department of SantaCatarina State University (UDESC/CAV), Avenida Camões, 2090, 88520-000, Lages, SC, Brazil
GABRIELA CRISTINA GUZATTI
Affiliation:
Animal Production and Food Science Department of SantaCatarina State University (UDESC/CAV), Avenida Camões, 2090, 88520-000, Lages, SC, Brazil
HENRIQUE MENDONÇA NUNES RIBEIRO-FILHO
Affiliation:
Animal Production and Food Science Department of SantaCatarina State University (UDESC/CAV), Avenida Camões, 2090, 88520-000, Lages, SC, Brazil
ANDRÉ FISCHER SBRISSIA*
Affiliation:
Animal Production and Food Science Department of SantaCatarina State University (UDESC/CAV), Avenida Camões, 2090, 88520-000, Lages, SC, Brazil
*
†Corresponding author. Email: sbrissia@cav.udesc.br
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Summary

Mixing species with different tillering peaks may enhance pasture stability, but intercropping may also alter the plants’ tillering patterns. This study aimed to evaluate tillering dynamics in black oat (Avena strigosa Schreb.) and annual ryegrass (Lolium multiflorum Lam.) pastures grown as monocultures or intercropped. Three following treatments are established: black oat and annual ryegrass pastures grown as monocultures and an intercrop composed of these two species. Tillering dynamics were measured for black oat and annual ryegrass populations separately. When intercropped, tiller birth rates of black oat decreased (20.0 vs. 28.9 tillers 100 tillers−1) and those of annual ryegrass increased (30.5 vs. 14.3 tillers 100 tillers−1), compared to their monocultures. Tiller death rates for annual ryegrass did not differ between monoculture and intercropping (23.9 tillers 100 tillers−1), but black oat presented higher mortality in monocultures (48.8 vs. 36.4 tillers 100 tillers−1). The black oat monoculture had the lowest population stability index (0.80), whereas annual ryegrass in monoculture and intercropped pastures exhibited greater values (on average, 0.92). Our results indicated that black oat and annual ryegrass present distinct tillering dynamics whether grown as monoculture or intercropped, and suggest that intercropping species with elevated death rates (black oat) with later species (annual ryegrass) could be an important tool for maintaining pasture stability throughout the growing season.

Type
Research Article
Information
Experimental Agriculture , Volume 54 , Issue 6 , December 2018 , pp. 931 - 942
Copyright
Copyright © Cambridge University Press 2017 

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