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Sward structural characteristics and herbage accumulation of Piat palisade grass (Brachiaria brizantha) in a croplivestockforest integration area

Sward structural characteristics and herbage accumulation of Piat palisade grass (Brachiaria... The aim of this study was to evaluate the effects of shading on structural characteristics and herbage accumulation of palisade grass (Brachiaria brizantha cv. Piat), in a croplivestockforest integration area. Three shade regimes were evaluated: no shade (NS), moderate shade (MS, 338 trees ha1), and intense shade (IS, 714 trees ha1). The effects of shade regime on soil-water content and nitrogen nutrition index were also evaluated. Grazing management was established based on sward light interception targets (95% LI pre-gazing). The MS and IS regimes were divided into two shade strips (central and lateral) in order to describe the variation in light availability within the paddocks. Two methods for taking the reference readings of LI were tested in IS paddocks: LI reading inside (under the tree canopy) and outside (under full sunlight) the experimental area. Increased tree density reduced photosynthetically active radiation on lateral and central shade strips by 37% and 12% for MS, and 52% and 50% for IS, respectively. For NS, MS, IS (outside) and IS (inside), grazing intervals were 23, 26, 28 and 35 days, pre-grazing heights corresponded to 33, 35, 43 and 52cm, and pre-grazing herbage mass to 5.37, 4.44, 2.96 and 3.23 t ha1, respectively. Leaf percentage remained relatively stable across shade regimes, but stem percentage was greater and dead material percentage was smaller for IS than for NS and MS. Soil water content was lower near the trees, especially during the dry season. Relative to NS, herbage accumulation decreased by 39% and 68% for MS and IS, respectively. Under natural shade, small variations in light availability affect sward structure and herbage production. The use of the 95% LI target developed under full sunlight conditions is not suitable for use under trees, emphasising the need to generate specific grazing-management targets for pastures cultivated under trees. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crop and Pasture Science CSIRO Publishing

Sward structural characteristics and herbage accumulation of Piat palisade grass (Brachiaria brizantha) in a croplivestockforest integration area

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References (69)

Publisher
CSIRO Publishing
Copyright
Copyright © The Author(s). Published by CSIRO Publishing
ISSN
1836-0947
eISSN
1836-5795
DOI
10.1071/CP16341
Publisher site
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Abstract

The aim of this study was to evaluate the effects of shading on structural characteristics and herbage accumulation of palisade grass (Brachiaria brizantha cv. Piat), in a croplivestockforest integration area. Three shade regimes were evaluated: no shade (NS), moderate shade (MS, 338 trees ha1), and intense shade (IS, 714 trees ha1). The effects of shade regime on soil-water content and nitrogen nutrition index were also evaluated. Grazing management was established based on sward light interception targets (95% LI pre-gazing). The MS and IS regimes were divided into two shade strips (central and lateral) in order to describe the variation in light availability within the paddocks. Two methods for taking the reference readings of LI were tested in IS paddocks: LI reading inside (under the tree canopy) and outside (under full sunlight) the experimental area. Increased tree density reduced photosynthetically active radiation on lateral and central shade strips by 37% and 12% for MS, and 52% and 50% for IS, respectively. For NS, MS, IS (outside) and IS (inside), grazing intervals were 23, 26, 28 and 35 days, pre-grazing heights corresponded to 33, 35, 43 and 52cm, and pre-grazing herbage mass to 5.37, 4.44, 2.96 and 3.23 t ha1, respectively. Leaf percentage remained relatively stable across shade regimes, but stem percentage was greater and dead material percentage was smaller for IS than for NS and MS. Soil water content was lower near the trees, especially during the dry season. Relative to NS, herbage accumulation decreased by 39% and 68% for MS and IS, respectively. Under natural shade, small variations in light availability affect sward structure and herbage production. The use of the 95% LI target developed under full sunlight conditions is not suitable for use under trees, emphasising the need to generate specific grazing-management targets for pastures cultivated under trees.

Journal

Crop and Pasture Science – CSIRO Publishing

Published: Oct 24, 2017

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