Canopy height and its relationship with leaf area index and light interception in tropical grasses

Coêlho, Janerson José; Dubeux, José C. B.; Santos, Erick R. S.; Neto, João Manoel Carneiro Leão; Cunha, Márcio Vieira da; Santos, Mércia Virgínia Ferreira dos; Mello, Alexandre Carneiro Leão de; Lira, Mário de Andrade

doi:10.17138/tgft(2)31-32

Cited by 9 publications

(7 citation statements)

References 3 publications

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“…Nevertheless, it is worth pointing out that the edaphoclimatic variations and the different biomes of Brazil can modify the relations between light interception and LAI; and consequently, modify the critical lAI. Thus, grazing management should be modified likewise (COÊLHO et al, 2014).…”

Section: Grazing Managementmentioning

confidence: 99%

Tall and short-sized elephant grass genotypes: morphophysiological aspects cut-and-carry, and grazing management

et al. 2021

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Elephant grass (pennisetum purpureum schum.) has been grown only in cut-and-carry systems for a long time. However, interest in its grazing management has been increasing because of the selection of short-sized genotypes, which have gained new relevance since 1988 with the registration of ‘mott’ grass. in this sense, tall and short-sized genotypes present important differences in morphology, quality and productivity; although, environmental factors also exert influence on these aspects. This review aimed to approach how the elephant grass size can influence the morphophysiological characteristics, management decisions, and exploitation of this species. the morphophysiological aspects and the elephant grass sizes are important to direct their utilization in the different production systems. The research results from previous decades suggest that the particularities of the tall-sized genotypes, such as great forage accumulation, high organic reserves content, and stem elongation, favor their management in cut-and-carry systems and industrial sectors. Conversely, the short-sized elephant grass genotypes present aspects as higher leaf proportion in the harvested forage, leaf/stem ratio, and tillering. these factors facilitate their exploitation in grazing systems.

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Section: Grazing Managementmentioning

confidence: 99%

Tall and short-sized elephant grass genotypes: morphophysiological aspects cut-and-carry, and grazing management

et al. 2021

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“…Thus, to better account for the amount of material that was not used by the animals, a harvesting efficiency index was quantified in 2013. Some have recommended using canopy height as a proxy for light interception of tropical grasses (Carnevalli et al, 2006;Barbosa et al, 2007;Sbrissia et al, 2007), while others have found that canopy height seldom correlated well with light interception and leaf area index across several species (Coêlho et al, 2014). The LI80 treatment had a harvesting efficiency index of 0.74, compared with 0.59 for LI95.…”

Section: Pre-grazing Canopy Height and Sward Bulk Densitymentioning

confidence: 99%

Performance of Limpograss Breeding Lines under Various Grazing Management Strategies

Wallau

Sollenberger

Vendramini³

et al. 2016

Crop Science

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Limpograss [Hemarthria altissima (Poir.) Stapf et C.E. Hubb.] is a C4, perennial, stoloniferous grass that is well adapted to poorly drained soils and grows throughout frost‐free periods during winter in southern Florida. Its use has increased rapidly in recent decades, but nearly all area in cultivation is planted with one cultivar, ‘Floralta’. A breeding program was initiated to develop improved alternatives to Floralta, resulting in a group of breeding lines requiring evaluation under grazing. The objective of this research was to evaluate the performance of five limpograss breeding lines (1, 4F, 10, 32, and 34) under combinations of grazing frequency and intensity. During the 2012 and 2013 growing seasons, those lines, plus Floralta, were tested at two pre‐grazing canopy light interception levels (80 and 95%), that triggered the initiation of each grazing event, and two post‐grazing stubble heights (20 and 30 cm). Lines 4F and 10 had greater herbage accumulation, apparent herbage harvested, and persistence than Floralta. Initiation of grazing at 80% canopy light interception resulted in more frequent grazing events, a longer grazing season, shorter pre‐grazing canopy height, greater leaf percentage, less herbage bulk density, and greater herbage crude protein concentration compared with 95% canopy light interception. These data support cultivar release of breeding lines 4F and 10 and suggest that persistence and efficient utilization of limpograss under rotational stocking can likely be achieved by initiating grazing at a pre‐grazing canopy height of ∼60 cm, well before 95% canopy light interception, and by ending grazing at a post‐grazing canopy height of ∼30 cm.

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“…In this way, there was a positive contribution to improving estimation, and all p-values were <0.01, except the one for soybean (Table 4). Galzerano et al (2012) and Coêlho et al (2014) also found a good correlation between canopy height and determinations of the LAI; however, these authors evaluated tropical grasses.…”

Section: Resultsmentioning

confidence: 97%

Improving indirect measurements of the leaf area index using canopy height

Gonçalves

Silva

Gasparotto

et al. 2020

Pesq. agropec. bras.

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The objective of this work was to evaluate the use of plant height as a calibration variable for improving indirect measurements of the leaf area index (LAI). Three experiments were conducted with different crops - corn (Zea mays), soybean (Glycine max), and sugarcane (Saccharum officinarum) -, to compare the performance of the LAI measured indirectly (LAIind) and corrected by the calibration variable with the LAI measured directly (LAIref). Without the proposed correction, the LAIind tended to be overestimated by 20%, on average, compared with the LAIref, for the three crops. After crop height was used to adjust the LAIind, a strong positive relationship was observed between the LAIref and the corrected LAIind (R2 = 0.96); overestimation was reduced to 4% and the root-mean-square error decreased to 0.35 m2 m-2. The variable canopy height is promising for the correction of the LAI of the soybean, corn, and sugarcane crops.

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Canopy height and its relationship with leaf area index and light interception in tropical grasses

Cited by 9 publications

References 3 publications

Tall and short-sized elephant grass genotypes: morphophysiological aspects cut-and-carry, and grazing management

Tall and short-sized elephant grass genotypes: morphophysiological aspects cut-and-carry, and grazing management

Performance of Limpograss Breeding Lines under Various Grazing Management Strategies

Improving indirect measurements of the leaf area index using canopy height

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