Seasonal herbage accumulation and canopy characteristics of novel and standard brachiariagrasses under N fertilization and irrigation in southeastern Brazil

Lara, Márcio André Stefanelli; Silva, Valdson José da; Sollenberger, Lynn E.; Pedreira, Carlos Guilherme Silveira

doi:10.1002/csc2.20353

Cited by 6 publications

(24 citation statements)

References 22 publications

(31 reference statements)

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“…This suggests that Zuri produces forage with less stem proportion, which may contribute to greater forage nutritive value (Pedreira et al., 2017), although stems are important components of HA in tropical grasses (Lemaire et al., 2009). The stem elongation may also allow greater light penetration within the canopy, contributing to greater growth rate (Lara et al., 2021), whereas the lesser participation of stems in the herbage mass may contribute to reduced HAR.…”

Section: Resultsmentioning

confidence: 99%

Herbage accumulation and tillering dynamics of ‘Zuri’ guineagrass under rotational stocking

et al. 2021

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Understanding the effects of grazing management on tillering dynamics of forage grasses may help identify management practices that optimize pasture production, stability, and ultimately, persistence. The objective of this research was to evaluate the effects of two grazing frequencies (regrowth interrupted when the canopy was 70 cm tall or at 95% canopy light interception [LI]) and two grazing intensities (reduction of 29 [lenient] or 57% [standard] of initial canopy height) in ‘BRS Zuri’ guineagrass [Megathyrsus maximus (Jacq.) B.K. Simon & S. W. L Jacobs (syn. Panicum maximum Jacq.)], under rotational stocking and on herbage accumulation rate (HAR), tiller appearance rate, tiller mortality, tiller survival rate, tiller stability index (SI), tiller population density (TPD), tiller mass (TM), apical meristem height, and tiller half‐life during two summer rainy seasons in Piracicaba, Brazil. The experimental design was randomized complete block, with a 2 × 2 factorial arrangement. The HAR was not affected by treatments in the first year, averaging 100 kg dry matter ha−1 d−1, but was greater under lenient than standard grazing (146 and 81 kg dry matter ha−1 d−1, respectively) in the second year. In both years, there were no treatment effects on TPD and TM. The use of 95% LI associated with standard defoliation increased the variability in SI. Great tiller population renewal indicated by short tiller half‐life, varying from 31 to 75 d, classifies Zuri as an exploitative cultivar. Zuri guineagrass maintained tiller SI under the grazing treatments imposed but had greater HAR under lenient grazing.

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Section: Resultsmentioning

confidence: 99%

Herbage accumulation and tillering dynamics of ‘Zuri’ guineagrass under rotational stocking

et al. 2021

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“…This occurred due to greater stem elongation, which contributed to a greater quantity of herbage above the stubble height, and more favorable conditions for dead material decomposition (Herrera et al, 2020). Greater FAR was measured in Capiporã and Xaraés during the warm season due to more erect structure than other grasses, and both presented greater canopy height, forage and leaf accumulation (Lara et al, 2020). Xaraés and Capiporã had greater SHM and FAR above stubble height indicating that these genotypes show greater potential of forage production, and their structure allows better use of the accumulated forage.…”

Section: Discussionmentioning

confidence: 98%

“…Adaptation of grasses to environmental conditions may include allocation of photosynthates to stubble and/or belowground mass, and this may affect the regrowth potential and forage accumulation of brachiagrasses (Lara et al., 2020). Brachiariagrasses generally allocate organic reserves to the stem bases and roots (Pedreira et al., 2017; Rodrigues et al., 2007; Silva et al., 2016b), but presence of more leaf in the stubble may reduce the dependence on storage reserves to fuel regrowth (Donaghy & Fulkerson, 1997).…”

Section: Introductionmentioning

confidence: 99%

Regrowth of brachiariagrasses as related to stubble characteristics under N fertilization and irrigation

et al. 2022

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Seasonal and annual changes in stubble characteristics can affect the regrowth of warm‐season perennial grasses. Understanding these changes and their effects on forage accumulation rate (FAR) can improve defoliation management. Our objective was to describe and relate variations in stubble characteristics with FAR during regrowth of four palisadegrasses [Brachiaria brizantha (Hochst. Ex A. Rich.) Stapf. syn. Urochloa brizantha (Hochst. ex A. Rich.) R.D. Webster], genotypes Marandu, Xaraés, Arapoty, and Capiporã, and one signalgrass [Brachiaria decumbens (Stapf.) syn. Urochloa decumbens (Stapf.) R.D. Webster] cultivar Basilisk, in southeastern Brazil. Plots were harvested at 15‐cm stubble height every 28 d during the warm season and 42 d during the cool season of years 2005–2006 and 2007–2008. Stubble mass was ∼1,070 kg DM ha−1 greater in the cool than warm season, whereas FAR was less in the cool season. Arapoty and Basilisk showed generally less FAR (∼45 kg d−1) and stubble leaf, stem, dead material, and total mass during the warm season than more productive grasses Capiporã and Xaraés (∼63 kg d−1). Leaf and canopy photosynthesis varied over seasons and years, but they were similar among grasses despite differences in stubble characteristics and FAR. Marandu accumulated more leaf in the stubble than other grasses, resulting in greater residual leaf area index, but it did not increase FAR. Under less favorable growth conditions, grasses increased stubble herbage mass (SHM). More productive grasses generally present greater SHM and leaf mass, indicating that stubble characteristics play an important role in the regrowth of brachiariagrasses.

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“…Regional studies [30,[35][36][37][38][39][40][41][42][43][44][45] support the alteration of the default values of some key parameters (i.e., curve number, universal soil loss equation's cover management factor, and plant growth parameters) to adequately represent the study area's conditions (Tables S3-S6). Moreover, a management calendar was developed for eucalyptus plantations according to the productive model most traditionally adopted in the region.…”

Section: Model Setupmentioning

confidence: 99%

“…The codes RFLO and PMAN represent two new land use classes added to the SWAT database to represent a condition of managed eucalyptus and pasture use. The parameters altered to represent those conditions were the curve number [45]; universal soil loss equation cover management factor value [44]; maximum and minimum leaf area index [41]; maximum canopy water storage [49]; initial leaf area index [41]; initial dry weight biomass [49] (Table S7). The percent area occupied by each land use type for each scenario is indicated in Table 3.…”

Section: Lulc Scenariosmentioning

confidence: 99%

How Far Can Nature-Based Solutions Increase Water Supply Resilience to Climate Change in One of the Most Important Brazilian Watersheds?

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Moraes

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et al. 2022

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Water resources are paramount for the maintenance of the Earth’s system equilibrium; however, they face various threats and need increased conservation and better management. To restore water resources, nature-based solutions can be applied. Nevertheless, it is unclear which solution promotes greater water supply resilience: restoring riparian vegetation, improving management practices in key areas for water recharge, or both? In addition, how significant are these results in the face of climate change effects? To answer this, we used the SWAT (Soil and Water Assessment Tool) model to simulate and compare four different land use scenarios under three climate conditions (i.e., observed climate and two of the IPCC’s future climate projections). Focusing on key areas contributed more to increasing water supply resilience than forest restoration. Applying both solutions, however, yielded the greatest increases in resilience and groundwater recharge and the greatest decreases in surface runoff and sediment loads. None of the solutions caused a significant difference in streamflow and water yield. Furthermore, according to both of the IPCC climate projections evaluated, by the end of this century, the average annual streamflow will be lower than the historical mean for the region. Climate adaptation strategies alone will be insufficient to ensure future water access, highlighting the need for implementing drastic mitigation actions.

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Seasonal herbage accumulation and canopy characteristics of novel and standard brachiariagrasses under N fertilization and irrigation in southeastern Brazil

Cited by 6 publications

References 22 publications

Herbage accumulation and tillering dynamics of ‘Zuri’ guineagrass under rotational stocking

Herbage accumulation and tillering dynamics of ‘Zuri’ guineagrass under rotational stocking

Regrowth of brachiariagrasses as related to stubble characteristics under N fertilization and irrigation

How Far Can Nature-Based Solutions Increase Water Supply Resilience to Climate Change in One of the Most Important Brazilian Watersheds?

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