Strategic grazing management and nitrous oxide fluxes from pasture soils in tropical dairy systems

Congio, Guilhermo Francklin de Souza; Chiavegato, M. B.; Batalha, Camila Delveaux Araujo; Oliveira, P. P. A.; Maxwell, Thomas M. R.; Gregorini, Pablo; Silva, Sila C. da

doi:10.1016/j.scitotenv.2019.04.186

Cited by 19 publications

(23 citation statements)

References 64 publications

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“…Stem proportion was similar between intensities in the upper stratum, and did not differ between strata under LGI. This supports that in guineagrass pastures managed under optimal grazing frequency (e.g., 95% canopy LI) (Congio et al., 2019), stem proportion does not play a major role in the upper stratum when LGI is imposed (Euclides et al., 2016). On the other hand, the HGI lower stratum presented 5.7‐fold greater stem proportion than the LGI, a response observed by others (Vendramini et al., 2019).…”

Section: Discussionsupporting

confidence: 80%

Herbage responses of Tamani and Quênia guineagrasses to grazing intensity

et al. 2020

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New forage cultivars require defoliation studies for recommending proper grazing management. Our objective was to characterize herbage accumulation (HA), plantpart composition and nutritive value of guineagrass [Megathyrsus maximus (Jacq.) B. K. Simon & S. W. L. Jacobs] rotationally stocked under two grazing intensities. The experimental design was a randomized complete block with three replicates of a 2 × 2 factorial arrangement of two guineagrass cultivars ('BRS Quênia' and 'BRS Tamani') and two grazing intensities. Heavy (HGI) and lax (LGI) grazing intensities were imposed as post-grazing stubble heights: 15 and 25 cm for Tamani, and 20 and 35 cm for Quênia, respectively. The experimental period was from -grazing HM was sampled as two strata above the stubble height, each comprising 50% of the sampled height (upper and lower stratum). Total herbage accumulation was similar across years, cultivars, and intensities (16,810 kg DM ha −1 ). Quênia and Tamani had the greatest HA during summer. The leaf proportion was least in the HGI pastures. Under HGI, the lower stratum of both cultivars had the greatest stem proportion and the least nutritive value. The greatest herbage CP concentration and the least NDF, ADF, iNDF and LIG concentrations occurred in the upper stratum. Based on these results, 35 and 55 cm are recommended as target heights for initiation of grazing, and 25 and 35 cm as post-grazing stubble heights for Tamani and Quênia, respectively.

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Section: Discussionsupporting

confidence: 80%

Herbage responses of Tamani and Quênia guineagrasses to grazing intensity

et al. 2020

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“…In this process, shading also occurs in the lower portion of the pasture, especially in the older leaves. This causes an increase in leaf senescence (Carnevalli et al, 2006;Congio et al, 2019), which may account for the greater dead leaf blade mass in the 30 cm deferred canopy than in the 15 cm canopy when N was not applied (Table 3).…”

Section: Resultsmentioning

confidence: 99%

Initial height and nitrogen fertilisation on deferred pastures of marandu palisadegrass

Nogueira

Santos

Carvalho

et al. 2020

SCA

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In deferred pastures, nitrogen fertilisation and pasture height at the beginning of the deferment period modify the structure and nutritive value of forage. This work was conducted to determine the nitrogen (N) doses and sward heights that were adequate for the deferment of Brachiaria brizantha cv. Marandu syn. Urochloa brizantha cv. Marandu (marandu palisadegrass). Two sward heights (15 and 30 cm) and four N rates (0, 40, 80,120 kg/ha) at the beginning of the deferment period were evaluated in a randomised block design and a factorial scheme with three replications. At the end of the deferment period, the numbers of live and dead tillers, the numbers of tillers with different sizes, the masses of live leaf lamina, dead leaf lamina, live stem and dead stem, the litter mass and the crude protein and neutral detergent fibre contents of the forage were evaluated. With nitrogen fertilisation, there was an increase in the masses of live leaf and live stem in the deferred canopy. With the application of 80 kg/ha of N, the litter mass was higher in the deferred canopy with a height of 30 cm, in relation to that with a height of 15 cm. The highest canopy presented greater stem mass and worse nutritional value when compared to the lowest one. In order to improve forage characteristics, marandu palisadegrass can be deferred by 15 cm and fertilised with 80 kg/ha N. When marandu palisade grass is deferred to 30 cm, nitrogen doses lower than 80 kg/ha can be applied.

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“…This position is strongly in agreement with a recent life cycle assessment (LCA) study at the study site (the NWFP), which found that amongst all sources of uncertainty surrounding carbon footprints of grazing enterprises, uncertainty associated with N 2 O EFs is the largest, and therefore hedging the risk through a mixed strategy would be a sensible approach ( Takahashi et al, 2019 ). In this context, other on-farm options that could contribute to the solution package include: light interception control through manipulation of sward structure ( Congio et al, 2019 ); fertiliser selection to enhance pasture growth and thus the stocking rate ( Louro et al, 2016 ); diet formulation to control N load and urination volume ( Marsden et al, 2016 ); and direct control of grazing intensity ( Tang et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Elucidating three-way interactions between soil, pasture and animals that regulate nitrous oxide emissions from temperate grazing systems

McAuliffe

López-Aizpún

Blackwell

et al. 2020

Agriculture, Ecosystems & Environment

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Highlights Urinary nitrogen concentrations were lowest on animals consuming high sugar grasses. However, soil under high sugar grasses recorded the highest N 2 O emissions. Synthetic urine generated N 2 O emissions inconsistent with locally collected urine. Differences in emissions amongst systems were explained by gene abundance ratios. Results indicate the importance of soil-pasture-animal-microbiome interactions.

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Strategic grazing management and nitrous oxide fluxes from pasture soils in tropical dairy systems

Cited by 19 publications

References 64 publications

Herbage responses of Tamani and Quênia guineagrasses to grazing intensity

Herbage responses of Tamani and Quênia guineagrasses to grazing intensity

Initial height and nitrogen fertilisation on deferred pastures of marandu palisadegrass

Elucidating three-way interactions between soil, pasture and animals that regulate nitrous oxide emissions from temperate grazing systems

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