Calagem E Adubação No Crescimento Do Capim Mombaça Em Rorainópolis, Roraima

Souza, J. G. de.; Aires, Francisco Péricles Galúcio; Gomide, Plínio Henrique Oliveira; Nunes, Járisson Cavalcante

doi:10.24979/376

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…As for importance, the soils of this region present a high value for the social, environmental, agricultural and economic context of the state (Alves et al, 2020). Besides the very relevant livestock production, the region also stands out in the agricultural sector, with great representation at the national level in the production of grains such as rice, soy, and corn (Souza et al, 2020). In addition, the region lies within the Amazon biome, which is highly diverse and is currently being modified by agricultural advances, altering the vegetation and, consequently, the atmosphere and soils (Condé & Tonini, 2013).…”

Section: Introductionmentioning

confidence: 99%

Polycyclic soils with Bt and Bw developed on mafic rocks in a forest cerrado transition environment in Roraima, northern Amazon, Brazil

Júnior

Schaefer²,

Sousa³

et al. 2022

Agraria

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In the extreme north of Brazil, in Roraima, there is an important set of mafic, volcanic or plutonic rocks, associated with the Juro-Cretaceous magmatism, and one of the most extensive areas is the Colônia do Taiano region, the first agricultural colony of Roraima. In addition to basalts, many diabases and diorites occur, forming an extensive patch of soils with good agricultural suitability, in the cerrado-forest transition. Two soil profiles developed from diabase were studied, after selecting the most representative pedons of the area. P1, an Argissolo Vermelho Eutrófico latossólico (Ultisol) and P2 an Argissolo Vermelho Eutrófico típico (Ultisol), were described and collected. Morphological, physical, chemical, mineralogical analyses, and extraction of Fe, Al, Ti and Si oxides by sulfuric attack were carried out; Fe 2 O 3 , Al 2 O 3 , TiO 2 , and SiO 2 , by plasma emission spectrometry; and Fe-DBC (dithionite-citrate-bicarbonate) and Fe ammonium oxalate. The soils presented a typical latosolic morphology at the base of the profile, with the top of the B horizon showing waxiness varying from moderate to abundant, thus revealing a polycyclic genesis of Bt superimposed on Bw, formed in a previous cycle. The SiO 2 contents indicated a desilication process, and the low contents of trace elements and TiO 2 showed mafic materials poor in magnetite, and reworking of the parent material by pediment in a drier climate. The Feo/Fed ratio proved to be atypical for the Amazon region, consistent with the mafic lithology.

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Section: Introductionmentioning

confidence: 99%

Polycyclic soils with Bt and Bw developed on mafic rocks in a forest cerrado transition environment in Roraima, northern Amazon, Brazil

Júnior

Schaefer²,

Sousa³

et al. 2022

Agraria

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Phosphate Fertilization Without Pasture Burning Increase Biomass Productivity and Reduce Carbon Loss

Silva,

Almeida Lobo

2024

RGSA

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Objective: In this work we evaluate the phosphorus fertilization without burning on the biomass productivity and the reduction of carbon loss from the pasture of Brachiaria brizantha in the Brazilian Amazon. Theoretical Framework: Brachiaria brizantha is the main cultivated pasture species in Brazil. The overgrazing and no nutrient replenishment in addition to the periodical burnings are the trigger factors of a gradual degradation since the 70’s in the Amazon. That fact suggests the need for research solutions to eliminate the use of this practice for pasture management. Method: A field experiment was carried out from September to November 2015 in a completely randomized blocks design. The treatments consisted of unburned pasture treated with 0, 25, 100 and 200 kg ha-1 of phosphorus compared to the pasture burning, with 4 blocks and 20 experimental plots. The experimental plots treated with phosphorus received agronomic doses of potassium and nitrogen applied on the soil surface. After applying the treatments, including the burning, the pasture was desiccated in order to homogenize the plant emergence and growth after the period without rain from July to September. Results and Discussion: The soil fertility attributes, components of biomass productivity, partial carbon stocks and the partial carbon retained in the pasture (not lost as carbon dioxide) were quantified at 56 days after the beggining of the experimental period. In comparison to the pasture burning, the treatments alter the soil phosphorus availability and, as a result, increase the partial biomass productivity and its carbon content, reducing the loss of carbon dioxide to the atmosphere. Research Implications: The practical and theoretical implications of this research are discussed, providing insights into how the results can be applied or influence practices in the field of pasture management without fire using. These implications could encompass on how to apply and how much of an alternative phosphate must be applied to the soil in order to supply phosphorus for B. brizantha instead of using fire as a strategy of pasture management. Originality/Value: This study contributes to the literature by highlighting the superiority of phosphorus application from alternative source allied to N and K fertilization compared to the pasture burning practice in the Southwestern Amazon. This innovative approach can be used as a base for new researches and applied in the level of cattle farmers.

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Calagem E Adubação No Crescimento Do Capim Mombaça Em Rorainópolis, Roraima

Cited by 2 publications

References 14 publications

Polycyclic soils with Bt and Bw developed on mafic rocks in a forest cerrado transition environment in Roraima, northern Amazon, Brazil

Polycyclic soils with Bt and Bw developed on mafic rocks in a forest cerrado transition environment in Roraima, northern Amazon, Brazil

Phosphate Fertilization Without Pasture Burning Increase Biomass Productivity and Reduce Carbon Loss

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