DSpace Communidade: Embrapa Meio Ambiente (CNPMA)
https://www.alice.cnptia.embrapa.br/alice/handle/item/22
Embrapa Meio Ambiente (CNPMA)2024-03-28T15:38:28ZReações das fontes de fosfato natural na produção da cana-de-açúcar em solo arenoso na cidade de Piracicaba, SP.
https://www.alice.cnptia.embrapa.br/alice/handle/doc/1163059
Título: Reações das fontes de fosfato natural na produção da cana-de-açúcar em solo arenoso na cidade de Piracicaba, SP.
Autoria: DIAS, V. G.; SILVA, F. C. da; CARVALHO, M. L.; MARCHIORI, L. S.; ANDRADE, C. A. de; RAIZER, A. J.
Conteúdo: O fósforo (P) é crucial para o sistema radicular da cana-de-açúcar, fornecendo energia e auxiliando na produção de sacarose. Este estudo analisou os efeitos de diferentes fontes e doses de adubos fosfatados no desempenho produtivo da cana-de-açúcar foi conduzido em Piracicaba-SP, em solo de baixa fertilidade com delineamento em blocos casualizados e quatro repetições, dez tratamentos e parcelas subdivididas com e sem aplicação do inoculante BiomaPhos, totalizando 80 parcelas. Os tratamentos foram: (T1 Testemunha 0; T2 Biochar 10 ton/ha + 150 kg deP2O5/ha via Superfosfato simples, T3 Torta 20 ton/ha + 75 kg deP2O5/ha via Superfosfato simples, T4 Pó de rocha 150 Kg/ha + 150 kg deP2O5/ha via Superfosfato simples, T5 Phosfato I9 150 Kg/ha + 150 kg deP2O5/ha via Superfosfato simples, T6 Gafsa 150 Kg/ha + 150 kg deP2O5/ha via Superfosfato simples, T7 Padrão P 50% (75 kg deP2O5/ha via Superfosfato simples), T8 Padrão P100% (150 kg deP2O5/ha via Superfosfato simples), T9 Padrão P 200% (300 kg deP2O5/ha via Superfosfato simples), T10 UPDT 15 Kg/ha+ 150 kg deP2O5/ha via Superfosfato simples. O solo foi amostrado 30 dias antes do início do ensaio, as plantas foram amostradas para análise foliar após quatro meses e colhidas após doze meses. A análise de variância mostrou efeito significativo dos tratamentos a 1%. Não foram observadas diferenças entre as subparcelas nem interação do BiomaPhos com as fontes de P. As produtividades foram baixas (54 TCH) devido à baixa fertilidade do solo e ao ciclo de 12 meses. O tratamento T3 apresentou a maior produtividade, possivelmente devido à umidade da torta, mas foi estatisticamente semelhante a T9, T4 e T6. Os resultados de ATR foram semelhantes, com média de 139,39 Kg, embora o tratamento T5 apresentasse a menor TCH, obteve o maior ATR. Em resumo, houve resposta à aplicação de fósforo no solo, especialmente no T3, que teve a maior produtividade (TCH) devido à agregação de matéria orgânica.2023-01-01T00:00:00ZN2O emission factors for nitrogen fertilizers and animal excreta in pastures: a meta-analysis for Brazil.
https://www.alice.cnptia.embrapa.br/alice/handle/doc/1162985
Título: N2O emission factors for nitrogen fertilizers and animal excreta in pastures: a meta-analysis for Brazil.
Autoria: PENTEADO, L. F.; NOGUEIRA, S. F.; ANDRADE, C. A. de; RAMOS, N. P.; PAZIANOTTO, R. A. A.; GAROFALO, D. T.
Conteúdo: Between 1985 and 2020, Brazil increased its pasture area by 38%, from 111 to 154 million hectares. In turn, N2O emissions from the agriculturallivestock sector in 2016 accounted for 87% of the total emissions of this gas in the country. The determination of N2O EF in national inventories is carried out using the values recommended by the IPCC, but there are limitations, since a default N2O EF is used for diverse nitrogen fertilizers, in different situations of livestock practices and edaphoclimatic conditions. This standardization of the EF, mainly for a country like Brazil with continental dimensions and with great edaphoclimatic diversity, can lead to future mistakes in the dimensioning of the N2O emissions caused by national livestock. Therefore, this review and metaanalysis study aimed to propose consistent and reliable N2O EFs for each type of nitrogen fertilizer and animal excreta in pastures in Brazil. The selection of studies was carried out through a systematic review by consulting the databases of online scientific articles: Web of Science, Scopus, and Scielo from December 2018 to August 2022. The queries used the search syntaxes: “Brazil” and “nitrous oxide emission” and “emission factor” and “pasture”, “pasturelands”, “grasslands”, “livestock”, and 20 articles were considered suitable for analysis, which had information about the EFs or experimental conditions that allowed the calculations of the EFs. The meta-analysis was performed using the methodology without weighting for variance, where the means and 95% confidence intervals for the EF were estimated using the bootstrap non-parametric resampling method. The mineral fertilizers evaluated in the studies were urea, ammonium nitrate, and ammonium sulfate presented EFs and confidence intervals (%) of 0.57 [0.46-0.68]; 1.16 [0.51-1.81] and 0.28 [0.13-0.43], respectively. As for animal excreta, results were found regarding feces, urine, and feces plus urine of 0.14 [0.12-0.16]; 0.75 [0.63-0.87]; 0.59 [0.34-0.84], respectively. The average value found for EFs from mineral fertilizers was 0.69 and from animal excreta was 0.48 compared to the default value of 1% by the IPCC. It is concluded that the values offered by the IPCC in relation to the N2O EF would overestimate the real values found in Brazilian pastures.2023-01-01T00:00:00ZNitrous oxide and methane emissions from soil under pasture fertilized with nitrogentrous oxide and methane emissions from soil under pasture fertilized with nitrogen.
https://www.alice.cnptia.embrapa.br/alice/handle/doc/1162983
Título: Nitrous oxide and methane emissions from soil under pasture fertilized with nitrogentrous oxide and methane emissions from soil under pasture fertilized with nitrogen.
Autoria: PENTEADO, L. F.; NOGUEIRA, S. F.; MOLINA, R. F.; DEUS, I. D. de; BARBOSA, C. M. P.; ANDRADE, C. A. de
Conteúdo: The contemporary global development model has been changing in order to reconcile productivity and sustainability. Harmonizing the environment and production fundamentally depends on the development and adoption of conservationist and sustainable agricultural practices. Livestock accounts for more than 60% of GHG emissions from the agricultural sector in Brazil, while nitrogen fertilization accounts for 35%, which are important aspects for promoting actions to reduce national emissions. The study will be divided into two parts: one in the field and another in the laboratory. In the field experiment, four nitrogen fertilization rates will be evaluated (0, 75, 150 e 300 kg N.ha-1 , in addition to a treatment with a dose of 150 kg N.ha-1 split (50+100 kg N.ha-1 ), regarding GHG emissions. The source of N will be ammonium nitrate, used in experimental plots of 14 x 14 m, with established pasture of Urochloa brizantha cv. Marandu. GHG emissions will be monitored using static chambers and periodic sampling after fertilization, until fluxes stabilize. The collected samples will be analyzed by gas chromatography. Next, the daily flows will be integrated and the data will be processed in order to verify the effect of N rates and split of fertilization on N2O flows and emission factor of this gas and the effect on CH4 emissions or consumption. For the laboratory research, 12 sources of N will be incubated with soil, under potentially favorable conditions for N2O emission (temperature of 28oC and soil moisture corresponding to 80% of the total pores filled with water). Nitrogen sources will include animal excreta (urine and feces), conventional mineral fertilizers, use of inhibitors and slow-release fertilizers. For about 90 days or until the gas flows stabilize, N2O and CH4 will be monitored. It is expected that the results generated in the research will be incorporated into the literature that supports more regionalized and customized N2O emission factors, contributing to the improvement of emission inventories and to the carbon accounting of livestock production systems.2023-01-01T00:00:00ZUso de função de pedotransferência para estimar a densidade do solo em áreas de produção de grãos no Brasil.
https://www.alice.cnptia.embrapa.br/alice/handle/doc/1162955
Título: Uso de função de pedotransferência para estimar a densidade do solo em áreas de produção de grãos no Brasil.
Autoria: ANDRADE, C. A. de; LUIZ, A. J. B.; CARNIER, J.
Conteúdo: A função de pedotransferência obtida com os dados do procarbono permite estimar com boa eficiência a densidade do solo e resulta em baixo erro no estoque de carbono.2023-01-01T00:00:00Z