Fluxos de água no consórcio milho-pastagem na microbacia hidrográfica do Rio Mundaú, Pernambuco

Machado, Cássia Bezerra; Lima, José Romualdo de Sousa; Antonino, Antônio Celso Dantas; Alves, Edevaldo Muguel; Souza, Eduardo Soares de; Ribeiro, Apolo Alves; Firmino, Francis Henrique Tenório

doi:10.21168/rbrh.v20n3.p731-740

Cited by 2 publications

(1 citation statement)

References 31 publications

(38 reference statements)

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“…Sabe-se que a ET é a principal saída de água de áreas com culturas agrícolas, pastagens e ecossistemas florestais (Silva et al, 2014;Machado et al, 2015;Silva et al, 2017).…”

Section: Introductionunclassified

Biochar de Lodo de Esgoto Aumenta a Produção e Eficiência no Uso de Água da Alface

Lima¹,

Araújo²,

Oliveira³

et al. 2020

Rev. Bras. Geog. Fis.

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O lodo de esgoto (LE) é um resíduo sólido, oriundo de Estações de Tratamentos de Esgoto (ETE), rico em matéria orgânica, sendo capaz de melhorar as propriedades físicas, químicas e biológicas do solo. Contudo, o LE pode apresentar em sua composição elementos tóxicos e agentes patogênicos que trazem malefícios para saúde humana e para o meio ambiente. A transformação do LE, por meio do processo de pirólise, em biochar pode ser uma boa alternativa tanto do ponto de vista agrícola, quanto do ambiental. Desse modo, o presente trabalho teve o objetivo de avaliar o efeito de biochar de lodo de esgoto (BLE) na eficiência do uso da água (EUA), na evapotranspiração e na produção da cultura da alface. O experimento foi realizado em casa de vegetação, no delineamento inteiramente casualizado, utilizando-se quatro tratamentos, consistindo de controle (sem biochar), BLE10 (10 t ha-1 de BLE), BLE20 (20 t ha-1 de BLE), BLE30 (30 t ha-1 de BLE), com três repetições. Foram avaliadas a biomassa, a evapotranspiração (ET) e a eficiência no uso de água (EUA) da alface. Não foram observadas diferenças significativas na ET da alface com a adição de BLE ao solo. Contudo, verificou-se que houve um aumento crescente da produção da alface e da EUA com o aumento das doses de BLE. Assim, o BLE mostrou-se uma interessante alternativa para uma destinação adequada do lodo de esgoto gerado nas ETE. Sewage Sludge Biochar Increases Yield and Water Use Efficiency in Lettuce A B S T R A C TSewage sludge (SS) is a solid residue, originating from Sewage Treatment Plants (STP), rich in organic matter, being able to improve the physical, chemical and biological properties of the soil. However, SS can present in its composition toxic elements and pathogenic agents that bring harm to human health and the environment. The transformation of SS, through the pyrolysis process, into biochar can be a good alternative both from an agricultural and environmental point of view. Thus, the present study aimed to evaluate the effect of sewage sludge biochar (SSB) on the water use efficiency (WUE) on evapotranspiration (ET) and on the yield of lettuce. The experiment was carried out in a greenhouse, in a completely randomized design, using four treatments, consisting of control (without SSB), SSB10 (10 t ha-1 of SSB), SSB20 (20 t ha-1 of SSB), SSB30 (30 t ha-1 SSB), with three repetitions. Fresh biomass, evapotranspiration (ET) and water use efficiency (WUE) of lettuce were evaluated. No significant differences were observed in the lettuce ET with the addition of SSB to the soil. However, it was found that there was an increase in the yield of lettuce and the WUE with increasing doses of SSB. Thus, the SSB proved to be an interesting alternative for an adequate destination of the sewage sludge generated in the STPs.Key words: Waste; evapotranspiration; carbon.

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“…Sabe-se que a ET é a principal saída de água de áreas com culturas agrícolas, pastagens e ecossistemas florestais (Silva et al, 2014;Machado et al, 2015;Silva et al, 2017).…”

Section: Introductionunclassified

Biochar de Lodo de Esgoto Aumenta a Produção e Eficiência no Uso de Água da Alface

Lima¹,

Araújo²,

Oliveira³

et al. 2020

Rev. Bras. Geog. Fis.

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Soil water dynamics and yield in maize and Brachiaria ruziziensis intercropping

Silva

Andrade

Cardoso

et al. 2020

Pesqui. Agropecu. Trop.

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ABSTRACT In intercropping systems, a high plant density can delay the biomass accumulation and affect the water availability to plants. This study aimed to evaluate the soil water dynamics and the crop yield performance in maize and Brachiaria ruziziensis intercropping under different sowing densities of the forage grass. The experiment was conducted in a randomized block design, with treatments associated to the sowing densities (2 kg ha-1, 4 kg ha-1, 6 kg ha-1 and 8 kg ha-1) and the single cropping for both species as controls. The maize plants were evaluated for grain yield and B. ruziziensis for number of plants per hectare and shoot fresh and dry matter. The intercropping performance was evaluated using the land-use efficiency index. The soil water dynamics was monitored in two soil depths (0-0.3 m and 0.3-0.6 m) by using the time domain reflectometry method. The evaluation of soil water storage was carried out from plots with four of the crop systems (single maize or B. ruziziensis, and intercropping with the extreme sowing densities), at four different times. The increase in the sowing density of B. ruziziensis decreased the grain yield of the intercropped maize by 30.8 %. The intercropping system using 2 kg ha-1 of the grass seeds resulted in the best land-use efficiency (23 %). In addition, the intercropping treatments promoted a higher extraction of water from the soil, mainly at the maize growth stages with higher hydric demand (e.g., flowering and grain filling). These systems stimulate the extraction of water from deeper soil layers, when compared to maize in single cropping.

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Fluxos de água no consórcio milho-pastagem na microbacia hidrográfica do Rio Mundaú, Pernambuco

Cited by 2 publications

References 31 publications

Biochar de Lodo de Esgoto Aumenta a Produção e Eficiência no Uso de Água da Alface

Biochar de Lodo de Esgoto Aumenta a Produção e Eficiência no Uso de Água da Alface

Soil water dynamics and yield in maize and Brachiaria ruziziensis intercropping

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