Pore shape, size distribution and orientation in Bt horizons of two Alfisols with and without cohesive character from Brazil

Mota, Jaedson Claúdio Anunciato; Menezes, Ademir Silva; Nascimento, Carla Danielle Vasconcelos do; Alencar, Thiago Leite de; Júnior, Raimundo Nonato de Assis; Romero, Ricardo Espíndola; Costa, Mírian Cristina Gomes; Cooper, Miguel

doi:10.1016/j.geodrs.2018.e00197

Cited by 2 publications

(2 citation statements)

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“…Therefore, characteristics common to cohesive soils, such as the close arrangement of the particles, the large number of poorly connected and discontinuous micropores, high density and resistance to penetration (DANIELLS, 2012;MENEZES, et al, 2018;MOTA et al, 2018) may reduce pore functionality and efficiency in moving air and water in the soil, enhancing the effects on plant development of variations in the fraction of pores containing air.…”

Section: Resultsmentioning

confidence: 99%

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Gas exchange in maize as a function of aeration porosity in a cohesive soil

Marques

Mota

Lacerda

et al. 2021

Revista Ciência Agronômica

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Due to their physical characteristics, cohesive soils of either low or high aeration porosity can intensify limitations on plant cultivation. With the hypothesis that moist cohesive horizons where the soil has not yet reached a hard to extremely hard consistency may present a level of aeration porosity that affects gas exchange in maize plants, the aim of this study was to understand the influence of a cohesive horizon at different levels of aeration porosity on gas exchange in maize. The experiment was conducted in Fortaleza in the state of Ceará in a screened and covered environment, in a completely randomised block design with five levels of aeration porosity (AP) (0.04, 0.06, 0.09, 0.11 and 0.13 m 3 m -3 ) and six replications, giving a total of 30 experimental units. The variables under analysis were intrinsic permeability (K air ) and gas exchange. Increases in AP afforded an increase in K air . The AP of 0.04 and 0.13 m 3 m -3 reflected in lower values for the photosynthetic rate (A) (24.54 and 25.50 μmol CO 2 m 2 s -1 respectively) and internal CO 2 concentration (140.72 and 118.66 µmol mol -1 respectively). With the increase in AP, stomatal conductance and transpiration were reduced by 18% and 13.6% respectively, while the increase in instantaneous carboxylation efficiency was 19%, and intrinsic water use efficiency, 21%. It was concluded that variations in aeration porosity in cohesive soils affected gas exchange in maize plants. The AP of 0.04 and 0.13 m 3 m -3 reduced the value of A due to non-stomatal and stomatal limitations respectively.

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Section: Resultsmentioning

confidence: 99%

“…In addition, these soils usually have high values for root penetration resistance (PR) (MOTA et al, 2018). However, as the soil dries, this effect is enhanced, offering a greater obstacle to the roots, and hindering plant growth in soils where these horizons are present (DANIELLS, 2012).…”

Section: Introductionmentioning

confidence: 99%