Least limiting water range of Udox soil under degraded pastures on different sun-exposed faces

Abstract

A b s t r a c t. The efficient use of water is increasingly important and proper soil management, within the specificities of each region of the country, allows achieving greater efficiency. The South and Caparaó regions of Espírito Santo, Brazil are characterized by relief of 'hill seas' with differences in the degree of pasture degradation due to sun exposure. The objective of this study was to evaluate the least limiting water range in Udox soil under degraded pastures with two faces of exposure to the sun and three pedoenvironments. In each pedoenvironment, namely Alegre, Celina, and Café, two areas were selected, one with exposure on the North/West face and the other on the South/ East face. In each of these areas, undisturbed soil samples were collected at 0-10 cm depth to determine the least limiting water range. The exposed face of the pasture that received the highest solar incidence (North/West) presented the lowest values in least limiting water range. The least limiting water range proved to be a physical quality indicator for Udox soil under degraded pastures.

Pastures Degradation and the Relation with Pedo-Geomorphological Attributes in Watershed

“…On a local scale, solar radiation is a factor that has a very close relation to the topography, the radiation is modified according to inclination, surface orientation and the shape of the land (Kumar et al, 1997, Passos et al, 2017. Thus, the surfaces facing north, probably exposed to a higher level of solar radiation, presented higher levels of pasture degradation, confirmed by the fact that the increase in radiation also leads to an increase of pasture degradation with the soil characteristics of the studied area.…”

“…These variations in area occur as positive attribute variations are noticed. below the tropics the hillsides of the relief facing north receive more energy compared to those facing south, resulting in a greater evapotranspiration potential, lower humidity content and, while studying pastures, Passos et al (2017) noticed a higher degradation in these areas associated to an increase of the soil temperature.…”

“…The pasture with a very strong degradation level (P4) had the second largest area in the surface of the relief. The hillsides on the southern hemisphere facing north and west tend to receive more irradiations, presenting lower levels of soil humidity, microbial activity and organic matter content, even if the soil's categories are not altered (Chagas et al, 2013;Passos et al, 2017).…”

Tráfego de máquinas agrícolas em cultivo de palma de óleo

“…A significância das variáveis θ e Ds nos valores de RP foi demonstrada pelo teste t. O sinal negativo no parâmetro b comprova a relação negativa entre a θ e a RP, enquanto que o sinal positivo no parâmetro c evidencia que a RP é diretamente proporcional a Ds. Este comportamento é confirmado e discutido por diversos autores (Passos et al, 2017;Sato et al, 2015). O maior valor absoluto de t para o parâmetro b nas duas camadas sugere que as variações da RP são mais influenciadas pela θ em comparação a Ds.…”

Modelagem Espaço-Temporal De Ilhas De Calor Urbana E Correlação Com Variáveis- Montes Claros, Mg, Brasil

“…Considerando alguns dados topográficos, faces de exposição de vertente, exemplifica bem a influência na dinâmica de temperatura. Faces com direção para Norte e Oeste tem maior incidência de radiação solar no hemisfério sul, com predisposição ao aumento de temperatura (Passos et al, 2017;Souza et al, 2019). Outro aspecto é a presença de umidade do solo, um atenuador do aumento da temperatura (Martilli et al, 2020), e dados advindos de MDE indicar áreas de umidade mediantes feições topográficas (Raduła et al, 2018).…”