Agregação de solo em pastagens sob diferentes índices de qualidade e sua influência na infiltração de água

Abstract

In Brazil, extensive livestock farming predominates, often in soils with low agricultural potential and susceptible to degradation, mainly in terms of physical aspects and water infiltration. Thus, this work aims to analyze the impact caused by the succession process in soil of different pasture areas, with an emphasis on their physical quality and physical-hydric characteristics, relating them to the role played by naturally observed ecosystem services. For this, 4 grazing areas were selected, in Red Ultisol, under different levels of natural succession: grazing in good visual conditions (PB); pasture under low scrub (CB); pasture under high scrub (CA); pasture under “capoeirão” (CAO), in the Ribeirão José Pereira microbasin (Itajubá - MG). The physical attributes were determined: soil density, porosity, size and stability of aggregates, as well as their classification as to the formation path. The infiltration analysis was carried out with the aid of a Guelph permeameter and the resistance to mechanical penetration of the soil with an impact penetrometer. For analysis of the results, analysis of variance and Tukey test at 5%, Pearson's correlation and multivariate statistics of main components were used. The natural succession in abandoned pastures improves the physical quality of the soil, with the production of larger, more stable aggregates and of biogenic formation over time. The areas could be classified according to their quality, in the following increasing order: PB < CB < CA < CAO, which respected the action of natural succession and, therefore, of ecosystem services.

Impasses Para a Gestão Da Economia Circular Na Agropecuária E Na Saúde Dos Solos Na Cidade De Boa Vista –Paraíba

“…No município de Boa Vista, situado na microrregião homogênea dos Cariris Velhos, semiárido paraibano, a posse de terra é uma característica marcante, em destaque para agricultura de subsistência e a pecuária leiteira, mas a forma como o solo é utilizado é o fator principal pra sua degradação, junto com a escassez hídrica (Pereira e Melloni, 2021). A ocupação do espaço agrícola, assim como as atividades pecuárias acontecem sem que se disponha de o mínimo de instrumento básico orientando as atividades de planejamento e uso de seus recursos naturais, intensificando os problemas nas áreas mais vulneráveis e de risco a desertificação (CHAGAS, 1999;SOUSA et al, 2007).…”