Caespitosa and decumbens Poaceae fertilized with NPK: effects on soil aggregation

• Autor(a) principal: Almeida, Dácio Jerônimo de
• Data de Publicação: 2014
• Outros Autores: Silva, Ivandro de França da, Silveira, Flávio Pereira da Mota, Santiago, Robeval Diniz, Costa, José Ronaldo Calado
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Tropical (Online)
• Texto Completo: https://revistas.ufg.br/pat/article/view/24108
• topic: Urochloa sp.; granulometry; dry matter.; Urochloa sp.; granulometria; massa seca.

The disintegration of soil particles affects its productive capacity, resulting in compression, erosion and nutrient losses. This study aimed at evaluating the aggregates quality and stability of a Yellow Latosol, in a randomized blocks design represented by Urochloa decumbens and Urochloa brizantha, with and without mineral fertilization, and two sampling forms (rows and between rows), in three sampling depths. The undeformed soil samples collected were shattered and passed through a 9.52 mm sieve and, after drying, through a 2.00 mm, 1.00 mm, 0.50 mm and 0.25 mm sieves, according to the following diameters classes: 9.52-2.00 mm, 2.00-1.00 mm, 1.00-0.50 mm and 0.50-0.25 mm, by using dry sieving. These aggregates were also separated by wet sieving and the dispersed clay and root dry matter were determined. Aggregates larger than 2.00 mm showed high stability, in the 0.00-0.05 m layer, when compared to the aggregates from smaller classes, with no effect of sampling and fertilization site on the aggregates size and stability. There was no difference for the two species analyzed, sampling method and fertilization on the aggregates formation and stability.