Soil aggregation in a crop-livestock integration system under no-tillage

Revista Brasileira de Ciência do Solo

Edicarlos Damacena De Souza¹  Sérgio Ely Valadão Gigante De Andrade Costa¹  Ibanor Anghinoni²  Paulo César De Faccio Carvalho¹  Eric Victor Ferreira De Oliveira¹  Amanda Posselt Martins¹  Eduardo Cao¹  Marcelo Andrighetti¹ 

[1] ,UFRGS Department of Soil Science

关键词: black oat;    Italian ryegrass;    mean weighted diameter;    soil structure;    aveia-preta + azevém;    diâmetro médio ponderado;    estrutura do solo;   

DOI  :  10.1590/S0100-06832010000400033

来源: SciELO

【 摘 要 】

Grazing intensities can influence soil aggregation, which can be temporarily and permanently affected. The objective of this study was to evaluate the aggregate stability in water at the end of a soybean cycle and during pasture development in a crop-livestock integration system under no-tillage and grazing intensities. The experiment was initiated in 2001, in a dystrophic Red Latosol, after soybean harvest. Treatments consisted of pasture (black oat + Italian ryegrass) at heights of 10, 20 and 40 cm, grazed by young cattle, and a control (no grazing), followed by soybean cultivation, in a randomized block design. Soil samples were collected at the end of the soybean cycle (May/2007), during animal grazing (September/2007) and at the end of the grazing cycle (November/2007). The grazing period influences aggregate distribution, since in the September sampling (0-5 cm layer), there was a higher proportion of aggregates > 4.76 mm at all grazing intensities. Soil aggregation is higher in no-tillage crop-livestock integration systems in grazed than in ungrazed areas.

【 授权许可】

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