ABSTRACT Assess the physical quality of agricultural soils it is important to establish the management more adequate for plant growth. In this study, the soil water retention curve and S index as indicators of soil physical quality were evaluated in five integrated production systems in the following forestry arrangements: Eucalyptus in a single line, double line and triple line (Eucalyptus I, II and III respectively), Balsa in triple line and Teak triple line. The density and arrangement of forest trees influence the soil physical properties. Less soil water retention was observed in the Teak and Balsa wood systems in the layers 0-0.10 and 0.10-0.20 m. The field capacity, permanent wilting point, and available water were lower under the projection from the treetops, providing less soil water retention at this site. This position suffers more influence of the animal's footstep, having greater alterations on the soil structure. Integrated production systems showed poor soil structural quality based on the S index, averaging 0.034 and 0.035 for layers 0-0.10 and 0.10-0.20 m respectively.

Propôs-se, neste trabalho, determinar alterações nos atributos físicos do solo como resultado da implantação de sistemas de integração lavoura-pecuária-floresta (iLPF) e identificar aqueles adequados para detecção na mudança da qualidade física do solo (QFS). Amostras de solo foram coletadas nas camadas de 0-0,10 e 0,10-0,20 m em Nova Canãa do Norte, MT, e em Cachoeira Dourada, GO, em áreas sob iLPF com 1 (iLPF1) ou 3 (iLPF3) linhas de eucalipto e em áreas de pastagem recuperada e degradada. No iLPF1 as amostragens foram feitas na linha de árvores e a 2,5; 5,0 e 10,0 m dessa linha. No iLPF3, em Nova Canãa, as amostragens foram feitas na linha central e a 3,0; 6,0; 9,0 e 12,0 m dessa linha e, em Cachoeira Dourada, na linha central e a 1,5; 3,0; 4,5; 6,0 e 9,0 m dessa linha, com cinco repetições. Os sistemas iLPF promoveram melhoria na QFS em relação à pastagem degradada. Em Nova Canãa o iLPF1 propiciou melhor recuperação da QFS em relação à pastagem degradada, do que o iLPF3. A QFS nos sistemas iLPF variou com a posição de amostragem em relação à linha de árvores. A densidade e o arranjo poroso do solo na camada 0,10-0,20 m foram os principais responsáveis por discriminarem os sistemas integrados da pastagem degradada.

This study aimed to determine changes in soil physical attributes as result of implementation of integrated crop-livestock-forest (iCLF) systems and to identify atributes suitable for the detection of changes in soil physical quality (SFQ). Soil samples were collected in 0-0.10 and 0.10-0.20 m layers in Nova Canãa do Norte, MT, and Cachoeira Dourada, GO, in areas under iCLF with 1 (iCLF1) or 3 (iLCF3) lines of eucalyptus in areas of recovered and degraded pastures. In iCLF1, the samples were collected from the tree line and at 2.5, 5.0 and 10.0 m of this line. In iCLF3, in Nova Canãa do Norte, the samples were collected from the middle line and at 3.0; 6.0; 9.0 and 12.0 m of this line, and in Cachoeira Dourada, from the middle line and at 1.5; 3.0; 4.5; 6.0 and 9.0 m of this line, with five replications. iCLF systems promoted improvement in SFQ regarding degraded pasture. In Nova Canãa do Norte, iCLF1 provided better recovery in SFQ, relative to degraded pasture, than iCLF3. The SFQ in iCLF systems varied with the sampling position relative to the line of trees. Bulk density and pore arrangement in the 0.10-0.20 m soil layer were mainly responsible for discriminating integrated systems from degraded pasture.