Resistência mecânica à penetração em sistemas de manejo do solo

Abstract

The diference soil management systems, can result in soil physical changes, such as the formation of compacted layers. One of the physical attributes most used as indicative of soil compact, has been the soil mechanical resistence to penetration, because it has direct relation with the growth of plants, and to be more efficient in identifying soil compaction stats. In this sense, the objective was evaluate the mechanical resistence to penetration in two soil management systens, by means of the use penetration technique. The experiment was carried out in the area of the University Federal Rural of Amazonia, Campus Parauapebas. The experiment design was completely randomized with two types of management no tillage system (NTS) and conventional plating system (CPS) with 40 replicate trataments. The soil resistance to penetration (PR) was measured using the Falker-brand Electronic Pressure Compaction Meter PenetroLOG - PLG 1020, at a depth of 0,00 to 0;40 m, which was subdivided into eight layers of 0,05 m for evaluation. The adoption of no-tillage and conventional tillage systems caused oscillation in the soil mechanical resistance to penetration along the soil layers. In the CPS, a lower RP was observed when compared to the other treatment, at depth 0,00 – 0,10 m. Differently, in the NTS, the sublayers of 0,15 – 0,25 m presented lower RP values and higher soil moisture. From the depth of 0,20 m both systems presented indicative of compacted layers of the soil.