Abstract
ABSTRACT Evaluation of mobilized soil profiles can provide important information on soil compaction reduction processes. In this context, the objective of this study was to evaluate alterations in soil penetration resistance and the impact on the aggregate stability of a cohesive Ultisol cultivated with sugarcane. The experiment was carried out at the Carpina Sugarcane Experimental Station (EECAC/UFRPE), located in the city of Carpina, PE. Penetration resistance, mobilized area and depth, and percentage of soil aggregates were evaluated before and after soil tillage. Soil mobilization improved soil aggregate uniformity and decreased penetration resistance in the 0-0.20 m layer. Coarse soil fraction, moisture and organic carbon positively contributed to the increase in soil mobilization.
Highlights
Brazil is the largest sugarcane producer in the world, which has placed the country as the largest sugar producer and exporter (FAO, 2016) and second largest ethanol producer (Marin & Nassif, 2013)
The objective of the present study was to evaluate alterations in penetration resistance and aggregate stability due to tillage system in a dystrocohesive Ultisol cultivated with sugarcane
The observed mean weight diameter (MWD) is higher than that found by Vicente et al (2012) in both layers, but similar to that found by Hickmann et al (2011) in areas with lower soil mobilization
Summary
Brazil is the largest sugarcane producer in the world, which has placed the country as the largest sugar producer and exporter (FAO, 2016) and second largest ethanol producer (Marin & Nassif, 2013). Kumar et al (2012) observed improvement in sugarcane yield with subsoiling of two soils in India and found that tillage was beneficial to reduce compaction and have lower costs, compared with other practices. Hasan (2012) found increment in penetration resistance, due to traffic, of 100, 51 and 15% at depths of 10, 20 and 30 cm, respectively, and indicated moldboard plow as the most efficient implement to reduce penetration resistance in the studied soil. This author associated the passing of tractor to the increment in resistance to penetration and reduction in plant growth and yield
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