Abstract
ABSTRACT Poultry manure and mechanical management may influence the distribution of nutrients in the soil profile. The objective was to evaluate physical and chemical changes in a soil with palisade grass ( Brachiaria brizantha cv. Marandu) fertilized with doses of poultry manure with and without use of soil chiseling, after 180 days of application. The design was a randomized blocks with four replicates, in a 5 x 2 factorial arrangement with five doses of manure (0, 1.073, 2.074, 4.148 and 6.222 Mg ha-1), with and without soil chiseling at 0.20 m. Soil chiseling caused physical changes with an increase of macroporosity in the layer of 0-0.2 m and reduction in soil density and increase in macroporosity and total porosity in the layer of 0.2-0.4 m. With manure doses, pH in the layer of 0-0.1 m showed quadratic fit with maximum value of 7.2. The increases in Ca and Zn in the layer of 0-0.1 m were, respectively, 0.61 cmolc dm-3 and 2.99 mg dm-3. In the interaction of Dose x Management, without soil chiseling, K showed a linear fit and increased 1.39 times; while in the interaction of Dose x Management, with soil chiseling in the layers of 0.1-0.2 and 0.2-0.4 m, P increased by 8.10 and 3.95 mg dm-3, respectively. In the contrast between the dose zero and manure dose, there was significance for pH, Ca, P and Zn in the layer of 0-0.1 m.
Highlights
As in all the regions of the country, in Northeastern Paraná, the low yield of a planted pasture is characterized by the removal of nutrients from the soil through the requirements of forages and animals (Macedo et al, 2000), soil erosion and nutrient leaching (Inácio et al, 2007), lack of organic matter (Lima et al, 2007) and lack of care with Brachiaria grass in areas of low fertility (Martha Júnior & Vilela, 2002)
This study aimed to evaluate physical and chemical alterations in a soil under palisade grass
Macroporosity, microporosity, total porosity, in the layers of 0.0-0.2 and 0.2-0.4 m, and hydraulic conductivity on soil surface were not influenced by the increase in poultry manure doses
Summary
As in all the regions of the country, in Northeastern Paraná, the low yield of a planted pasture is characterized by the removal of nutrients from the soil through the requirements of forages and animals (Macedo et al, 2000), soil erosion and nutrient leaching (Inácio et al, 2007), lack of organic matter (Lima et al, 2007) and lack of care with Brachiaria grass in areas of low fertility (Martha Júnior & Vilela, 2002). In area with recovered pasture, Moreira et al (2005) observed higher values of pH, Ca+2, Mg+2, P, K+, Zn, organic matter, macroporosity and total porosity, and lower values of soil density and resistance to penetration
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