The system of row cleaners isolated or associated to return mechanisms reduces the introduction of straw in the line interior and retains a satisfactory coverage on line. Revista Plantio Direto , v. The MC model consisted of two concave metallic discs, with plane edge Figure 1-C. An adapted seeder Jumil brand Jumil, Batatais, SP was used for the implementation of treatments, with the following configuration: The measuring tape was placed on the sowing line surface in three places, one in the center and the others on two sides of line, 0.
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The cutting disc mechanism consisted of a plane metallic disc, located at front of exeprimente other seeder active devices, and performed straw cutting function, using soil as protection Figure 1-A. ABSTRACT Vegetation cover on soil acts positively in maintaining temperature and soil moisture, yet, it has been imposing specific operational conditions on seeders.
In addition, the soil-water average volumetric content was This increase m index is due to the operational method of covering mechanisms that, when moving, mobilize straw from side to center of sowing line. The objective of this study was to evaluate the performance of different mechanisms in sowing lines concerning straw mobilization, employed in direct seeder. The superiority of results found in this study is associated to the high mass of sorghum straw in experimental conditions that were The treatment containing the row cleaner mechanism efficiently removed straw from the surface of sowing line as well as the return one expermente on straw replacement.
For the sowing operation, a tractor with rated power of The percentages of soil coverage, before and after sowing, were used for the calculation of coverage permanence on soil index CPSwhich expresses the relation of experimnete before and after sowing CORTEZ et al.
The MC model consisted of two concave metallic discs, with plane edge Figure 1-C. The covers M1 model were two plane metallic discs with semicircular indentations, forming a jagged edge, distant from each other and placed in an oblique position in relation to sowing line Figure 1-D. The objective of this study was to evaluate performance of different mechanisms regarding straw mobilization, employed in a no-till seeder.
June 18, ; Accepted: The results of straw incorporation in the line interior Table 3 showed significant effects of the mechanisms. Zea mays; seeder; furrowers. The row cleaner treatment was the most efficient in straw removal on the sowing line surface.
The vegetal coverage percentage straw on the line surface was quantified using a measuring tape of 15 m length, with equidistant markings of 0. Treatment CD, when acting individually, resulted in coverage of sowing line equal to treatments that associated covers to Exoerimente. The measuring tape was placed on the sowing line surface in three places, one in the center and the others on two marecbal of line, 0. However, in clayey soils, the high resistance to penetration of furrow opening components of seeders, associated to soil-water retention, has resulted in problems, such as irregular cut of vegetation, straw accumulation, misplaced line opening, soil adhesion on components, unevenness in sowing depth, inappropriate coverage and compaction of soil on seeds, affecting the uniformity of plant emergence CORTEZ et al.
Straw percentage was obtained directly through the counting of number of points interceded with straw under the measuring tape in center and side of line, with the latter being analyzed through the average value of lateral observations.
The used maize cultivar was AG in the proportion of 8. After the implementation of treatmentsthe mechanisms produced different coverage permanence on soil indexes CPS in the center of sowing line Table 2. In order to characterize the experimental area, undisturbed soil samples were collected using cylindrical rings cm 3 at two depths, 0.
The greatest introduction of straw in the interior of sowing line, observed in treatments with cutting disc at the front, probably contributes for the establishment of air pockets, which prevent an adequate contact soil-seed, affecting germination, according to findings from ARATANI et al.
The covers MC and M1, associated with CD, presented statistically similar performances and both mf superiors to the treatment CD with no associations.
A sowing line of 30 m of length, 3 m apart from each other were the experimental plots.
Coverage mobilization by different no-tillage in-line handling mechanisms
The adoption of covering mechanisms into cutting discs and row cleaners expand coverage of sowing line when compared to mechanisms operating individually.
The covering mechanisms MC, M1 and MS associated with RC, were efficient in the straw return when compared to RC operating individually, showing performances statistically similar to each other, inclusive with treatment CD, the configuration most used commercially Table 2.
Services on Demand Journal. The system of row cleaners isolated or associated to return mechanisms reduces the introduction of straw in the line interior and retains a satisfactory coverage on line.
The experimental area was conducted on clayey soil under no-tillage with a large quantity of sorghum residue.
Therefore, these must be always mv with relocation mechanisms of straw on sowing line so the production system benefits from the advantages of adequate seed positioning inside sowing line, maintenance of water and soil temperature, concluded by ARATANI et al. We assessed the coverage permanence on soil index, vegetation mass on surface and inside the line.
When investigating anterior and posterior mechanism association, it is verified that none of the covering mechanisms was vd to restore the same amount of straw taken off by RC, needing to be improved. The soil was classified as Dystroferric Red Latosol and was on no-tillage system for 21 years. Desempenho de uma semeadora direta equipada com diferentes mecanismos para o manejo da palha na linha.