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Soil penetration resistance is an important indicator of soil compaction. Knowing the precise location of layers with increased resistance to penetration can aid in the mechanical management of soil. In this context, the objective of this study was to analyze the soil penetration resistance of a Dystroferric Red Latosol, under no-tillage system with additional compaction due to tractor traffic, using multivariate factor analysis. Compaction states were induced with tractor traffic in a no-tillage area in 0, 2, 4, 6, 8, and 12 passes of an agricultural tractor. The tractor used was the NH 8030 model, with an engine power of 89.79 kW (122 hp). It had diagonal tire wheels with an inflation pressure of 83 kPa on the front tires (14.9-28 R1) and 83 kPa on the rear tires (23.1-30 R1). Additionally, a mass of 7.28 Mg was applied to the soil with each tractor pass. An electronic penetrometer was used to evaluate the soil resistance, with 10 points being taken in each experimental plot. Simultaneously, deformed structure samples were collected to determine soil moisture. Multivariate factor analysis was used as a tool to analyze soil penetration resistance, seeking to determine its stratification up to 0.40 m depth. Factor analysis applied to the study of soil with different tractor traffic intensities allows the identification of layers of growth, transition, reduction, and stabilization of soil resistance to penetration at depth. Soil layers associated with management with furrows in previous crops were identified, as well as compacted surface soil layers induced by tractor traffic compaction, in addition to layers with stabilization at depth, possibly associated with pedogenetic factors. [ABSTRACT FROM AUTHOR]

In a no-tillage system, the absence of soil disturbance combined with increased machine traffic has led to soil compaction in the top layer, negatively affecting its physical quality and hampering crop growth and production. This experiment aimed to assess the impact of tractor traffic, occurring under a no-tillage system, on soil physical properties and their relationship with the growth and yield of white oat crops. The research was conducted in an Oxisol, utilizing a randomized block design with five replications. The treatments consisted of ten consecutive years of no-tillage and additional traffic by 2, 4, 6, and 8 passes of a tractor wheel across the entire plot area. Various soil parameters were evaluated in two soil layers, including soil bulk density, total porosity, macroporosity, and soil resistance to penetration. Additionally, plant height, stem diameter, dry plant mass, mass of one thousand grains, and grain yield were determined. The collected data were analyzed using analysis of variance and linear regression. The results indicated that higher tractor traffic intensity led to increased soil bulk density and reduced macroporosity and soil resistance to penetration in the 0-0.10 m layer compared to the 0.10-0.20 m layer. In the 0-0.10 m layer, bulk density values exceeding 1.44 Mg m-3 were found to restrict the growth and yield of white oat crops, while in the 0.10-0.20 m layer, grain yield was limited when soil bulk density surpassed 1.35 Mg m-3. Our results show that farmers should be aware of the consequences of machine traffic on soil properties as it can have negative effects on crop yields, especially those of white oats grown in clayey soil similar to the one evaluated in this experiment. [ABSTRACT FROM AUTHOR]

Maintaining the amount of sugarcane straw in the soil is essential to enhance the production and longevity of the crop, however, in addition to knowing the appropriate amount, the action of the equipment used for windrowing must be considered, which can influence the stumps of the sugarcane. The objective of this work was to evaluate the growth and productivity of sugarcane submitted to levels of straw on the soil and to the mechanical action windrowing different work speeds, for different harvestig periods. The experimental area was conducted in Dourados, MS, with third-cut ratoon cane, in seasons 1 (variety RB 855156, early cycle), season 2 (variety RB 835486, medium season) and season 3 (variety RB 835054, late season). At each harvest period, the residual straw was windrowing at four working speeds (0 (manual); 7.1; 9.7; 11.6 and 14.2 km h-1) and maintained on the soil four levels of straw (0; 5; 10 and 15 Mg ha-1). Stem height, stem diameter, productivity (TCH) and technological analysis (Brix, sugarcane AR, sugarcane Pol and ATR) were evaluated. As the straw windrowing speed increases, there is an increase in the height and reduction in the diameter of the stem and the TCH of the medium cycle variety RB 835486 (season 2), however it provides an improvement in the technological quality of the sugarcane, maintaining the production of cane stalk sugars per hectare (TAH). It is recommended to use a higher windrowing speed (14,2 km h-1) associated with the partial collection of sugarcane straw corresponding to levels of 5 to 10 Mg ha-1 of straw, without prejudice to the production of cane stalk sugars per hectare. [ABSTRACT FROM AUTHOR]

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Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Global Science & Technology is the property of Global Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Global Science & Technology is the property of Global Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Global Science & Technology is the property of Global Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study aims to evaluate the growth and yield of the sugarcane plant cultivars, and their correlation to soil mechanical penetration resistance in a Dystroferric Red Oxisol submitted to reduced tillage and, no-tillage systems. Eight sugarcane plant cultivars (RB965902, RB985476, RB966928, RB855156, RB975201, RB975242, RB036066 and RB855536) were in each soil preparation system, and the trial was conducted in a completely randomized design and eight treatments and four replications. The trial evaluated: number of tillers per meter, stalks height and diameter, and stalks yield and sugar content. Additionally, were evaluated the soil mechanical penetration resistance (PR) and soil moisture. The highest rates of daily elongation, yield of stalks and sugar content were observed under no - tillage, due to the lower soil mechanical penetration resistance and higher soil moisture. The cultivar RB966928 presented higher values for growth, yield of stalks and sugar content, while RB855536 and the medium to late maturity cultivars RB975201, RB975242, RB036066, which had either a lower stalk growth rate or presented lower number at the end of the cycle in both soil tillage. [ABSTRACT FROM AUTHOR]

Copyright of Engenharia na Agricultura is the property of Engenharia na Agricultura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Scientia Agraria Paranaensis is the property of Revista Scientia Agraria Paranaensis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)