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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.)

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]