Potássio no desenvolvimento inicial da soqueira de cana crua

Flores, Rilner Alves; Prado, Renato de Mello; Politi, Lucas Sanches; Almeida, Thiago Batista Firmato de

doi:10.1590/s1983-40632012000100015

Cited by 15 publications

(18 citation statements)

References 7 publications

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“…But at the second ratoon, the application of K fertilizer caused increments with linear adjustment in soil K content at depths 20-40 cm, reaching 0.07 cmolc kg -1 with the highest nutrient rate (Figure 2b). Results are similar to those reported by Silva (2010) and Flores et al (2012).…”

Section: Resultssupporting

confidence: 93%

Potassium nutrition in the first and second ratoon sugarcane grown in an Oxisol by a conservationist system

Flores

Prado

Pancelli

et al. 2014

Chilean J. Agric. Res.

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The presence of mulch on the soil surface after the mechanical harvesting of sugarcane (Saccharum officinarum L.) enhances the cycling of nutrients, especially K, which can decrease K fertilizer recommendations for the crop. The aim of this study was to evaluate the effect of K addition to an Oxisol, with an initial concentration 0.07 cmolc K kg -1 , in first and second ratoon (no-till) sugarcane cultures by a conservationist system, i.e. rational use of fertilizers, use of alternative inputs and especially the maintenance of residues in soil that was previously burned to facilitate cutting. The following K doses were tested: 0, 32.5, 65, 130, and 195 kg K2O ha -1 , arranged in a randomized block design with five replicates. Potassium content in the soil and in the plant, as well as the yield and the quality of stalks were evaluated. Soil K application increased K concentration in soil and plant, and was reflected in the production of stalks, with higher production (87.5 and 107.5 t ha -1 ) with the use of 120 and 123 kg K2O ha -1 in first and second ratoon sugarcane, respectively. At the first 2 yr it was not possible to reduce the K fertilization in ratoon. Therefore, with the introduction of the conservationist system there was an increase (20 t ha -1 ) at the second ratoon regarding the first one with the same applied rate.

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Section: Resultssupporting

confidence: 93%

Potassium nutrition in the first and second ratoon sugarcane grown in an Oxisol by a conservationist system

Flores

Prado

Pancelli

et al. 2014

Chilean J. Agric. Res.

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“…The significantly different K + concentrations denote their proportional response to K 2 O application, mainly considering the K + increases in the soil solution between 105 and 122 DAP (sprouting and establishment stages). Flores et al (2012) evaluated the K + distribution in soils under sugarcane crops and found similar results, with K 2 O applications affecting the K + concentration in the soil solution of the surface layer the K + concentration in the soil solution increased in the 0.0-0.2 m layer as the K 2 O rates were increased.…”

Section: Source Of Variationmentioning

confidence: 69%

“…Based on studies about soil fertilization for sugarcane crops (ANDRADE JÚNIOR et al, 2010;COELHO et al, 2014;FLORES et al, 2012;JORIS, 2015), five treatments were established, composed of N (urea) + K 2 O (potassium chloride) at rates of 60+120 (T1); 180+120 (T2); 120+60 (T3); 120+180 (T4), and 120+120 (T5) kg ha -1 .…”

Section: Methodsmentioning

confidence: 99%

Nitrate and Potassium Dynamics in Profiles of Soils Cultivated With Fertigated Sugarcane Crops

et al. 2019

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The objective of this study was to evaluate the distribution of NO3 - and K+ in the profile of soils cultivated with sugarcane crops, after application of different nitrogen (N) and potassium (K2O) rates via subsurface drip fertigation, in Teresina, PI, Brazil. The experiment was conducted at the experimental area of Embrapa Meio-Norte, using a randomized block design with four replications. The treatments were arranged in split plots, with N+K2O rates (60+120, 180+120, 120+60, 120+180, and 120+120 kg ha-1 of N + K2O, respectively) in the plots, and soil layers (0.0-0.2, 0.2-0.4, and 0.4-0.6 m), for quantification of NO3- and K+ concentrations in the soil, in the subplots. The soil of the experimental area was a Typic Hapludult of sandy-loam texture. The distribution of nitrate (NO3-) and potassium (K+) in the soil layers after the N+K2O applications were evaluated. The NO3- and K+ concentrations in soils under sugarcane crops in the plant crop cycle is higher at the beginning and at the end of the cycle, respectively. The NO3 - and K+ concentrations in the soil solution are dependent on the evaluation time, soil layer, and N and K2O rates applied via fertigation. The highest concentrations of NO3- (264 mg L-1) and K+ (377 ppm) were found in the 0.0-0.2 m soil layer. No leaching of NO3- or K+ to deepest soil layers (>0.4 m) was found.

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“…The K leaching is significant in sandy soils, which are characterized by having low effective CEC and low water retention capacity (Ernani et al, 2007). Furthermore, high rainfall rates may enable the displacement of K in the soil profile, reducing the levels of this nutrient in the surface layers, even in more clayey soils and with high CEC (Flores et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Impacts of vinasse and methods of sugarcane harvesting on the availability of K and carbon stock of an Argisol

2016

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RESUMOImpacts of vinasse and methods of sugarcane harvesting on the availability of K and carbon stock of an Argisol Soils of tropical regions are more weathered and in need of conservation managements to maintain and improve the quality of its components. The objective of this study was to evaluate the availability of K, the organic matter content and the stock of total carbon of an Argisol after vinasse application and manual and mechanized harvesting of burnt and raw sugarcane, in western São Paulo. The data collection was done in the 2012/2013 harvest, in a bioenergy company in Presidente Prudente/SP. The research was arranged following a split-plot scheme in a 5x5 factorial design, characterized by four management systems: without vinasse application and harvest without burning; with vinasse application and harvest without burning; with vinasse application and harvest after burning; without vinasse application and harvest with burning; plus native forest, and five soil sampling depths (0-10 10-20, 20-30, 30-40, 40-50 cm), with four replications. In each treatment, the K content in the soil and accumulated in the remaining dry biomass in the area, the levels of organic matter, organic carbon and soil carbon stock were determined. The mean values were compared by Tukey test. The vinasse application associated with the harvest without burning increased the K content in soil layers up to 40 cm deep. The managements without vinasse application and manual harvest after burning, and without vinasse application with mechanical harvesting without burning did not increase the levels of organic matter, organic carbon and stock of total soil organic carbon, while the vinasse application and harvest after burning and without burning increased the levels of these attributes in the depth of 0-10 cm.Key words: soil fertility, organic matter, straw, leaching. Impactos da vinhaça e formas de colheita da cana-de-açúcar na disponibilidade de K e no estoque de carbono de um ArgissoloSolos de regiões tropicais são mais intemperizados e necessitam de manejos conservacionistas para manter e melhorar a qualidade dos seus componentes. O objetivo desta pesquisa foi avaliar a disponibilidade de K, o teor de matéria orgânica e o estoque de carbono total de um Argissolo, diante da aplicação de vinhaça e da colheita manual e mecanizada de cana, queimada e crua, no oeste paulista. A coleta de dados ocorreu na safra 2012/2013, em uma empresa de bioenergia de Presidente Prudente, SP. Utilizou-se o delineamento em parcelas subdivididas, em esquema fatorial 5x5, caracterizado pelos manejos (sem aplicação de vinhaça e com colheita sem queima; com aplicação de vinhaça e com colheita sem queima; com aplicação de vinhaça e colheita com queima; sem aplicação de vinhaça e colheita com queima; mata nativa), cinco profundidades de amostragem de solo (0-10, 10-20, 20-30, 30-40, 40-50 cm), em quatro repetições. Nas amostras foram determinados o teor de K do solo e o acumulado na biomassa seca remanescente na 96 Claudinei Alberto Cardin et al.

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Potássio no desenvolvimento inicial da soqueira de cana crua

Cited by 15 publications

References 7 publications

Potassium nutrition in the first and second ratoon sugarcane grown in an Oxisol by a conservationist system

Potassium nutrition in the first and second ratoon sugarcane grown in an Oxisol by a conservationist system

Nitrate and Potassium Dynamics in Profiles of Soils Cultivated With Fertigated Sugarcane Crops

Impacts of vinasse and methods of sugarcane harvesting on the availability of K and carbon stock of an Argisol

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