Produtividade da cana-de-açúcar relacionada à localização de adubos nitrogenados aplicados sobre os resíduos culturais em canavial sem queima

Vitti, André César; Trivelin, Paulo César Ocheuze; Gava, Glauber José de Castro; Franco, Henrique Coutinho Junqueira; Bologna, Isabela Rodrigues; Faroni, Carlos Eduardo

doi:10.1590/s0100-06832007000300009

Cited by 48 publications

(48 citation statements)

References 14 publications

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“…The NO 3 -is reduced, incorporated into the soil biomass or absorbed by plants (Cantarella, 2007). It is worth noting that in the transformation chain of nitrogen in tropical soil, both N sources resulted in the formation of only negligible amounts of ammonia, contrary to when urea was applied (Vitti et al, 2005;Lara Cabezas & Souza, 2008).…”

Section: Resultsmentioning

confidence: 97%

Ammonia volatilization from coated urea forms

Nascimento¹,

Vitti

Faria³

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYNitrogen fertilization is a major component of the cost of agricultural production, due to the high cost and low efficiency of fertilizers. In the case of urea, the low efficiency is mainly due to losses by volatilization, which are more pronounced in cultivation systems in which plant residues are left on the soil. The objective of this work was to compare the influence of urea coated with sulfur or boric acid and copper sulfate with conventional N fertilizers on N volatilization losses in sugar cane harvested after stubble burning. The sources urea, sulfurcoated urea, urea coated with boric acid and copper sulfate, as well as nitrate and ammonium sulfate, were tested at amounts containing N rates of 120 kg ha -1 N. The integration of new technologies in urea fertilization can reduce N losses by volatilization. These losses were most reduced when using nitrate and ammonium sulfate. The application of a readily acidified substance (boric acid) to urea was more efficient in reducing volatilization losses and nutrient removal by sugar cane than that of a substance with gradual acidification (elemental sulfur).

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Section: Resultsmentioning

confidence: 97%

Ammonia volatilization from coated urea forms

Nascimento¹,

Vitti

Faria³

et al. 2013

Rev. Bras. Ciênc. Solo

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“…Alternatives include adequacy of the application time of N (Da Ros et al, 2005), management of soil moisture (Duarte et al, 2007), a mixture of urea with other fertilizers with acid characteristics, like boric acid, in order to manage the soil chemical characteristics (Vitti et al, 2007), and the use of urea coated with urease inhibitors (Chien et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Urease inhibitor (NBPT) and efficiency of single or split application of urea in wheat crop

et al. 2014

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RESUMOInibidor de urease (NBPT) e a eficiência da ureia aplicada em dose única ou parcelada na cultura do trigo O NBPT (N-(n-butil) tiofosfórico triamida) é uma substância inibidora da urease, que se vem apresentando como das mais promissoras para a maximização do uso do nitrogênio da ureia em sistemas agrícolas. O objetivo deste estudo foi avaliar o desempenho produtivo do trigo irrigado, submetido à fertilização com ureia ou ureia+NBPT aplicadas em dose única ou parcelada. O experimento foi conduzido, de junho a outubro de 2006, em Viçosa-MG, Brasil. Seguiu-se o esquema fatorial 2×2, em que a ureia ou ureia+NBPT foram combinadas com duas formas de aplicação: dose total na semeadura (60kg ha -1 ) ou parcelada (20kg ha -1 na semeadura + 40kg ha -1 , em cobertura, no perfilhamento). O delineamento experimental foi o de blocos ao acaso com dez repetições. Conclui-se que o parcelamento da fertilização nitrogenada não promove incremento de produtividade do trigo, sob as condições de cultivo empregadas; o uso de inibidor de urease aumenta a produtividade da cultura do trigo, quando a ureia é aplicada, em cobertura, durante o perfilhamento, mas, seu uso não promove aumento da produtividade quando a ureia é aplicada no sulco, durante a semeadura. Palavras-chave:Triticum aestivum L., nitrogênio, volatilização de amônia. Received: 20/09/2012; Approved:20/02/2014 Urease inhibitor (NBPT) and efficiency of single or split application of urea in wheat crop 1 NBPT (N-(n-butyl) thiophosphoric triamide), a urease inhibitor, has been reported as one of the most promising compounds to maximize urea nitrogen use in agricultural systems. The objective of this study was to evaluate the performance of irrigated wheat fertilized with urea or urea + NBPT as single or split application. The experiment was conducted from June to October 2006 in Viçosa, MG, Brazil. The experimental design followed a 2×2 factorial scheme, in which urea or urea + NBPT were combined with two modes of application: full dose at sowing (60kg ha -1 ) or split (20kg ha -1 at sowing + 40kg ha -1 as topdressing at tillering), in randomized blocks with ten replications. The split application of nitrogen fertilization does not improve the yield wheat under used conditions. The use of urease inhibitor improves the grain yield of wheat crop when urea is applied in topdressing at tillering, but its use does not promote difference when urea is applied in the furrow at planting.

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“…The relationship carbon/nitrogen (C:N) in trash is approximately 100:1 (Robertson & Thorburn, 2007), and adding this organic material to the soil may cause N immobilization by the microbial biomass (Vitti et al, 2008). Due to the slowness of N mineralization in the trash (Faroni et al, 2003;Vitti et al, 2011), the contribution of this process is not taken into account when managing N fertilizer of sugarcane ratoon (Vitti et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Harvest managements and cultural practices in sugarcane

Castro

Franco

Mutton

2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe presence of trash from the mechanical harvest of green cane on sugarcane plantations promotes changes in the agricultural management, for example, in the mechanical cultural practices of ratoon cane in-between the rows and nitrogen (N) fertilization. The goal of this study was to evaluate the performance of sugarcane in different harvest systems, associated to the mechanical cultural practices in interrows and N rates. The study was carried out on a sugarcane plantation in Sales Oliveira, São Paulo, Brazil, with the sugarcane variety SP81-3250, on soil classified as Acrudox, in a randomized block design with split-split plots and four replications. The main treatments consisted of harvest systems (harvesting green cane or burnt cane), the secondary treatment consisted of the mechanical cultural practices in the interrows and the tertiary treatments were N rates (0, 30, 60, 90, 120 and 160 kg ha -1 ), using ammonium nitrate (33 % N) as N source. The harvest systems did not differ in sugarcane yield (tons of cane per hectare -TCH), but in burnt cane, the pol percent and total sugar recovery (TSR) were higher. This could be explained by the higher quantity of plant impurities in the harvested raw material in the system without burning, which reduces the processing quality. Mechanical cultural practices in the interrows after harvest had no effect on cane yield and sugar quality, indicating that this operation can be omitted in areas with mechanical harvesting. The application of N fertilizer at rates of 88 and 144 kg ha -1 N, respectively, increased stalk height and TCH quadratically to the highest values for these variables. For the sugar yield per hectare (in pol %), N fertilization induced a linear increase.Index terms: nitrogen fertilization, mechanical cultural practices, green cane, Saccharum spp.( A presença da palha no campo, oriunda da colheita mecanizada sem despalha a fogo, implica em mudanças no manejo da cana-de-açúcar, como na realização do cultivo mecânico da soqueira e na fertilização nitrogenada. O objetivo deste trabalho foi avaliar o desenvolvimento da cana-de-açúcar submetida aos diferentes sistemas de colheita, associado à realização ou não do cultivo mecânico, e à aplicação de doses de nitrogênio (N). O trabalho foi desenvolvido na região de Sales Oliveira, SP, em área comercial de cana-de-açúcar, com a variedade SP81-3250 (2º corte), em um Latossolo Vermelho acriférrico. O delineamento foi em blocos casualizados com parcelas subsubdivididas, em quatro repetições, em que os tratamentos principais eram os sistemas de colheita (cana crua ou cana queimada); os tratamentos secundários à realização ou não do cultivo mecânico; e os tratamentos terciários às doses de N (0, 30, 60, 90, 120 e 160 kg ha -1 ), usando como fonte o nitrato de amônio (33 % N). Os sistemas de colheita não diferiram para a produtividade da cana-de-açúcar (t ha -1 de cana -TCH), porém a cana queimada apresentou maior teor de sacarose (Pol) e açúcar total recuperável (ATR), sendo esse fato em razão, provavelmente, ...

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Produtividade da cana-de-açúcar relacionada à localização de adubos nitrogenados aplicados sobre os resíduos culturais em canavial sem queima

Cited by 48 publications

References 14 publications

Ammonia volatilization from coated urea forms

Ammonia volatilization from coated urea forms

Urease inhibitor (NBPT) and efficiency of single or split application of urea in wheat crop

Harvest managements and cultural practices in sugarcane

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