Perda de nitrogênio pela Brachiaria decumbens após a antese: relação com a umidade do solo

Franco, Henrique Coutinho Junqueira; Damin, Virgínia; Franco, Antonio Carlos; Moraes, Milton Ferreira de

doi:10.1590/s0103-84782008000100016

Cited by 7 publications

(6 citation statements)

References 25 publications

(19 reference statements)

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“…Chun et al (2005) stated that the increase in carbon allocation from shoot to root formation, aiming at increasing surface area, results in a reduced nitrogen content in corn leaves. Franco et al (2008) evaluated leaf nitrogen content of Urochloa decumbens, using two water levels (20 % and 60 % of the soil maximum water retention capacity), and observed an increase of 10.3 % in nitrogen content in the lower water level treatment, when compared to the higher one.…”

Section: Resultsmentioning

confidence: 99%

Effect of irrigation and nitrogen fertilization on agronomic traits of sweet corn1

Souza

Cunha

Magalhães

et al. 2015

Pesqui. Agropecu. Trop.

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Irrigation and nitrogen fertilization are management practices that have positive results for the corn crop. This study aimed at evaluating the effect of nitrogen fertilization and irrigation on agronomic traits of sweet corn. Two experiments were carried out in two crop seasons (winter/spring and summer/autumn), in a split-plot design, with the main plots consisting of four irrigation levels (50 %, 75 %, 100 % and 125 % of the crop evapotranspiration - ETc) and subplots consisting of four nitrogen doses (0 kg ha-1, 100 kg ha-1, 200 kg ha-1and 300 kg ha-1), applied at the V3 and V8 stages, via urea, in a randomized blocks design experiment, with four replications. Leaf nitrogen content, root depth, plant height, stem diameter, ear yield and water use efficiency were evaluated. In the winter/spring season, nitrogen fertilization did not affect yield, while in the summer/autumn season the dose that maximized yield was 300 kg ha-1. Sweet corn showed better results when irrigated with replacements of 50 % and 125 % of ETc, respectively in the summer/autumn and winter/ spring seasons.

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Section: Resultsmentioning

confidence: 99%

Effect of irrigation and nitrogen fertilization on agronomic traits of sweet corn1

Souza

Cunha

Magalhães

et al. 2015

Pesqui. Agropecu. Trop.

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“…Studies indicate that the use efficiency of fertilizer N by sugarcane can vary from 20 to 40 % (Prasertsak et al, 2002;Trivelin et al, 2002b;Franco et al, 2008a;Franco et al, 2011;Vitti et al, 2011). This variation and low exploitation can be related to N loss in the soil-plant system, due to ammonia denitrification and volatilization (Trivelin et al, 2002a), leaching (Oliveira et al, 1999) and N gas loss by the aerial part of plants (Franco et al, 2008c).…”

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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“…Dentre os elementos essenciais às plantas, o nitrogênio é o que passa por inúmeras transformações bioquímicas no solo, podendo ser perdido por vários processos: (i) perda na forma de amônia da própria planta, (ii) transformação química do nitrato e (iii) desnitrificação microbiana (FRANCO et al, 2008). O nitrogênio do solo está, predominantemente, na forma orgânica (95 a 98%) e, portanto, indisponível à absorção pelas plantas.…”

Section: Introductionunclassified

Eficiência da adubação nitrogenada no consórcio entre cafeeiro e Brachiaria brizantha

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Perda de nitrogênio pela Brachiaria decumbens após a antese: relação com a umidade do solo

Abstract: Nitrogen loss through Brachiaria decumbens after anthesis stage: relation with soil moistureRecebido para publicação 16.11.06 Aprovado em 04.04.07

Cited by 7 publications

References 25 publications

Effect of irrigation and nitrogen fertilization on agronomic traits of sweet corn1

Effect of irrigation and nitrogen fertilization on agronomic traits of sweet corn1

Harvest managements and cultural practices in sugarcane

Eficiência da adubação nitrogenada no consórcio entre cafeeiro e Brachiaria brizantha

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