Volatilização de amônia da ureia alterada por sistemas de preparo de solo e plantas de cobertura invernais no Centro-Sul do Paraná

Rojas, Carlos Andrés Leguizamón; Bayer, Cimélio; Fontoura, Sandra Mara Vieira; Weber, Mirla Andrade; Vieiro, Fernando

doi:10.1590/s0100-06832012000100027

Cited by 34 publications

(33 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Urea has the lowest cost compared to other N sources and is easily available in the market, but has low use efficiency by crops and high rate of volatilization (Rojas et al 2012). However, Souza et al (2011) reported response in corn yield independent of the application mode, before sowing or topdressing with the sources ammonium sulfonitrate with nitrification inhibitor, ammonium sulfate or urea.…”

Section: Introductionmentioning

confidence: 99%

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

et al. 2014

View full text Add to dashboard Cite

RESUMOEspaçamento, densidade populacional e adubação nitrogenada na cultura do milho O objetivo deste trabalho foi avaliar os componentes de produção, teor de nitrogênio (N) no tecido foliar e produtividade de grãos na cultura do milho em função de diferentes espaçamentos entre linhas, densidade populacional e doses de adubação nitrogenada em cobertura. O experimento foi conduzido no município de Toledo-PR, no ano agrícola de 2005/2006, em área de Latossolo Vermelho Eutroférrico sob sistema de semeadura direta, com o híbrido simples AG 8021. O delineamento experimental utilizado foi em blocos casualizados, com quatro repetições e tratamentos dispostos em parcelas subsubdivididas. Nas parcelas foram alocados os espaçamentos entre linhas (0,45 e 0,90 m), nas subparcelas foram alocadas as populações de plantas de milho (60 mil e 80 mil plantas ha -1 ) e nas subsubparcelas foram alocadas as doses de nitrogênio em cobertura (80, 100, 120 e 140 kg ha -1 de N), utilizando-se como fonte de nitrogênio a ureia. A elevação da população de plantas de 60 mil para 80 mil plantas ha -1 , assim como a aplicação de doses crescentes da adubação nitrogenada em cobertura proporcionaram incremento nos componentes de produção. A aplicação de N em cobertura proporciona incremento no teor de N foliar e na produtividade de grãos para o espaçamento 0,45 m e 0,90 m. O espaçamento de 0,45 m alcançou produtividade superior ao espaçamento 0,90 m. Com 60 mil plantas a produtividade foi maior do que com 80 mil plantas no espaçamento de 0,90 m, enquanto que com 0,45 m não houve diferença quanto à densidade populacional.Palavras-chave: arranjo de plantas, Zea mays L., ureia, nitrogênio em cobertura. Spacing, population density and nitrogen fertilization in corn grown in an OxisoilThe objective of this study was to evaluate yield components, leaf nitrogen content and grain yield in corn as affected by row spacing, plant density and nitrogen topdressing. The experiment was conducted with the singlecross hybrid AG 8021, in the municipality of Toledo-PR, in an Oxisoil under no-tillage system, in the crop year 2005/ 2006. The experiment was arranged in a randomized block design and treatments in split-split-plots, with four replications. The two row spacings (0.45 and 0.90 m) were allocated in the main plots, the two plant densities (60,000 and 80,000 plants ha -1 ) were allocated in the subplots and the three nitrogen rates (80, 100, 120 and 140 kg ha -1 N) were allocated in the sub-subplots. Topdress nitrogen was applied using urea as N source. The rise of the plant population from 60,000 to 80,000 plants ha -1 and the application of topdress nitrogen resulted in increased production components. The application of topdress fertilization provided increase in leaf N content and grain yield for the spacings 0.45 m and 0.90 m. Yield was higher in the spacing 0.45 m than 0.90 m. Yield was higher with 60,000 plants than with 80,000 plants at 0.90 m, while at 0.45 m there was no difference in relation to the plant density.

show abstract

Section: Introductionmentioning

confidence: 99%

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

et al. 2014

View full text Add to dashboard Cite

show abstract

“…According to Rojas et al (2012) greater daily N losses result from volatilization in no-till fields with various cover crop species within the first five days after urea application and are highly influenced by rainfall during that period.…”

Section: Nitrogen Loss By Ammonia Volatilizationmentioning

confidence: 99%

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

et al. 2016

View full text Add to dashboard Cite

High nitrogen losses by ammonia volatilization are expected when urea is used as the source of N. The use of controlled-release urea and urease inhibitors are possible strategies to reduce such losses and increase nitrogen use efficiency. This study aimed to evaluate nitrogen losses by ammonia volatilization from stabilized, slow and controlled release urea and its absorption by maize grown under no-till in an improved Cerrado soil. Four N sources were used: conventional urea, urea + N-(n-butyl) thiophosphoric triamide (NBPT), urea + Cu and B and urea coated by sulfur + polymers. These N sources were surface applied along the rows using three N doses of 100, 150 and 200 kg ha -1 . No N was added to the control. Data were collected regarding N losses by volatilization, the N contents accumulated in the stubble and grains, and the yields of the stubble and grains. Stabilized urea and slow release urea were efficient for postponing the ammonia volatilization peaks. The urease inhibitors postponed the peaks for up to two days, reducing the accumulated volatilization by 18% when compared with common urea. Polymer sulfur coated urea resulted in a 37% reduction in ammonia volatilization. Increasing the N application rate to 200 kg ha -1 resulted in 16% greater yields and 37% greater N accumulation in the plants relative to the control. However, the stabilized and slow-release urea did not improve the N accumulation or yield. Consequently, the nitrogen use efficiency of maize was not improved relative to the use of conventional urea.Index terms: Nitrogen fertilizers; NH 3 -N losses; polymer sulfur coated urea; urease inhibitors; Zea mays L. RESUMOA aplicação de ureia, frequentemente, gera grandes perdas de N por volatilização e o uso de revestimentos e inibidores de urease, podem reduzir essas perdas. Neste estudo, objetivou-se avaliar as perdas de nitrogênio pela ureia estabilizada e de liberação lenta ou controlada e sua absorção pelo milho cultivado em plantio direto, em solo de Cerrado, com fertilidade construída. Quatro fontes de N foram utilizadas: ureia convencional, ureia + N-(n-butyl)thiophosphoric triamide (NBPT), ureia + Cu + B e ureia revestida por enxofre e polímeros. Essas fontes de N foram aplicadas em superfície nas doses de 100, 150 e 200 kg ha -1 . Não houve aplicação de N no controle. Avaliaram-se as perdas de N por volatilização, o acúmulo de N nos grãos e palhada e produção de grãos e de palhada. A ureia estabilizada e de liberação controlada foi eficiente em atrasar os picos de volatilização de amônia. Os inibidores de urease atrasaram os picos de volatilização em até dois dias, reduzindo a volatilização acumulada em até 18%, quando comparado à ureia comum. A ureia revestida por enxofre e polímeros resultou em uma redução de 37% na volatilização de amônia. O aumento da dose de N até 200 kg ha -1 resultou em aumento de 16% na produtividade e 37% no acúmulo de N em relação ao controle. Entretanto, a ureia estabilizada e de liberação controlada não aumentou o acúmulo de N ou a produtividade...

show abstract

“…Nitrogen (N) is essential to guarantee high yield of the wheat crop (Teixeira Filho et al, 2010;Prando et al, 2013), but is easily leached in rainy years (Teixeira Filho et al, 2010;Mantai et al, 2015) or volatilized in dry years (Rojas et al, 2012;Arenhardt et al, 2015). Thus, N use efficiency by wheat is eventually compromised, decreasing the yield and increasing the losses to the environment (Prando et al, 2013.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen efficiency in wheat yield through the biopolymer hydrogel

Mamann

Silva

Scremin

et al. 2017

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

A B S T R A C TNitrogen use efficiency in wheat biomass and grain yields can be favored by the biopolymer hydrogel. The objective of the study was to analyze the use of the biopolymer hydrogel applied to the seed in the optimization of fertilizer-N on wheat biomass and grain yields, under different conditions of agricultural year and succession systems of high and reduced release of residual-N. In the study, two experiments were conducted, with different farming systems, soybean/wheat and maize/wheat, one to quantify the biomass yield rate and the other to determine grain yield. The experiments were conducted in the years 2014 and 2015, in a randomized block design with four replicates in a 4 x 4 factorial scheme, corresponding to hydrogel doses (0, 30, 60 and 120 kg ha ), applied as top-dressing. It is possible to improve the fertilizer-N efficiency by wheat using the biopolymer hydrogel for the production of biomass and grains. The highest wheat yield per kilogram of N supplied is obtained with 30 and 60 kg ha -1 of hydrogel, regardless of the year and succession system.Eficiência do nitrogênio na produtividade do trigo pelo biopolímero hidrogel ) aplicadas em cobertura, respectivamente, no sistema de sucessão soja/trigo e milho/trigo. É possível melhorar a eficiência de N-fertilizante pelo trigo com o uso do biopolímero hidrogel à produção de biomassa e grãos. A maior produtividade de trigo por quilograma de nitrogênio fornecido é obtida com 30 e 60 kg ha -1 de hidrogel, independente do ano e do sistema de sucessão. R E S U M O IntroductionWheat is one of the most produced cereals in the world (Arenhardt et al., 2015;Brezolin et al., 2017). Nitrogen (N) is essential to guarantee high yield of the wheat crop (Teixeira Filho et al., 2010;Prando et al., 2013), but is easily leached in rainy years (Teixeira Filho et al., 2010; Mantai et al., 2015) or volatilized in dry years (Rojas et al., 2012;Arenhardt et al., 2015). Thus, N use efficiency by wheat is eventually compromised, decreasing the yield and increasing the losses to the environment (Prando et al., 2013. Technologies that allow to improve yield with greater sustainability are necessary, especially in the increase of N use efficiency in the agricultural processes (Pinnow et al., 2013; Mantai et al., 2015).One of the ways to improve N absorption by plants is the maintenance of soil moisture, since the N supply depends, among other factors, on moisture, aeration and temperature, which interact in the cultivation systems (Rocha et al., 2008;Silva et al., 2015). The use of the biopolymer hydrogel may represent a technology to regulate soil water availability to crops, which would favor the efficiency of absorption of nutrients and improve the yield (Azevedo et al., 2008;Mendonça et al., 2013). Hydrogels are biodegradable threedimensional polymeric networks that retain water in their structure, forming a gel, which is capable of hydrating and releasing water over time (Kaewpirom & Boonsang, 2006;Venturoli & Venturoli, 2011).The objective of the study was t...

show abstract

Volatilização de amônia da ureia alterada por sistemas de preparo de solo e plantas de cobertura invernais no Centro-Sul do Paraná

Cited by 34 publications

References 18 publications

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

Spacing, population density and nitrogen fertilization in corn grown in an Oxisoil

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

Nitrogen efficiency in wheat yield through the biopolymer hydrogel

Contact Info

Product

Resources

About