Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada

Detalhes bibliográficos
Autor(a) principal: Souza Filho, Luiz Francisco da Silva
Data de Publicação: 2010
Tipo de documento: Dissertação
Idioma: por
Título da fonte: LOCUS Repositório Institucional da UFV
Texto Completo: http://locus.ufv.br/handle/123456789/5435
Resumo: In spite of its large quantity found in soil, N is one of the major factors that limit crop production, because the nitrate and anmonium that are preferably absorbable by plants account for less than 2 % of the total N in the soil. For this limitation, it is necessary to use nitrogen fertilization to meet crop requirements emphasizing the urea usage. Despite this, urea demonstrates low agronomic efficiency due to the NH3 loss by volatilization, as the nitrogen fertilization is usually performed on coverage with application on the soil surface. Several alternatives are listed in order to reduce losses. Among them are: the mode of application of urea, the period of fertilization and the production of urea with larger granules. Given the above, this study aimed to evaluate the NH3 loss by volatilization, the absorbed N, and the production by corn plants fertilized with different forms of urea. This work also aimed to evaluate the N loss by ammonia volatilization and the N supply to corn plants by urea in its pearled and granulated form, coated with humic acids synthesized from eucalyptus charcoal. An experiment was installed in a Red-and-Yellow cambic Acrisol, cultivated for several years and which now shows good fertility. We evaluated the PETROBRAS pearled urea (UPP), pearled urea UPI, PETROBRAS granulated urea (UGP), granulated urea UGI and special granulated urea (UTI). The dosages of fertilization on coverage were: 0, 40, 80, 120 and 160 kg ha-1 N. We evaluated the application of topdressing at the growth stage of corn characterized by the second, fourth and sixth fully expanded leaves and also the application of superficial urea (S) and incorporated to 5 cm depth (I), both in line next to the plants. These factors were combined according to an incomplete factorial, a Baconian matrix, resulting in 19 treatments, plus an additional treatment corresponding to the absence of nitrogen fertilization on coverage. Treatments were arranged in a randomized block design with three replications. Data from volatilization of NH3, number and weight seed by ear of corn, yield corn, content and N recovery were by corn plants subjected to analysis of variance with regression fits and comparisons using contrasts. In another experiment we evaluated the pearled (UPP) and granulated (UPG) urea produced by PETROBRAS and the special granulated urea (UTI), uncoated or coated with 200, 120 and 80 g kg-1 of humic acid, respectively, applied onto the soil surface or incorporated to 3 cm depth resulting in a factorial (3 x 2 x 2) + 1, which corresponds to the treatment without topdressing. The experiment was conducted in a greenhouse using corn in pots with 5 dm³ of an Oxisol in a completely randomized design with four replications. The humic acids were synthesized from eucalyptus charcoal obtained with final carbonization temperature of 350 °C. The variables analyzed were: dry matter, amount of absorbed and accumulated N, NH3 volatilization, content of NO3- and NH4+ in the soil. Data were subjected to analysis of variance. The plots fertilized with the UPP showed same losses of NH3 as for plots fertilized with the other N sources in surface. The plots UGP fertilized plots showed NH3 losses significantly higher than the ones fertilized with UGI. In incorporated application promoted less NH3 volatilization compared with surface application demonstrating the efficiency of fertilizer management practices. UPI promoted higher corn yields than UPP. The UGI, UGP and UTI forms of granulated urea favored an equivalent yield to the obtained with UPP. The yield corn was not altered by the period of the nitrogen fertilization application, indicating that N can be applied when the plant has two open leaves. The yield did not differ between the treatments with incorporated and superficial application of urea. The effects of coating with humic acids for each urea and the effects of the application form for each urea with or without coating were compared using the F test (p <0.05). The mean effects of the forms of urea were compared with the treatment without fertilization of coverage (additional treatment) by means of orthogonal contrasts (p <0.05). The characteristics of humic acids were similar to those found in the literature, indicating that the methodology is feasible for production. The volatilization of NH3 and dry weight of plants were not affected by the use of humic acids as a coating for the forms of urea, however, for N uptake and apparent recovery of N there was a positive effect indicating that the coating of the UPP is advantageous when applied superficially.
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spelling Souza Filho, Luiz Francisco da Silvahttp://lattes.cnpq.br/6184258525451194Silva, Ivo Ribeiro dahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799432D0Novais, Roberto Ferreira dehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783732H4Cantarutti, Reinaldo Bertolahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780430A1Venegas, Victor Hugo Alvarezhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4727865T0Neves, Júlio César Limahttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783076D4Ferreira, Lino Robertohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783318Y22015-03-26T13:53:12Z2011-10-172015-03-26T13:53:12Z2010-02-22SOUZA FILHO, Luiz Francisco da Silva. Ammonia volatilization and nitrogen recovery by maize of pearl, granulated and pads urea. 2010. 83 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2010.http://locus.ufv.br/handle/123456789/5435In spite of its large quantity found in soil, N is one of the major factors that limit crop production, because the nitrate and anmonium that are preferably absorbable by plants account for less than 2 % of the total N in the soil. For this limitation, it is necessary to use nitrogen fertilization to meet crop requirements emphasizing the urea usage. Despite this, urea demonstrates low agronomic efficiency due to the NH3 loss by volatilization, as the nitrogen fertilization is usually performed on coverage with application on the soil surface. Several alternatives are listed in order to reduce losses. Among them are: the mode of application of urea, the period of fertilization and the production of urea with larger granules. Given the above, this study aimed to evaluate the NH3 loss by volatilization, the absorbed N, and the production by corn plants fertilized with different forms of urea. This work also aimed to evaluate the N loss by ammonia volatilization and the N supply to corn plants by urea in its pearled and granulated form, coated with humic acids synthesized from eucalyptus charcoal. An experiment was installed in a Red-and-Yellow cambic Acrisol, cultivated for several years and which now shows good fertility. We evaluated the PETROBRAS pearled urea (UPP), pearled urea UPI, PETROBRAS granulated urea (UGP), granulated urea UGI and special granulated urea (UTI). The dosages of fertilization on coverage were: 0, 40, 80, 120 and 160 kg ha-1 N. We evaluated the application of topdressing at the growth stage of corn characterized by the second, fourth and sixth fully expanded leaves and also the application of superficial urea (S) and incorporated to 5 cm depth (I), both in line next to the plants. These factors were combined according to an incomplete factorial, a Baconian matrix, resulting in 19 treatments, plus an additional treatment corresponding to the absence of nitrogen fertilization on coverage. Treatments were arranged in a randomized block design with three replications. Data from volatilization of NH3, number and weight seed by ear of corn, yield corn, content and N recovery were by corn plants subjected to analysis of variance with regression fits and comparisons using contrasts. In another experiment we evaluated the pearled (UPP) and granulated (UPG) urea produced by PETROBRAS and the special granulated urea (UTI), uncoated or coated with 200, 120 and 80 g kg-1 of humic acid, respectively, applied onto the soil surface or incorporated to 3 cm depth resulting in a factorial (3 x 2 x 2) + 1, which corresponds to the treatment without topdressing. The experiment was conducted in a greenhouse using corn in pots with 5 dm³ of an Oxisol in a completely randomized design with four replications. The humic acids were synthesized from eucalyptus charcoal obtained with final carbonization temperature of 350 °C. The variables analyzed were: dry matter, amount of absorbed and accumulated N, NH3 volatilization, content of NO3- and NH4+ in the soil. Data were subjected to analysis of variance. The plots fertilized with the UPP showed same losses of NH3 as for plots fertilized with the other N sources in surface. The plots UGP fertilized plots showed NH3 losses significantly higher than the ones fertilized with UGI. In incorporated application promoted less NH3 volatilization compared with surface application demonstrating the efficiency of fertilizer management practices. UPI promoted higher corn yields than UPP. The UGI, UGP and UTI forms of granulated urea favored an equivalent yield to the obtained with UPP. The yield corn was not altered by the period of the nitrogen fertilization application, indicating that N can be applied when the plant has two open leaves. The yield did not differ between the treatments with incorporated and superficial application of urea. The effects of coating with humic acids for each urea and the effects of the application form for each urea with or without coating were compared using the F test (p <0.05). The mean effects of the forms of urea were compared with the treatment without fertilization of coverage (additional treatment) by means of orthogonal contrasts (p <0.05). The characteristics of humic acids were similar to those found in the literature, indicating that the methodology is feasible for production. The volatilization of NH3 and dry weight of plants were not affected by the use of humic acids as a coating for the forms of urea, however, for N uptake and apparent recovery of N there was a positive effect indicating that the coating of the UPP is advantageous when applied superficially.O N é um dos nutrientes requerido em maior quantidade pelas plantas e é o que mais limita o seu crescimento. Na maioria dos solos o N é encontrado em quantidades que seria suficiente para atender a demanda das culturas, porém uma grande proporção está em forma orgânica do solo e com elevada recalcitrância. Assim, a adubação nitrogenada se faz necessária e, atualmente, a ureia é o fertilizante mais utilizado. Apesar disto, a eficiência agronômica da ureia é comprometida, considerando que a maior proporção das doses do N é aplicada na adubação de cobertura na superfície do solo. Nestas condições a perda de N pela volatilização de NH3 é intensa. Alternativas de manejo da adubação variando o modo e a época de aplicação da ureia e industriais, como a produção de ureia com diferente granulometria, com ou sem aditivos que controlem a hidrólise da ureia, contribuem para diminuir a volatilização da NH3. Este trabalho objetivou avaliar a volatilização de NH3, o N absorvido, o crescimento e a produção de plantas de milho adubadas com ureia perolada e granulada, revestida, ou não, com ácidos húmicos sintetizados a partir de carvão de eucalipto. Foi realizado um experimento em campo, em um Argissolo Vermelho-Amarelo cambico, cultivado há vários anos e com boa fertilidade atual. Avaliou-se a ureia perolada da PETROBRAS (UPP - 446 g kg-1 de N), a ureia perolada UPI (446 g kg-1 de N); a ureia granulada da PETROBRAS (UGP - 449 g kg-1 de N), a ureia granulada UGI (445 g kg-1 de N) e a ureia granulada especial UTI (451 g kg-1 de N). As doses na adubação de cobertura foram: 0, 40, 80, 120 e 160 kg ha-1 de N. Avaliou-se, ainda, a aplicação da adubação de cobertura quando o milho apresentava duas, quatro e seis folhas expandidas e a aplicação da ureia superficial e incorporada à 5 cm, ambas em linha ao lado das plantas. A combinação destes fatores resultou em 19 tratamentos, de açodo com um fatorial incompleto, denominado matriz Baconiana, acrescido de um tratamento adicional, que correspondeu à ausência de adubação nitrogenada de cobertura. Os tratamentos foram dispostos em um delineamento experimental de blocos ao acaso com três repetições. As parcelas experimentais (4,9 x 10,0 m) foram compostas de sete linhas de milho de 10 m de comprimento, espaçadas de 70 cm. A área útil da parcela (16,8 m2) foi constituída pelas três fileiras centrais, eliminando-se 1 m de cada extremidade. Em parcelas de alguns tratamentos foram instalados coletores de amônia semi-abertos estáticos para quantificar as perdas de amônia aos 3, 7, 12, 19 e 26 d após a adubação de cobertura. No final do ciclo vegetativo do milho quatro plantas foram cortadas rente ao solo e dissecadas em colmo, folha, espiga e pendão. O material vegetal foi seco, pesado e analisado para determinação do teor de N. Ao final do ciclo quantificou-se a produtividade de grãos, o número e peso médio de grãos por espiga. Estimou-se o N absorvido pela população de plantas de milho e a recuperação aparente do N suprido pelas formas de ureia. Em outro experimento em casa de vegetação avaliou-se a UPP, a UGP e a UTI, sem revestimento ou revestidas com 200, 120 e 80 g kg-1, de ácidos húmicos, respectivamente e aplicadas na superfície do solo ou incorporada a 3 cm de profundidade. Assim, os tratamentos resultaram da combinação fatorial (3 x 2 x 2) + 1, que correspondeu ao tratamento sem adubação de cobertura. Os ácidos húmicos foram sintetizados a partir de carvão de eucalipto obtido com temperatura final de carbonização de 350 ºC. O delineamento experimental foi blocos casualisados, com 4 repetições. As unidades experimentais foram vasos com 5 dm3 de um Latossolo Vermelho- Amarelo. Em cada vaso foram instalados coletores de amônia semi-abertos dinâmico. Trinta dias após a adubação de cobertura as plantas foram cortadas rente ao solo. Determinou-se a matéria seca acumulada e o seu teor de N. No experimento em campo constatou-se que a aplicação superficial da UPP e das demais formas de ureia apresentaram quantidade equivalente de NH3 volatilizada. As parcelas fertilizadas com a UGP apresentaram perdas de NH3 significativamente maiores do que aquelas fertilizadas com a UGI. A aplicação incorporada promoveu menor volatilização de NH3 do que a aplicação superficial demonstrando a eficiência desta pratica de manejo da adubação. A UPI promoveu maior produtividade de milho do que a UPP. As formas de ureia granulada UGI, UGP e UTI favoreceram produtividade de milho equivalente a obtida com a UPP. A produtividade do milho não foi alterada pela época de aplicação da adubação nitrogenada, indicando que o N pode ser aplicado quando a planta apresentar duas folhas abertas. A produtividade do milho não diferiu entres os tratamentos com aplicação superficial e incorporada da ureia. O revestimento das ureia perolada (UPP) e granulada (UPI e UTI) com ácidos húmicos não proporcionou menor volatilização de NH3 nem maior acumulo de matéria seca nas plantas de milho. No entanto, para UPP aplicada na superfície do solo o revestimento com ácidos húmicos condicionou maior quantidade de N absorvido e maior recuperação aparente de N pelas plantas de milho.application/pdfporUniversidade Federal de ViçosaMestrado em Solos e Nutrição de PlantasUFVBRFertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,Substâncias húmicasVolatização de amôniaNitrogênioHumic substancesAmmonia volatilizationNitrogenCNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLOVolatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhadaAmmonia volatilization and nitrogen recovery by maize of pearl, granulated and pads ureainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFVORIGINALtexto completo.pdfapplication/pdf350943https://locus.ufv.br//bitstream/123456789/5435/1/texto%20completo.pdf3e5a0839007773fc7b7183796a3f68d1MD51TEXTtexto completo.pdf.txttexto completo.pdf.txtExtracted texttext/plain112182https://locus.ufv.br//bitstream/123456789/5435/2/texto%20completo.pdf.txtfd0670850bd1b513afb11cc291181fb4MD52THUMBNAILtexto completo.pdf.jpgtexto completo.pdf.jpgIM Thumbnailimage/jpeg3582https://locus.ufv.br//bitstream/123456789/5435/3/texto%20completo.pdf.jpgb0e424466adfdfcd5beee6cbec050c5cMD53123456789/54352016-04-11 23:01:53.611oai:locus.ufv.br:123456789/5435Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452016-04-12T02:01:53LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.por.fl_str_mv Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
dc.title.alternative.eng.fl_str_mv Ammonia volatilization and nitrogen recovery by maize of pearl, granulated and pads urea
title Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
spellingShingle Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
Souza Filho, Luiz Francisco da Silva
Substâncias húmicas
Volatização de amônia
Nitrogênio
Humic substances
Ammonia volatilization
Nitrogen
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
title_short Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
title_full Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
title_fullStr Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
title_full_unstemmed Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
title_sort Volatilização de amônia e recuperação de nitrogênio pelo milho da ureia perolada, granulada e pastilhada
author Souza Filho, Luiz Francisco da Silva
author_facet Souza Filho, Luiz Francisco da Silva
author_role author
dc.contributor.authorLattes.por.fl_str_mv http://lattes.cnpq.br/6184258525451194
dc.contributor.author.fl_str_mv Souza Filho, Luiz Francisco da Silva
dc.contributor.advisor-co1.fl_str_mv Silva, Ivo Ribeiro da
dc.contributor.advisor-co1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799432D0
dc.contributor.advisor-co2.fl_str_mv Novais, Roberto Ferreira de
dc.contributor.advisor-co2Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783732H4
dc.contributor.advisor1.fl_str_mv Cantarutti, Reinaldo Bertola
dc.contributor.advisor1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4780430A1
dc.contributor.referee1.fl_str_mv Venegas, Victor Hugo Alvarez
dc.contributor.referee1Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4727865T0
dc.contributor.referee2.fl_str_mv Neves, Júlio César Lima
dc.contributor.referee2Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783076D4
dc.contributor.referee3.fl_str_mv Ferreira, Lino Roberto
dc.contributor.referee3Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783318Y2
contributor_str_mv Silva, Ivo Ribeiro da
Novais, Roberto Ferreira de
Cantarutti, Reinaldo Bertola
Venegas, Victor Hugo Alvarez
Neves, Júlio César Lima
Ferreira, Lino Roberto
dc.subject.por.fl_str_mv Substâncias húmicas
Volatização de amônia
Nitrogênio
topic Substâncias húmicas
Volatização de amônia
Nitrogênio
Humic substances
Ammonia volatilization
Nitrogen
CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
dc.subject.eng.fl_str_mv Humic substances
Ammonia volatilization
Nitrogen
dc.subject.cnpq.fl_str_mv CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
description In spite of its large quantity found in soil, N is one of the major factors that limit crop production, because the nitrate and anmonium that are preferably absorbable by plants account for less than 2 % of the total N in the soil. For this limitation, it is necessary to use nitrogen fertilization to meet crop requirements emphasizing the urea usage. Despite this, urea demonstrates low agronomic efficiency due to the NH3 loss by volatilization, as the nitrogen fertilization is usually performed on coverage with application on the soil surface. Several alternatives are listed in order to reduce losses. Among them are: the mode of application of urea, the period of fertilization and the production of urea with larger granules. Given the above, this study aimed to evaluate the NH3 loss by volatilization, the absorbed N, and the production by corn plants fertilized with different forms of urea. This work also aimed to evaluate the N loss by ammonia volatilization and the N supply to corn plants by urea in its pearled and granulated form, coated with humic acids synthesized from eucalyptus charcoal. An experiment was installed in a Red-and-Yellow cambic Acrisol, cultivated for several years and which now shows good fertility. We evaluated the PETROBRAS pearled urea (UPP), pearled urea UPI, PETROBRAS granulated urea (UGP), granulated urea UGI and special granulated urea (UTI). The dosages of fertilization on coverage were: 0, 40, 80, 120 and 160 kg ha-1 N. We evaluated the application of topdressing at the growth stage of corn characterized by the second, fourth and sixth fully expanded leaves and also the application of superficial urea (S) and incorporated to 5 cm depth (I), both in line next to the plants. These factors were combined according to an incomplete factorial, a Baconian matrix, resulting in 19 treatments, plus an additional treatment corresponding to the absence of nitrogen fertilization on coverage. Treatments were arranged in a randomized block design with three replications. Data from volatilization of NH3, number and weight seed by ear of corn, yield corn, content and N recovery were by corn plants subjected to analysis of variance with regression fits and comparisons using contrasts. In another experiment we evaluated the pearled (UPP) and granulated (UPG) urea produced by PETROBRAS and the special granulated urea (UTI), uncoated or coated with 200, 120 and 80 g kg-1 of humic acid, respectively, applied onto the soil surface or incorporated to 3 cm depth resulting in a factorial (3 x 2 x 2) + 1, which corresponds to the treatment without topdressing. The experiment was conducted in a greenhouse using corn in pots with 5 dm³ of an Oxisol in a completely randomized design with four replications. The humic acids were synthesized from eucalyptus charcoal obtained with final carbonization temperature of 350 °C. The variables analyzed were: dry matter, amount of absorbed and accumulated N, NH3 volatilization, content of NO3- and NH4+ in the soil. Data were subjected to analysis of variance. The plots fertilized with the UPP showed same losses of NH3 as for plots fertilized with the other N sources in surface. The plots UGP fertilized plots showed NH3 losses significantly higher than the ones fertilized with UGI. In incorporated application promoted less NH3 volatilization compared with surface application demonstrating the efficiency of fertilizer management practices. UPI promoted higher corn yields than UPP. The UGI, UGP and UTI forms of granulated urea favored an equivalent yield to the obtained with UPP. The yield corn was not altered by the period of the nitrogen fertilization application, indicating that N can be applied when the plant has two open leaves. The yield did not differ between the treatments with incorporated and superficial application of urea. The effects of coating with humic acids for each urea and the effects of the application form for each urea with or without coating were compared using the F test (p <0.05). The mean effects of the forms of urea were compared with the treatment without fertilization of coverage (additional treatment) by means of orthogonal contrasts (p <0.05). The characteristics of humic acids were similar to those found in the literature, indicating that the methodology is feasible for production. The volatilization of NH3 and dry weight of plants were not affected by the use of humic acids as a coating for the forms of urea, however, for N uptake and apparent recovery of N there was a positive effect indicating that the coating of the UPP is advantageous when applied superficially.
publishDate 2010
dc.date.issued.fl_str_mv 2010-02-22
dc.date.available.fl_str_mv 2011-10-17
2015-03-26T13:53:12Z
dc.date.accessioned.fl_str_mv 2015-03-26T13:53:12Z
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dc.identifier.citation.fl_str_mv SOUZA FILHO, Luiz Francisco da Silva. Ammonia volatilization and nitrogen recovery by maize of pearl, granulated and pads urea. 2010. 83 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2010.
dc.identifier.uri.fl_str_mv http://locus.ufv.br/handle/123456789/5435
identifier_str_mv SOUZA FILHO, Luiz Francisco da Silva. Ammonia volatilization and nitrogen recovery by maize of pearl, granulated and pads urea. 2010. 83 f. Dissertação (Mestrado em Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,) - Universidade Federal de Viçosa, Viçosa, 2010.
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