Fontes, doses e modo de aplicação de nitrogênio em feijoeiro no sistema plantio direto
Data
2009-01-01
Autores
Binotti, Flávio Ferreira da Silva [UNESP]
Arf, Orivaldo [UNESP]
Sá, Marco Eustáquio de [UNESP]
Buzetti, Salatier [UNESP]
Alvarez, Angela Cristina Camarim [UNESP]
Kamimura, Karina Marie [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Instituto Agronômico de Campinas
Resumo
O manejo do N correspondente à maior produtividade de grãos, do ponto de vista econômico, muitas vezes não é o mais rentável e, portanto, não será adequado para recomendação ao produtor. O objetivo do trabalho foi o de estudar o efeito de fontes, doses e parcelamento do nitrogênio no desenvolvimento e na produtividade de grãos do feijoeiro de inverno no sistema plantio direto, correlacionado com análise econômica simples, em Latossolo Vermelho Distrófico argiloso, em Selvíria (MS), em 2005. O delineamento experimental foi o de blocos casualizados em esquema fatorial 3 x 5 x 2, com trinta tratamentos e quatro repetições, constituídos por três fontes de nitrogênio (uréia, sulfato de amônio - SA e mistura - ½ N uréia + ½ N SA), cinco doses de N (0, 50, 100, 150 e 200 kg ha-1), aplicadas na semeadura ou parceladamente. Com o N proveniente do sulfato de amônio proporcionou-se mais produtividade de grãos e, com a uréia, maior eficiência econômica. A produtividade foi incrementada com o aumento da adubação nitrogenada até a dose de 198 kg ha-1, proporcionando-se, em média, aumento de 44% na produtividade comparada à da testemunha sem N. O parcelamento da adubação nitrogenada não foi economicamente viável.
Several works show the efficiency of the nitrogen fertilization in the yield increase common bean yield; however, there is need of new studies, because of the economical point of view, the management of nitrogen that corresponds the largest yield of grains many times it does not correspond to the most profitable and, therefore, it does not fit for recommendation to the producer. The objective of the work was to study the effect of sources, doses and nitrogen split in the development and yield of winter common bean in no tillage system, correlated with a simple economical analysis. The trial was conducted in Selvíria county, Mato Grosso do Sul, State, in 2005, in a dystrophic clayey Latosol - Haplustox. A randomized blocks design was used, in a factorial scheme 3x5x2 with 30 treatments and 4 repetitions constituted by three sources of nitrogen (ammonium sulphate, urea and ammonium sulphate ½ of N + urea ½ of N), with different doses of nitrogen (0, 50, 100, 150 e 200 kg ha-1) applied at sowing or split (1/3 at sowing + 2/3 V4-4 growth stage). The source of nitrogen from ammonium sulphate provides larger yield of grains of the winter common bean; however, the urea is that provides larger economical efficiency. The increase of the nitrogen fertilization increases the yield up to 198 kg/ha of N, providing on average an increase of 44% in the yield compared with the control (without N). The nitrogen split was not economically viable.
Several works show the efficiency of the nitrogen fertilization in the yield increase common bean yield; however, there is need of new studies, because of the economical point of view, the management of nitrogen that corresponds the largest yield of grains many times it does not correspond to the most profitable and, therefore, it does not fit for recommendation to the producer. The objective of the work was to study the effect of sources, doses and nitrogen split in the development and yield of winter common bean in no tillage system, correlated with a simple economical analysis. The trial was conducted in Selvíria county, Mato Grosso do Sul, State, in 2005, in a dystrophic clayey Latosol - Haplustox. A randomized blocks design was used, in a factorial scheme 3x5x2 with 30 treatments and 4 repetitions constituted by three sources of nitrogen (ammonium sulphate, urea and ammonium sulphate ½ of N + urea ½ of N), with different doses of nitrogen (0, 50, 100, 150 e 200 kg ha-1) applied at sowing or split (1/3 at sowing + 2/3 V4-4 growth stage). The source of nitrogen from ammonium sulphate provides larger yield of grains of the winter common bean; however, the urea is that provides larger economical efficiency. The increase of the nitrogen fertilization increases the yield up to 198 kg/ha of N, providing on average an increase of 44% in the yield compared with the control (without N). The nitrogen split was not economically viable.
Descrição
Palavras-chave
Phaseolus vulgaris L., manejo do nitrogênio, sulfato de amônio, uréia, modo de aplicação, viabilidade econômica, Phaseolus vulgaris L., nitrogen management, ammonium sulphate, urea, application way and economical viability
Como citar
Bragantia. Instituto Agronômico de Campinas, v. 68, n. 2, p. 473-481, 2009.