Data/hora: 22/06/2024 03:45:54

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 17/01/2020
Data da última atualização: | 13/02/2020
Autoria: | SANTOS, A. B. dos; SILVA, M. A. S. da; SILVEIRA, P. M. da; CARVALHO, G. D.; STONE, L. F.
Afiliação: | ALBERTO BAETA DOS SANTOS, CNPAF; MELLISSA ANANIAS SOLER DA SILVA, CNPAF; PEDRO MARQUES DA SILVEIRA, CNPAF; GLAUCILENE DUARTE CARVALHO, SECIMA, Goiânia-GO; LUIS FERNANDO STONE, CNPAF.
Título: | Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice.
Ano de publicação: | 2019
Fonte/Imprenta: | Revista Ceres, v. 66, n. 6, p. 422-430, nov./dez. 2019.
ISSN: | 2177-3491
DOI: | 10.1590/0034-737X201966060003
Idioma: | Inglês
Conteúdo: | The proper nitrogen management is required to achieve high irrigated rice yield. This study aimed to determine the rice response to nitrogen topdressing doses and calibrate the chlorophyll meter reading. Three experiments were conducted in a randomized block design. In the first experiment, five N rates (0, 30, 60, 90, and 120 kg ha-1) were evaluated as the first, and 30 kg ha-1 N as the second topdressing, which were combined with the application of 30 kg ha-1 N as the first and five N rates, as the second topdressing. The other experiments assessed the application of 30 kg ha-1 of N, as the first, and four N rates (0, 40, 80, and 120 kg ha-1), as the second topdressing. There was a response to N application, with maximum technical efficiency reaching 33 kg ha-1 in the first and between 40 and 50 kg ha-1 in the second topdressing. The chlorophyll meter was sensitive to estimate the amount of N to be applied in topdressing, using the nitrogen sufficiency index (NSI). To each percent unit of NSI below 95%, one should apply 10 kg ha-1 of N as the first and 2-3 kg ha-1 of N as the second topdressing.
Palavras-Chave: | Nitrogen topdressing.
Thesagro: | Arroz Irrigado; Clorofila; Fertilizante Nitrogenado; Nitrogênio; Oryza Sativa.
Thesaurus Nal: | Chlorophyll; Grain yield; Irrigation management; Nitrogen fertilizers; Rice.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/209003/1/CNPAF-2019-rc.pdf
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (35711-1) - UPC - AP - DD - 2019 -  - 2019 - DIS