Data/hora: 16/06/2024 01:09:26

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 05/08/2013
Data da última atualização: | 31/10/2013
Autoria: | FAGERIA, N. K.; SANTOS, A. B. dos; OLIVEIRA, J. P. de.
Afiliação: | NAND KUMAR FAGERIA, CNPAF; ALBERTO BAETA DOS SANTOS, CNPAF; JAISON PEREIRA DE OLIVEIRA, CNPAF.
Título: | Nitrogen-use efficiency in lowland rice genotypes under field conditions.
Ano de publicação: | 2013
Fonte/Imprenta: | Communications in Soil Science and Plant Analysis, New York, v. 44, n. 17, p. 2497-2506, 2013.
ISSN: | 0010-3624
DOI: | 10.1080/00103624.2013.812732
Idioma: | Inglês
Conteúdo: | Rice is staple food for more than 50% of the world's population. Nitrogen (N) is one of the most yield-limiting nutrients for lowland rice production around the world. Two field experiments were conducted at two locations for two consecutive years to evaluate N-use efficiency of 12 lowland rice genotypes. Growth, grain yield, and yield components were significantly influenced by N as well as genotype treatments. Location × year × genotype and location × year × N interactions were significant for most of the growth, yield, and yield components, indicating influence of these factors on yield and yield components. Overall, the most N-efficient genotypes measured in terms of grain yield were BRA 031032, BRA 031044, and BRA 02654 and the most inefficient 15 genotypes were BRS Jaçana, BRS Fronteira, and BRA 02674. Genotypes had linear and quadratic responses to added N in the range of 0 to 200 kg ha-1. Nitrogen significantly influenced plant height, shoot dry weight, panicle number, and 1000-grain weights. Nitrogen-use efficiency (kg grain per kg N applied) varied from 33 to 49 kg grain per kg N applied, with an average value of 40 kg grain per kg N applied. The genotype BRA 20 031044 produced the greatest N-use efficiency, and the lowest N-use efficient genotype was BRS Fronteira. There was a significant linear association between N-use efficiency and grain yield.
Thesagro: | Arroz; Genótipo; Nitrogênio; Oryza sativa.
Thesaurus Nal: | Grain yield; Rice; Yield components.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (32229-1) - UPC - AP - DD - 2013.037 -  - 2013.037 - DIS