Data/hora: 26/06/2024 09:39:02

Biblioteca(s): | Epagri-Sede.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - B
Data corrente: | 15/05/2020
Data da última atualização: | 15/05/2020
Autoria: | OGOSHI, C.; CARLOS, F. S.; WALDOW, D.; MIRANDA, F. F.; REGINATO, J. L.; ULGUIM, A. R.
Título: | Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil.
Ano de publicação: | 2020
Fonte/Imprenta: | Journal of Soil Science and Plant Nutrition, Suécia, 2020.
Idioma: | Inglês

Conteúdo:

In recent decades, nitrogen fertilization rates have increased significantly in irrigated rice fields in southern Brazil. However, there
is a gap in knowledge concerning the use of these high rates of nitrogen fertilization in cultivars with a high yield potential, and
susceptible to rice blast. We therefore conducted a field experiment in the 2014/2015 and 2015/2016 crop year to evaluate blast
severity, plant tissue nutrition, and yield and grain quality with increasing nitrogen fertilization levels in a rice blast-susceptible
cultivar (Guri Inta CL). The experiment had three factors, with factor 1: N doses (0, 60, 120, and 180 kg ha&#8722;1
), factor 2: sowing dates (early and late), and factor 3: with and without fungicide application. The experimental design was randomized blocks with
four replications. The area under the disease progress curve was positively influenced by the increase of N rates in the two crops
years. Grain yield had a negative quadratic effect as a function of N rates. Increased N levels reduced the thousand grains weight.
Late sowing and non-application of fungicide increased disease severity; there was reduced yield, grain quality, and N use
efficiency. It is concluded that the use of N levels greater than 60 kg ha&#8722;1 in rice blast-susceptible cultivars in southern Brazil
increases disease severity with lower N use, reduces grain yield and grain quality.

Palavras-Chave: | Irrigated rice; Magnaporthe oryzae; Plant nutrition.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_45370.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (104629-1) - UPC - AP - DD -  -  -  - DIS