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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
07/11/2017 |
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Data da última atualização: |
07/11/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
FAGERIA, N. K. |
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Afiliação: |
NAND KUMAR FAGERIA, CNPAF. |
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Título: |
Potassium requirements of lowland rice. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Communications in Soil Science and Plant Analysis, v. 46, n. 12, p. 1459-1472, 2015. |
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DOI: |
10.1080/00103624.2015.1043444 |
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Idioma: |
Inglês |
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Conteúdo: |
Rice is a staple food for about 50 percent of the world's population. Potassium (K) is absorbed in large amounts by rice plants and adequate amounts of this element are fundamental to improve productivity and maintain sustainability of the cropping systems. A greenhouse experiment was conducted to determine the adequate rate of K for lowland rice grown on a Brazilian Inceptisol. The K rates used were 0, 50, 100, 200, 400, and 600mgKkg(-1) soil. Most of the growth, yield, and yield components were significantly and quadratically increased with increasing K levels. Based on a quadratic equation, maximum grain yield was obtained with the addition of 371mgKkg(-1) soil. Maximum plant height and shoot dry weight were obtained at 414 and 398mgKkg(-1) soil, respectively. Root growth (maximum length and dry weight) was also significantly increased in a quadratic fashion with the increasing K rate in the growth medium. Maximum root length was achieved at 58mgKkg(-1) whereas maximum root dry weight was obtained with the addition of 394mgKkg(-1) soil. Plant height, shoot dry weight, 1000-grain weight, root length, and root dry weight were significantly associated with grain yield. Hence, manipulation of these growth and yield components with the addition of K fertilizer can improve yield of lowland rice in varzea soils of central part of Brazil. Potassium uptake increased significantly in a quadratic fashion with increasing K rate. However, K-use efficiency (mg grain per mg K applied) decreased significantly with increasing K rate in a quadratic fashion. Maximum grain yield was obtained with 117mgkg(-1) Mehlich 1-extractable K, base saturation of 53 percent, Mg saturation of 9 percent, K saturation of 2 percent, and Ca/Mg ratio of 4. MenosRice is a staple food for about 50 percent of the world's population. Potassium (K) is absorbed in large amounts by rice plants and adequate amounts of this element are fundamental to improve productivity and maintain sustainability of the cropping systems. A greenhouse experiment was conducted to determine the adequate rate of K for lowland rice grown on a Brazilian Inceptisol. The K rates used were 0, 50, 100, 200, 400, and 600mgKkg(-1) soil. Most of the growth, yield, and yield components were significantly and quadratically increased with increasing K levels. Based on a quadratic equation, maximum grain yield was obtained with the addition of 371mgKkg(-1) soil. Maximum plant height and shoot dry weight were obtained at 414 and 398mgKkg(-1) soil, respectively. Root growth (maximum length and dry weight) was also significantly increased in a quadratic fashion with the increasing K rate in the growth medium. Maximum root length was achieved at 58mgKkg(-1) whereas maximum root dry weight was obtained with the addition of 394mgKkg(-1) soil. Plant height, shoot dry weight, 1000-grain weight, root length, and root dry weight were significantly associated with grain yield. Hence, manipulation of these growth and yield components with the addition of K fertilizer can improve yield of lowland rice in varzea soils of central part of Brazil. Potassium uptake increased significantly in a quadratic fashion with increasing K rate. However, K-use efficiency (mg grain per mg K applied) d... Mostrar Tudo |
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Thesagro: |
Arroz; Oryza sativa; Potassio. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02249naa a2200169 a 4500
001 2079108
005 2017-11-07
008 2015 bl uuuu u00u1 u #d
024 7 $a10.1080/00103624.2015.1043444$2DOI
100 1 $aFAGERIA, N. K.
245 $aPotassium requirements of lowland rice.$h[electronic resource]
260 $c2015
520 $aRice is a staple food for about 50 percent of the world's population. Potassium (K) is absorbed in large amounts by rice plants and adequate amounts of this element are fundamental to improve productivity and maintain sustainability of the cropping systems. A greenhouse experiment was conducted to determine the adequate rate of K for lowland rice grown on a Brazilian Inceptisol. The K rates used were 0, 50, 100, 200, 400, and 600mgKkg(-1) soil. Most of the growth, yield, and yield components were significantly and quadratically increased with increasing K levels. Based on a quadratic equation, maximum grain yield was obtained with the addition of 371mgKkg(-1) soil. Maximum plant height and shoot dry weight were obtained at 414 and 398mgKkg(-1) soil, respectively. Root growth (maximum length and dry weight) was also significantly increased in a quadratic fashion with the increasing K rate in the growth medium. Maximum root length was achieved at 58mgKkg(-1) whereas maximum root dry weight was obtained with the addition of 394mgKkg(-1) soil. Plant height, shoot dry weight, 1000-grain weight, root length, and root dry weight were significantly associated with grain yield. Hence, manipulation of these growth and yield components with the addition of K fertilizer can improve yield of lowland rice in varzea soils of central part of Brazil. Potassium uptake increased significantly in a quadratic fashion with increasing K rate. However, K-use efficiency (mg grain per mg K applied) decreased significantly with increasing K rate in a quadratic fashion. Maximum grain yield was obtained with 117mgkg(-1) Mehlich 1-extractable K, base saturation of 53 percent, Mg saturation of 9 percent, K saturation of 2 percent, and Ca/Mg ratio of 4.
650 $aArroz
650 $aOryza sativa
650 $aPotassio
773 $tCommunications in Soil Science and Plant Analysis$gv. 46, n. 12, p. 1459-1472, 2015.
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