Data/hora: 17/06/2024 12:40:52

Biblioteca(s): | Embrapa Arroz e Feijão.
Data corrente: | 06/10/1994
Data da última atualização: | 18/06/2020
Autoria: | FAGERIA, N. K.
Afiliação: | NAND KUMAR FAGERIA, CNPAF.
Título: | Influence of potassium concentration on growth and potassium uptake by rice plants.
Ano de publicação: | 1976
Fonte/Imprenta: | Plant and Soil, v. 44, n. 3, p. 567-573, June 1976.
Idioma: | Inglês
Conteúdo: | Rice plants (Oryza sativa L.) were grown for 125 days in nutrient solutions maintained at constant potassium concentrations over the rate 51 to 1534 uM. Data are recorded at different growth stages for relative growth rate, potassium content, absorption rate of this element per gram dry weight of roots per day and its utilization in dry-matter production. Optimum concentration for maximum growth was found to be about 256 uM or 10 ppm potassium. Growth was more or less constant beyond this concentration. The maximum growth was characterized by a certain relative absorption rate (IM) for maximum growth ranging from 106 to 757 &#956;g-atom of potassium per g dry weight of roots per day, during the period of cultivation. In general the content of this element in tops as a percentage of the total content does not change appreciably either under different concentrations or at different ages. When the concentration of the solution increased, the utilization of potassium (dry-matter production per unit element content) decreased. The ratio between the relative growth rate (RGR) and relative absorption rate (IM) for maximum growth of rice ranged 1.4 during the first phase of growth to 1.3 at maturity of the crop. Higher ratios indicate an insufficient nutrient supply, lower ratios, however, either an abundant supply or a depressing effect of the solution on growth.
Thesagro: | Arroz; Oryza Sativa; Potássio.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Arroz e Feijão (CNPAF)
Exemplares: | CNPAF - (6290-1) - UPC - AP - PP - 1976 -  - 1976 - DIS