Estudos sobre a nutrição mineral do arroz: X. marcha de absorção de micronutrientes pela variedade IAC-25

Abstract

RESUMOEm condições controladas estudaram-se: acumulação de micronutrientes e produção de ma¬ teria seca pela variedade de arroz IAC-25.A curva que descreve a produção de matéria seca total em função do tempo apresentou a * Com ajuda da FAPESP e do CNPq. Entregue para publicação em 14/12/1981.

Micronutrient and Silicon Uptake and Removal by Upland Rice Cultivars with Different Plant Architecture

“…In these cultivars, the period of greatest demand for nutrients occurred from tillering to grain formation, i.e., from 65 to 80 DAE, when the uptake rates reached maximum values (Figures 1f, 2f, 3f, 4f, 5f, and 6f). In other studies, the maximum micronutrient uptake rates by the rice plants occurred in this same crop phase (Gilmour, 1977;Malavolta et al, 1981a). In the Maravilha cultivar, the maximum accumulations of micronutrients and Si occurred on average two to three weeks after the period of maximum accumulation of these nutrients by the other cultivars, and the maximum uptake rates of the Maravilha cultivar always occurred after 80 DAE (Figures 1d,1f,2d,2f,3d,3f,4d,4f,5d,5f,6d,and 6f).…”

“…There are many older studies available in the literature on the nutritional demands of rice for micronutrients and Si (Gilmour, 1977;Malavolta et al, 1981aMalavolta et al, ,b, 1982Ma et al, 1989), as well as more recent studies by Fageria (2004) and Mauad et al (2013). However, in most of these studies, rice was grown in greenhouse or the studies used traditional cultivars, whereas some cultivars were recommended only for flooded growing conditions.…”