Survey of the Silicon Status of Flooded Rice in Louisiana

Abstract

A gronomy J our n al • Volu me 102 , I s sue 2 • 2 010 523 ABSTRACT Low Si content in rice (Oryza sativa L.), sugarcane (Saccharum offi cinarum L.), and other Si-accumulating crops can adversely aff ect crop performance by increasing susceptibility to abiotic and biotic stresses. Although it is generally assumed in the United States that soils containing appreciable amounts of silicate clays supply adequate Si to meet crop demands, there is little evidence to support this assumption. A survey was conducted to assess the Si status of rice plants at mid-tiller (Y-leaf) and at harvest (straw) in 97 rice fi elds located throughout the rice-growing regions of Louisiana. On average, Y-leaves contained 30.5 ± 7.8 g Si kg -1 , whereas mature rice straw contained 54.7 ± 12.7 g Si kg -1 . Low early season Si assimilation occurred in nearly all rice fi elds, whereas only 36% contained mature straw with <50 g Si kg -1 , a level commonly used to indicate suffi ciency. Late-season defi ciencies were limited to fi elds in extreme southwest Louisiana where soils tend to be strongly acidic and have a long history of rice production.

Silicon Potential as Attenuator of Salinity Effects on Growth and Post-harvest Quality of Lettuce

“…In conditions of salt stress, positive effects of this mineral have already been verified in crops such as wheat, cashew, rice, corn, tomato, among others (Tuna et al, 2008;Miranda et al, 2010;Kraska & Breitenbeck, 2010;Lima et al, 2011;Li et al, 2015).…”

Impact of 60 Years of Intensive Rice Cropping on Clay Minerals in Soils Due to Si Exportation

“…see synthesis by [18,19]. However, the impact of rice crops on the mineralogy of silicate minerals of soil has not been thoroughly investigated because it is assumed that soils contain large amounts of Si so that this is not a limiting factor [25].…”

Silício Atenua Os Efeitos Do Estresse Salino Nas Fases Iniciais De Crescimento Da Alface?

“…Dentre as quais, Algaroba (Prosopis juliflora (Sw) DC.) (Bradbury & Ahmad, 1990), moringa (Moringa oleífera Lam) (Miranda et al, 2002), cajueiro (Anacardium occidentale L.) (Miranda et al, 2010), arroz (Oriza sativa L.) (Kraska & Breitenbeck, 2010), milho (Zea mays L.) (Lima et al, 2011) e trigo (Triticum aestivum L.) (Tuna et al, 2008) O experimento foi conduzido no delineamento inteiramente casualizado, com quatro repetições, em esquema fatorial com duas cultivares de alface (Great Lakes 659 e Lucy Brown) e seis concentrações combinadas de SiO2 e NaCl (0,0 mM de SiO2 e de NaCl; 6,0 mM de SiO2 + 0,0 de NaCl; 0,0 de SiO2 + 150 mM de NaCl; 6,0 mM SiO2 + 150 mM NaCl; 0,0 de SiO2 + 200 mM de NaCl; 6,0 mM SiO 2 + 200 mM NaCl). Das cultivares utilizadas, comprovou-se experimentalmente (dados ainda não publicados) que a Great Lakes 659 é sensível e a Lucy Brown tolerante ao estresse salino por NaCl na fase de crescimento inicial.…”