Data/hora: 25/06/2024 08:23:55

Biblioteca(s): 	Embrapa Meio-Norte.	
Data corrente: 	20/05/1996	
Data da última atualização: 	11/12/2014	
Autoria: 	DATNOFF, L. E.; SNYDER, G. H.; DEREN, C. W.	
Título: 	Influence of silicon fertilizer grades on blast and brown spot development and on rice yields.	
Ano de publicação: 	1992	
Fonte/Imprenta: 	Plant Disease, v. 76, n. 10, p. 1011-1013, Oct. 1992.	
Idioma: 	Inglês	
Conteúdo: 	Calcium silicate slag, applied as a source of plant-available silicon on silicon-deficient soils, reduces plant disease and increases yieldsof rice. The purpose of this experiment was to evaluate performance ofthree rates of application on disease and yield. Calcium silicate slagwas applied at 0,2.5, and 5.0 Mg/ha as a fine-grade material (100% < 0.15 mm), a standard grade material (90% < 2.36 mm), or as pellets (100% > 1 mm and < 3.35 mm) made from the fine-grade material. Brown spot (caused by Bipolaris oryzae) severities decreased over the controls by48-80%, 33-60%, and 2-33% for the fine, standard, and pelletized forms, respectively, in 1990 and 1991. Blast (caused by Pyricularia grisea)severities also decreased by 50%, 23%, and 4% for the fine, standard, and pelletized forms, in comparison with the control in 1991. Plant tissue silicon content and grain yields increased with increasing slag rates. Silicon content in plant tissue increased 131-246%, 208-122%, and 108-192% with the fine, standard, and pelletized forms, and yields increased 20-26%, 18%, and 4-11% for both years. The fine grade of silicon fertilizer was best for increasing silicon content and grain yields and for reducing the severity of brown spot and blast. These resultsare encouraging, since lower slag rates of finer grades may be used toreduce production costs while enhancing integrated management of several important rice diseases.	
Palavras-Chave: 	Silicato de calcio.	
Thesagro: 	Arroz; Brusone; Controle Químico; Oryza Sativa; Pyricularia Oryzae.	
Thesaurus Nal: 	nutrition.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Meio-Norte (CPAMN)	
Exemplares: 	CPAMN - (2311-1) - ADC - SP - PP - S 10582 -  - 0010582 - DIS