Data/hora: 23/09/2024 06:18:29

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	20/05/2004	
Data da última atualização: 	06/06/2022	
Autoria: 	FAGERIA, N. K.; SANTOS, A. B. dos; MORAES, M. F. de.	
Afiliação: 	NAND KUMAR FAGERIA, CNPAF; ALBERTO BAETA DOS SANTOS, CNPAF.	
Título: 	Yield, potassium uptake, and use efficiency in upland rice genotypes.	
Ano de publicação: 	2010	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, v. 41, n. 22, p. 2676-2684, Nov. 2010.	
DOI: 	https://doi.org/10.1080/00103624.2010.517882	
Idioma: 	Inglês	
Conteúdo: 	Potassium (K) is an essential nutrient for higher plants. Information on K uptake and use efficiency of upland rice under Brazilian conditions is limited. A greenhouse experiment was conducted with the objective to evaluate influence of K on yield, K uptake, and use efficiency of six upland rice genotypes grown on Brazilian Oxisol. The K rate used was zero (natural soil level) and 200 mg K kg?1 of soil. Shoot dry weight and grain yield were significantly influenced by K level and genotype treatments. However, K × genotype interactions were not significant, indicating similar responses of genotypes at two K levels for shoot dry weight and grain yield. Genotypes produced grain yield in the order of BRS Primavera > BRA 01596 > BRSMG Curinga > BRS 032033 > BRS Bonança > BRA 02582. Potassium concentration in shoot was about sixfold greater compared to grain, across two K levels and six genotypes. However, K utilization efficiency ratio (KUER) (mg shoot or grain yield / mg K uptake in shoot or root) was about 6.5 times greater in grain compared to shoot, across two K level and six genotypes. Potassium uptake in shoot and grain and KUER were significantly and positively associated with grain yield. Soil calcium (Ca), K, base saturation, acidity saturation, Ca saturation, K saturation, Ca/K ratio, and magnesium (Mg)/K ratio were significantly influenced by K application rate.	
Palavras-Chave: 	K uptake in grain; K uptake in shoot; K-use efficiency ratio.	
Thesagro: 	Arroz; Genótipo; Oryza Sativa; Potássio.	
Thesaurus Nal: 	Harvest index; Nutrient use efficiency; Potassium; Rice.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (21445-1) - UPC - AP - DD - 2010 -  - 2010 - DIS