Data/hora: 12/06/2024 00:37:18

Provedor de dados: 	Phyton: Revista Internacional de Botánica Experimental	
País: 	Argentina	
Título: 	Nitrate reductase activity, biomass, yield, and quality in cotton in response to nitrogen fertilization	
Autores: 	Hernández-Cruz,AE; Sánchez,E; Preciado-Rangel,P; García-Bañuelos,M L; Palomo-Gil,A; Espinoza-Banda,A.	
Data: 	2015-12-01	
Ano: 	2015	
Palavras-chave: 	Gossypium hirsutum L; Nitrogen assimilation; Yield.	
Resumo: 	In the production of cotton (Gossypium hirsutum L.), nitrogen fertilization is one of the most costly crop practices, but important to reach high yields. However, high nitrogen (N) content in plants does not always translate into a high fibre production. One way of assessing the efciency of the N fertilizer is through the enzymatic activity of the nitrate reductase (NR). This is a key enzyme in N assimilation, whose activity is regulated by a number of endogenous and exogenous factors that determine yield. The aim of this study was to assess the efect of N fertilization on yield, fibre quality, biomass, and NR enzymatic activity in vivo in the cotton variety Fiber Max 989. The evaluated application rates were 0, 50, 100, and 150 kg/ha of N, using urea as a source (46% N) in a randomizedblock design with three replicates. At harvest, the maximum yield of seed cotton and the greatest accumulation of total foliar biomass through time was reached after applying 150 kg N/ha. The different N-application rates did not affect the components of cotton-fibre quality. The activity of endogenous NR was greater on plants where 150 kg N/ha were applied. The highest cotton yield and N contents were obtained on these plants. Therefore, the NR activity in vivo could be used as a bioindicator of the N nutritional level in cotton.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000200026	
Editor: 	Fundación Rómulo Raggio	
Formato: 	text/html	
Fonte: 	Phyton (Buenos Aires)  v.84 n.2 2015	
Fonte: 	info:eu-repo/semantics/openAccess