Data/hora: 23/09/2024 18:37:49

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	08/01/2018	
Data da última atualização: 	08/01/2018	
Autoria: 	MORO, E.; CRUSCIOL, C. A. C.; NASCENTE, A. S.; CANTARELLA, H.; BROETTO, F.; MORO, A. L.	
Afiliação: 	EDEMAR MORO, UNOESTE; CARLOS ALEXANDRE COSTA CRUSCIOL, UNESP, Botucatu-SP; ADRIANO STEPHAN NASCENTE, CNPAF; HEITOR CANTARELLA, IAC; FERNANDO BROETTO, UNESP, Botucatu-SP; ADRIANA LIMA MORO, UNOESTE.	
Título: 	Nitrate reductase, micronutrients and upland rice development as influenced by soil pH and nitrogen sources.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, New York, v. 48, n. 22 p. 2642-2651, 2017.	
DOI: 	10.1080/00103624.2017.1416137	
Idioma: 	Inglês	
Conteúdo: 	The average yield of upland rice under no-tillage system (NTS), a sustainable soil management, is lower than in conventional tillage (one plowing and two disking). One of the reasons given for this drop in crop grain yield would be the low-nitrate assimilation capacity of rice seedlings, due to the low activity of the nitrate reductase (NR) enzyme in the early development phase. A greenhouse experiment was conducted to evaluate the effects of the soil acidic and nitrogen source in the micronutrient concentrations, NR activity and grain yield of upland rice growing under NTS. The soil used in the experiment was an Oxisol. The experimental design was completely randomized in a factorial 3 × 4. Treatments consisted of three levels of soil acidity (high, medium, and low) combined with four nitrogen sources (nitrate, ammonium, ammonium + nitrification inhibitor, and control ? without N fertilization). The reduction of soil acidity reduced the concentration of zinc and manganese in rice plants. Generally, the activity of the NR enzyme was higher in plants grown in soils with low acidity and fertilized with calcium nitrate. There was a greater response in growth and yield in rice plants grown in soils with high acidity. Under medium acidity, rice plants grown with ammonium sulfate were more productive (no differences were detected with the addition of the nitrification inhibitor).	
Palavras-Chave: 	Ammonium; Soil acidity.	
Thesagro: 	Acidez do solo; Arroz; Fertilidade do solo; Microelemento; Nitrato redutase; Nitrogênio; Oryza sativa; PH.	
Thesaurus Nal: 	Nitrate reductase; Nitrates; Rice; Soil fertility; Yields.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (35068-1) - UPC - AP - DD - 2017 -  - 2017 - DIS