Data/hora: 21/09/2024 21:49:29

Biblioteca(s): 	Embrapa Pesca e Aquicultura.	
Data corrente: 	11/01/2018	
Data da última atualização: 	05/02/2019	
Autoria: 	REIS, A. F. de B.; ALMEIDA, R. E. M. de; LAGO, B. C.; TRIVELIN, P. C.; LINQUIST, B.; FAVARIN, J. L.	
Afiliação: 	ANDRE FROES DE BORJA REIS, ESALQ; RODRIGO ESTEVAM MUNHOZ DE ALMEIDA, CNPASA; BRUNO COCCO LAGO, ESALQ; PAULO CESAR TRIVELIN, CENA; BRUCE LINQUIST, UNIVERSITY CALIFORNIA, Davis-CA; JOSE LAERCIO FAVARIN, ESALQ.	
Título: 	Aerobic rice system improves water productivity, nitrogen recovery and crop performance in Brazilian weathered lowland soil.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Field Crops Research, v. 218, p. 59-68, 2018.	
ISSN: 	0378-4290	
DOI: 	10.1016/j.fcr.2018.01.002	
Idioma: 	Inglês	
Conteúdo: 	Worldwide, rice systems are faced with the challenge of producing higher yields with less water. Water savings practices such as aerobic system and alternate wetting and drying (AWD) are being evaluated in lowland rice systems. However, few studies have been conducted on this subject in tropical South America where soils are highly weathered. Thus, a three-year field experiment was conducted in Brazil on a lowland Plinthaquults to investigate crop performance, water input productivity (WPin) and N recovery under five irrigation regimes: continuous flooding (CF); AWD with short cycle (AWDS); AWD with long cycle (AWDL); saturated soil without ponded water (SS); and aerobic (AR). The drying events in AWDS occurred more frequently than in AWDL. The experimental design was a split-plot with irrigation regimes in the main plot and N fertilizer rate, 0 or 150 kg N ha-1, in the subplot. 15N micro-plots were set up to examine the fate of N fertilizer. The highest grain yields for 150N and 0N treatments resulted from the AR irrigation regime and averaged 9.1 and 6.5 mg ha-1, respectively. Yields among the others irrigations regimes varied from year to the next, but the average was 8.5 and 5.4 mg ha-1 in the 150N and 0N treatments, respectively. Higher yields are attributed to higher N uptake and greater N recovery in the AR treatment. Apparent N recovery averaged 58% in the AR treatment compared to 34% in the other treatments. Similarly, total recovery (plant and soil) of 15N in the AR treatment was 82%, compared to 62, 61, 56, 56% in SS, AWDS, AWDL, CF respectively. Higher N recovery in the AR was likely the result of lower N losses. Irrigation inputs ranged from 15mm in the AR to 1337mm in the CF treatment. The WPin (kg m-3) averaged 0.8 in AR, and 0.5, 0.4, 0.5 and 0.4 in SS, CF, AWDS, AWDL and CF. Thus, in this environment, rice productivity, water productivity, and N use efficiency were all enhanced in aerobic systems relative to continuous flooding or any alternative irrigation regime.	
Palavras-Chave: 	Isotopic recovery; Water saving.	
Thesagro: 	Arroz; Oryza sativa.	
Thesaurus Nal: 	Nutrient use efficiency; Rice; Ultisols.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
Registro original: 	Embrapa Pesca e Aquicultura (CNPASA)	
Exemplares: 	CNPASA - (632-1) - UPC - AP - DD - CNPASA_AP03 -  - 2018.003 - DIS