Title:	Evapotranspiration and grain yield of upland rice as affected by water deficit.
Authors:	GUIMARÃES, C. M. STONE, L. F. SILVA, A. C. de L.
Affiliation:	CLEBER MORAIS GUIMARAES, CNPAF; LUIS FERNANDO STONE, CNPAF; ANA CLAUDIA DE L. SILVA, INSTITUTO FEDERAL DE GOIÁS.
Date Issued:	2016
Citation:	Revista Brasileira de Engenharia Agrícola e Ambiental, Campina Grande, v. 20, n. 5, p. 441-446. 2016.
Description:	To achieve an accurate phenotyping for drought tolerance, it is important to control water stress levels and timing. This study aimed to determine water use by upland rice plants during periods of irrigation withholding and its relationship with grain yield in order to increase the efficiency of this phenotyping. Two experiments were carried out in a randomized block design in which six water treatments (irrigation withholding for periods of 2, 4, 6, 8, 10 and 12 days) were compared, with four replicates. In the first experiment, treatments were applied at the R3 stage (panicle exsertion) and, in the second, at the R5 stage (beginning of grain filling). The amount of water evapotranspired was determined by the difference between the soil water storage at the beginning and at the end of irrigation withholding periods, from the surface to 80-cm depth. Evapotranspiration of upland rice from R3 stage was higher compared to that observed from R5 stage, when subjected to similar irrigation withholding periods in both growth stages. Rice grain yield is more sensitive to irrigation withholding imposed from R5 stage than from R3 stage.
Thesagro:	Arroz Oryza sativa Deficiência hídrica Irrigação Evapotranspiração
Keywords:	Estádios de desenvolvimento Supressão da irrigação
ISSN:	1807-1929
DOI:	10.1590/1807-1929/agriambi.v20n5p441-446
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAF)