Impacts of Climate Change on Soybean Irrigation Water Requirements in Northwest Region of Rio Grande do Sul, Brazil
Tirzah Moreira de Melo*, José Antônio Saldanha Louzada and Olavo Correa Pedrollo
Institute of Hydraulic Researches - Federal University of Rio Grande do Sul (IPH/UFRGS), Bento Gonçalves Av, 9500, P.O. Box 15029, Porto Alegre City, State of Rio Grande do Sul, Brazil
- *Corresponding Author:
- Tirzah Moreira de Melo
Institute of Hydraulic Researches - Federal University
of Rio Grande do Sul (IPH/UFRGS), Bento Gonçalves Av., 9500
P.O. Box 15029, Porto Alegre City
State of Rio Grande do Sul, Brazil
Tel: 55 53 30255894
Fax: 55 51 33087291
E-mail: [email protected]
Received September 23, 2014; Accepted December 03, 2014; Published December 05, 2014
Citation: de Melo TM, Louzada JAS, Pedrollo OC (2014) Impacts of Climate Change on Soybean Irrigation Water Requirements in Northwest Region of Rio Grande do Sul, Brazil. Irrigat Drainage Sys Eng 3:129. doi:10.4172/2168-9768.1000129
Copyright: © 2014 de Melo TM, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Higher temperatures and a larger variability in precipitation will cause, in general, higher irrigation water requirements. The most important non-irrigated crops for the economy of the state of Rio Grande do Sul, Brazil, are corn and soybeans and the mesoregion which most contributes to the annual harvests of these crops is the Northwest region. This article aims to assess whether the impacts of climate change on agriculture in this region will be positive or negative and in what intensity they may occur. Hence, data from future climate projections generated by different climate models, as well as soil sampling for characterizing physical and hydraulic soil properties were considered. The one-dimensional SWAP model was used to estimate the irrigation water requirements. The results of the hypothesis tests performed for all simulations supports the premise that the irrigation water requirements in the near future (2025s) are not statistically different from the baseline period (1960-1990). On the other hand, water irrigation requirements in 2055s and 2085s reject this hypothesis.