Data/hora: 02/06/2024 10:46:50

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	21/11/2014	
Data da última atualização: 	21/11/2014	
Autoria: 	ZARO, G. C.; RICCE, W. S.; CARAMORI, P. H.; COSTA, A. B. F.; ROSISCA, J. R.; MORAIS, H.	
Título: 	Impacts of water deficit on the productivity of soybean and corn in Paraná state	
Ano de publicação: 	2014	
Fonte/Imprenta: 	In: CONGRESSO BRASILEIRO DE METEOROLOGIA, 18.., 2014, Recife-PE. Anais... Rio de Janeiro: SBMET, 2014.	
Idioma: 	Português	
Conteúdo: 	The state of Paranáis one of the largest agricultural producers in Brazil, contributing in 2012 with 17% of the national production of soybean and 20.2% of corn, according to official statistics. The occurrence of dry periods during the growing season has been a major cause of losses in the Paraná grain farming. In this work was conducted a study of the impact of dry spells between November to February on the productivity of soybean and corn in Paraná. Yield data of these cropswere obtainedfrom the State Secretariat of Agriculture (SEAB/DERAL) for six regionsin Paraná state: Midwest, West, North, West, South and Southwest. Seven cropping years were analyzed: 2007/2008 to 2013/2014. The average productivities by regions were analyzedrelative to the best year of each region, considered as the potential production, calculating the relative losses in each year. Relative losses were confronted with water stress in the period from November to January in each region. We identified the years 2008/2009 (with severe water deficit from mid-November to late December), 2011/2012 (with water deficit in December-January) and 2013/2014 as the worst years for both crops. There was a linear relationship between relative yield loss of soybeans and corn and the accumulated water deficit in the months of November to January.Taking the prices of agricultural products in their respective years, accumulated losses of $ 6.872 billion dollars for soybeans and $ 1.798 billion dollars for corn were calculated during the seven years analyzed. The northwestern region has lower yield potential and large losses, due to sandy soils with low water retention and increased soil water deficit. The southern region has more stable yields due to lower water deficiency. The use of best practices of soil management and irrigation, especially in the north, northwest, west and southwest are alternatives to reduce losses and achieve stable and increasing productivity in accordance with the best technologies.	
Palavras-Chave: 	crop losses; water balance; yield.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_35205.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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