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Provedor de dados:  Ciência Rural
País:  Brazil
Título:  Risk of water surplus in soybean crop on haplic planosol soil in the Central Depression of Rio Grande do Sul State, Brazil
Autores:  Bortoluzzi,Mateus Possebon
Heldwein,Arno Bernardo
Lucas,Dionéia Daiane Pitol
Righi,Evandro Zanini
Data:  2017-01-01
Ano:  2017
Palavras-chave:  Glycine max
Water balance
Numerical analysis
Probability distribution function
Resumo:  ABSTRACT: The aim of this study was to identify soybean sowing dates on which there was low water surplus risk. The crop was raised on a Haplic Planosol soil in the Central Depression of Rio Grande do Sul, Brazil. Soybean development simulations and daily water balances were calculated for different sowing dates from August 1968 to July 2012. Water surplus data was subjected to BoxPlot analyses and Scott-Knott tests at a 5% error probability. Exponential, gamma, lognormal, normal and Weibull functions were tested and the best fits to the data were obtained for both subperiods and total cycle. The highest number of fits for the development cycle and subperiods were obtained using the gamma and weibull functions, respectively. For sowing carried out after November 1, there was a low water surplus risk in the sowing-emergence subperiod. The risk of water surplus during the development cycle decreased with the advance of the sowing date.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Universidade Federal de Santa Maria
Relação:  10.1590/0103-8478cr20160170
Formato:  text/html
Fonte:  Ciência Rural v.47 n.2 2017
Direitos:  info:eu-repo/semantics/openAccess

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