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Estimating cardinal temperatures and modeling the vegetative development of sweet potato/ Estimativa das temperaturas cardinais e modelagem do desenvolvimento vegetativo em batata-doce

The objective of this study was to determine the cardinal temperatures of sweet potato and to compare the simulation of node appearance with the plastochron model (linear) and with Wang and Engel model (nonlinear) and the best way to input air temperature in the models. Model calibration and test we...

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Bibliographic Details
Published in:Revista brasileira de engenharia agrícola e ambiental 2013-11, Vol.17 (11), p.1230
Main Authors: Erpen, Ligia, Streck, Nereu A, Uhlmann, Lilian O, Langner, Josana A, Winck, Jose E.M, Gabriel, Luana F
Format: Article
Language:Spanish
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Summary:The objective of this study was to determine the cardinal temperatures of sweet potato and to compare the simulation of node appearance with the plastochron model (linear) and with Wang and Engel model (nonlinear) and the best way to input air temperature in the models. Model calibration and test were conducted with data of number of nodes on the main stem of sweet potato, cultivar Princesa, collected in experiments carried out in Santa Maria, RS, Brazil, at seven planting dates in 2010, 2011 and 2012 growing seasons. Better model predictions were obtained using the cardinal temperatures of 12, 30 and 40 °C. The plastochron and Wang and Engel models showed similar performance. The version of the models that uses mean temperature as input was superior to the version with the minimum and maximum temperatures as input. Both models can be used to simulate the development of sweet potatoes when it is cultivated in the recommended period. Outside this period it is suggested to use the Wang e Engel model. Key words: Ipomoea batatas, phenology, plastochron, air temperature Objetivou-se, neste trabalho, determinar as temperaturas cardinais da batata-doce e comparar a simulacao da emissao de nos com o modelo do plastocrono (linear) e com o modelo de Wang e Engel (nao linear) alem da melhor forma de entrada da temperatura do ar nos modelos. A calibracao e o teste dos modelos foram feitos pelos dados de numero de nos na haste principal de plantas de batata-doce, cultivar Princesa, coletados em experimentos conduzidos em Santa Maria, RS, Brasil, em sete epocas de plantio, nos anos 2010, 2011 e 2012. Melhor predicao dos modelos foi obtida com o uso das temperaturas cardinais 12, 30 e 40°C. Os modelos plastocrono e Wang e Engel apresentaram desempenho semelhante. A versao com a temperatura media foi superior as temperaturas minima e maxima, em ambos os modelos. Os dois modelos podem ser utilizados para simular o desenvolvimento vegetativo da batata-doce quando cultivada na epoca recomendada. Sugere-se, fora deste periodo, o uso do modelo de Wang e Engel. Palavras-chave: Ipomoea batatas, fenologia, plastocrono, temperatura do ar
ISSN:1415-4366