Estimativa das temperaturas cardinais e modelagem do desenvolvimento vegetativo em batata-doce

Abstract

RESUMOObjetivou-se, neste trabalho, determinar as temperaturas cardinais da batata-doce e comparar a simulação da emissão de nós com o modelo do plastocrono (linear) e com o modelo de Wang e Engel (não linear) além da melhor forma de entrada da temperatura do ar nos modelos. A calibração e o teste dos modelos foram feitos pelos dados de número de nós na haste principal de plantas de batata-doce, cultivar Princesa, coletados em experimentos conduzidos em Santa Maria, RS, Brasil, em sete épocas de plantio, nos anos 2010, 2011 e 2012. Melhor predição 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 versão com a temperatura média foi superior às temperaturas mínima e máxima, em ambos os modelos. Os dois modelos podem ser utilizados para simular o desenvolvimento vegetativo da batata-doce quando cultivada na época recomendada. Sugere-se, fora deste período, o uso do modelo de Wang e Engel. Palavras-chave: Ipomoea batatas, fenologia, plastocrono, temperatura do arEstimating cardinal temperatures and modeling the vegetative development of sweet potato ABSTRACT 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.

Simulation of oat development cycle by photoperiod and temperature

“…Combinations of meteorological variables along with coefficients of the species allow to simulate the development stages of the plants and predict important stages for the use of agronomic techniques. According to Erpen et al (2013), it is expected that the air temperature in the future can be higher than the current one, exposing the oat crop to temperatures above T opt with higher frequency, qualifying the possibility of using the WE-Streck model.…”

Temperatura base para abertura de floretes e antocrono em gladíolo

“…Essa variação também foi observada na estimativa da Tb para emissão de nós em melancia (Lucas et al, 2012) e em batata-doce (Erpen et al, 2013). Em função da variação, optou-se por fazer a média das épocas e cultivares (Tb = 5,8 ºC H" 6,0 ºC), como foi feito, segundo Lucas et al (2012), para melancia e, segundo Erpen et al (2013), para a batata-doce.…”

Estimating the development of landrace and improved maize cultivars as a function of air temperature

“…This sowing date was chosen for model calibration because all cultivars completed all stages of development. Rates were estimated by the minimum squares approach (ERPEN et al, 2013). The rates were subjected to analysis of variance (ANOVA) and the Tukey's Test at 5% error.…”

“…The rates were subjected to analysis of variance (ANOVA) and the Tukey's Test at 5% error. Model evaluation was with independent data from the other five sowing dates (Table 1) using the statistics Root Mean Square Error (RMSE), Normalized Root Mean Square Error NRMSE, BIAS index and correlation coefficient (r) (LOAGUE & GREEN, 1991;ERPEN et al, 2013).…”