Improving predictions of leaf appearance in field grown potato

Streck, Nereu Augusto; Lago, Isabel; Paula, Fabiana Luiza Matielo de; Bisognin, Dílson Antônio; Heldwein, Arno Bernardo

doi:10.1590/s0103-90162007000100002

Cited by 12 publications

(13 citation statements)

References 22 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results are in agreement with STRECK et al (2006) who found that tuber initiation in potato is delayed in elevated temperature scenarios during the fall growing season, whereas tuber initiation was hastened during the spring growing season. Results also agree with observed results by STRECK et al (2007) that leaf appearance in potato grown during summer months in Subtropical climate was delayed compared to potato grown in the spring.…”

Section: Resultssupporting

confidence: 92%

“…LN= Σ LAR, from crop emergence to the appearance of the flag leaf. The WE model was calibrated and tested previously in Rio Grande do Sul conditions (STRECK et al, 2007), and the coefficients LAR max , T min , T opt and T max are genotype-specific. In this study we used the coefficients for Asterix, a cultivar widely used by potato growers in the State of Rio Grande do Sul: LAR max = 0.872 leaves day -1 , T min =7 ºC, T opt =21 ºC, and T max =30 ºC (STRECK et al, 2007).…”

Section: Thismentioning

confidence: 99%

“…In each growing season, five emergence dates were considered according to STRECK et al (2006): (day/month) 6/02, 13/02, 20/02, 27/02 and 06/03 for the Fall growing season and 26/07, 02/08, 09/08, 16/08 and 23/08 for the Spring growing season. It was assumed that the potato crop was irrigated, as the coefficients of the cultivar Asterix were obtained under irrigated conditions (STRECK et al, 2007). …”

Section: Thismentioning

confidence: 99%

“…Final leaf number was assumed 20 leaves in the Fall growing season and 24 leaves in the Spring growing season (STRECK et al, 2007).…”

Section: Thismentioning

confidence: 99%

See 3 more Smart Citations

Impact of elevated temperature scenarios on potato leaf development

Streck

Uhlmann²,

Zanon³

et al. 2012

Eng. Agríc.

View full text Add to dashboard Cite

ABSTRACT:The objective of this study was to simulate the impact of elevated temperature scenarios on leaf development of potato in Santa Maria, RS, Brazil. Leaf appearance was estimated using a multiplicative model that has a non-linear temperature response function which calculates the daily leaf appearance rate (LAR, leaves day -1 ) and the accumulated number of leaves (LN) from crop emergence to the appearance of the upper last leaf. Leaf appearance was estimated during 100 years in the following scenarios: current climate, +1 °C, +2 °C, +3 °C, +4 °C e +5 °C. The LAR model was estimated with coefficients of the Asterix cultivar in five emergence dates and in two growing seasons (Fall and Spring). Variable of interest was the duration (days) of the crop emergence to the appearance of the final leaf number (EM-FLN) phase. Statistical analysis was performed assuming a three-factorial experiment, with main effects being climate scenarios, growing seasons, and emergence dates in a completely randomized design using years (one hundred) as replications. The results showed that warmer scenarios lead to an increase, in the fall, and a decrease, in the spring growing season, in the duration of the leaf appearance phase, indicating high vulnerability and complexity of the response of potato crop grown in a Subtropical environment to climate change. KEYWORDS:Solanum tuberosum, global warming, leaf appearance, agricultural crops, food security. IMPACTO DE CENÁRIOS DE AUMENTO DE TEMPERATURA NODESENVOLVIMENTO FOLIAR DA BATATA RESUMO: O objetivo, neste trabalho, foi estimar o impacto de cenários de temperaturas elevadas no desenvolvimento foliar da cultura da batata, em Santa Maria-RS, Brasil. A emissão de folhas da cultura da batata foi estimada por um modelo multiplicativo com função de reposta não linear à temperatura que calcula a taxa diária de aparecimento de folhas (TAF, folhas dia -1 ) e o número acumulado de folhas (NF) a partir da data de emergência da cultura até o surgimento da última folha. A emissão de folhas foi estimada em 100 anos de cada um dos cenários climáticos: clima atual, +1 °C, +2 °C, +3 °C, +4 °C e +5 °C. O modelo da TAF foi estimado com coeficientes da cultivar Asterix, em cinco datas de emergência e em duas estações de cultivo (Outono e Primavera). A variável de interesse foi duração (em dias) da fase de emergência das plântulas até o aparecimento da folha final (EM-FF). A análise estatística constou de um experimento trifatorial, com os fatores principais sendo cenários climáticos, estações de cultivo e datas de emergência no delineamento inteiramente casualizado, com anos (cem anos) como repetições. Observou-se que cenários mais quentes levam a um aumento, no cultivo de outono, e a uma diminuição, no cultivo de primavera, da duração da fase de emissão de folhas, indicando grande vulnerabilidade e complexidade da resposta da batata cultivada em ambiente Subtropical à mudança climática. PALAVRAS-CHAVE:Solanum tuberosum, aquecimento global, emissão de folhas, culturas agrícolas, segurança alimentar.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Thismentioning

confidence: 99%

Section: Thismentioning

confidence: 99%

“…Final leaf number was assumed 20 leaves in the Fall growing season and 24 leaves in the Spring growing season (STRECK et al, 2007).…”

Section: Thismentioning

confidence: 99%

See 2 more Smart Citations

Impact of elevated temperature scenarios on potato leaf development

Streck

Uhlmann²,

Zanon³

et al. 2012

Eng. Agríc.

View full text Add to dashboard Cite

show abstract

“…Na determinação do coeficiente TAF máx do modelo de WE, foram estimadas equações de regressão não-linear múltipla para os valores do NF acumulado em função dos valores acumulados de f(T). A equação de regressão forneceu o valor do coeficiente TAF máx baseado no menor valor do quadrado médio do erro (QME) (Streck et al, 2006(Streck et al, , 2007. O valor do coeficiente TAF máx para E. grandis foi de 0,4107 folhas por dia e para E. saligna foi de 0,3180 folhas por dia.…”

Section: Methodsunclassified

Aparecimento de folhas em mudas de eucalipto estimado por dois modelos

Martins

Streck

2007

Pesq. agropec. bras.

Self Cite

View full text Add to dashboard Cite

Resumo -O objetivo deste trabalho foi avaliar e comparar os modelos do Filocrono e de Wang e Engel para estimativa do aparecimento de folhas em mudas de Eucalyptus grandis e E. saligna. Foram instalados dois experimentos em Santa Maria em 2005 e 2006, um, em campo, com nove épocas de semeadura, e o outro, em casa, de vegetação com duas épocas de semeadura. Os modelos usados foram o do Filocrono, que assume uma relação linear entre taxa de aparecimento de folhas e temperatura, e o de Wang e Engel, que assume uma relação não-linear entre taxa de aparecimento de folhas e temperatura. As quatro primeiras épocas de semeadura em campo foram usadas para estimar os coeficientes dos modelos utilizados. As épocas de semeadura restantes do experimento em campo e as duas épocas de semeadura, em casa de vegetação, foram utilizadas como dados independentes para avaliar os modelos. O modelo de Wang e Engel proporcionou estimativa mais precisa do número de folhas, com valor da raiz do quadrado médio do erro de 2,7 e 3,7 folhas, comparado com o modelo do Filocrono com 7,1 e 10 folhas para E. grandis e E. saligna, respectivamente.Termos para indexação: Eucalyptus grandis, Eucalyptus saligna, desenvolvimento vegetal, soma térmica, taxa de aparecimento de folhas. Leaf appearance in seedlings of eucalyptus estimated by two modelsAbstract -The objective of this work was to evaluate and compare the Phyllochron and the Wang and Engel models for estimation of leaves appearance in seedlings of Eucalyptus grandis and E. saligna. Two experiments were carried out in Santa Maria during 2005 and 2006. One was a field experiment with nine sowing dates, and the other was a greenhouse experiment with two sowing dates. Phyllochron model assumes a linear relationship between leaf appearance rate and temperature, and the Wang and Engel model assumes a non-linear relationship between leaf appearance number and temperature. Four sowing dates from the field experiment were used to estimate the models coefficients and the other sowing dates of the field and greenhouse experiments were used as independent data to evaluate the models. The Wang and Engel model better estimated the number of leaves, comprising a root mean square error (RMSE) of 2.7 and 3.7 leaves compared with the Phyllocron model with RMSE of 7.1 and 10 leaves for E. grandis and E. saligna, respectively.

show abstract

Chemical composition of potato tubers: the effect of cultivars and growth conditions

et al. 2017

View full text Add to dashboard Cite

The aim of the study involved evaluating the chemical composition of tubers of five potato cultivars that were grown under the same cultural practices in soils with low, medium, and high availability of phosphorus. The experimental designs corresponded to a randomized block with four replicates. Tuber samples were analyzed in terms of moisture, ash, protein, lipid, total sugar, fiber, starch, and phosphorus contents. The results suggested that increased availability of phosphorus in soil allowed the production of tubers with higher dry matter content, lower total sugar content, and a higher percentage of starch and protein. Hence, the aforementioned parameters constitute important factors corresponding to the nutritional and industrial quality of potatoes. Increased phosphorus availability in soil can promote significant changes in the composition of potato tubers, and thereby in potential uses of tubers.

show abstract

Improving predictions of leaf appearance in field grown potato

Cited by 12 publications

References 22 publications

Impact of elevated temperature scenarios on potato leaf development

Impact of elevated temperature scenarios on potato leaf development

Aparecimento de folhas em mudas de eucalipto estimado por dois modelos

Chemical composition of potato tubers: the effect of cultivars and growth conditions

Contact Info

Product

Resources

About