Simulating Cassava Growth and Yield under Potential Conditions in Southern Brazil

Gabriel, Luana Fernandes; Streck, Nereu Augusto; Roberti, Débora Regina; Chielle, Zeferino Genésio; Uhlmann, Lilian Osmari; Silva, Michel Rocha da; Silva, Stefanía Dalmolin da

doi:10.2134/agronj2013.0187

Cited by 28 publications

(34 citation statements)

References 44 publications

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“…The experimental design in Santa Vitória do Palmar and in Uruguaiana was randomized blocks with 4 replicates. In Santa Maria and Cachoerinha, there was no experimental design and samplings were performed according to the methodology described by Gabriel et al (2014).…”

Section: Methodsmentioning

confidence: 99%

Number of leaves and phenology of rice hybrids simulated by the SimulArroz model

Ribas

Streck

Duarte

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TProcess-based-models can predict leaf and reproductive development of agricultural crops. The objective of this study was to calibrate and evaluate the SimulArroz model in simulating the number of leaves on the main culm and the phenology of three hybrid rice cultivars in Rio Grande do Sul, Brazil. Field experiments were conducted in Santa Maria, Cachoeirinha, Uruguaiana and Santa Vitória do Palmar, in Rio Grande do Sul state, in two growing seasons. Observations were made to determine the number of leaves in the main culm through the Haun scale and the phenology of three hybrid cultivars (PRIME CL, INOV CL and QM 1010 CL) and a conventional rice cultivar used as a control (IRGA 424). The calibration of the SimulArroz model was efficient for simulating the number of leaves and phenology as a function of the sowing date and maturity group of three hybrid rice cultivars in Rio Grande do Sul.Número de folhas e fenologia de híbridos de arroz simulado pelo modelo SimulArroz R E S U M O Modelos matemáticos baseado em processos podem prever o desenvolvimento folhar e reprodutivo de cultivos agrícolas. Objetivou-se, com este trabalho, calibrar e avaliar o modelo SimulArroz em simular o número de folhas e a fenologia de três cultivares de arroz híbrido no Rio Grande do Sul. Foram conduzidos experimentos de campo em Santa Maria, Cachoeirinha, Uruguaiana e Santa Vitória do Palmar, no Rio Grande do Sul, em dois anos agrícolas. Foram realizadas observações para determinar o número de folhas do colmo principal através da escala da Haun e a fenologia de três cultivares híbridas (PRIME CL, INOV CL e QM 1010 CL) e uma convencional de arroz usada como testemunha (IRGA 424). A calibração do modelo SimulArroz utilizada foi eficiente em simular o número de folhas e a fenologia em função da época de semeadura e do grupo de maturação de três cultivares híbridas de arroz irrigado no Rio Grande do Sul.

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Section: Methodsmentioning

confidence: 99%

Number of leaves and phenology of rice hybrids simulated by the SimulArroz model

Ribas

Streck

Duarte

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…Dentre essas variáveis, uma variável de desenvolvimento foliar geralmente quantificada é o filocrono, que é o intervalo de tempo entre o aparecimento de duas folhas sucessivas na haste de uma planta (Wilhelm & McMaster, 1995), e uma variável de crescimento importante é o índice de área foliar (IAF). Além disso, essas variáveis de crescimento e desenvolvimento são importantes em outras aplicações como, por exemplo, para a calibração de novas cultivares em modelos agrícolas baseados em processos, como o modelo de mandioca GUMCAS modificado (Gabriel et al, 2014).…”

Section: Introductionunclassified

Desempenho de cultivares de mandioca em ambiente subtropical

Tironi¹,

Uhlmann²,

Streck³

et al. 2015

Bragantia

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ResumoO objetivo deste trabalho foi avaliar e comparar as variáveis de crescimento, o desenvolvimento e os componentes de produtividade de raízes e hastes de cinco cultivares de mandioca em ambiente subtropical no Rio Grande do Sul, Brasil. O experimento de campo foi conduzido nos anos agrícolas de 2010-2011 e 2011-2012, em Santa Maria, RS, com cinco cultivares de mandioca (Fepagro-RS13, Fepagro-RS14, Estrangeira, Fécula Branca e Cascuda) no delineamento blocos ao acaso com quatro repetições em esquema bifatorial. Foram coletadas variáveis de crescimento e desenvolvimento como área foliar, altura de plantas e número de folhas e componentes de produtividade de raízes e hastes. As cultivares Fepagro-RS13 e Fepagro-RS14 possuem maior IAF com elevada produção de parte aérea e maior altura total comparadas às das cultivares Estrangeira, Fécula Branca e Cascuda por emitirem maior quantidade de ramificações simpodiais. As cultivares Fepagro-RS13 e Fepagro-RS14 possuem elevada produção tanto de parte aérea quanto de raiz, enquanto as cultivares Estrangeira, Cascuda e Fécula Branca possuem maior aptidão para produção de raízes tuberosas em ambiente subtropical no Rio Grande do Sul, Brasil.Palavras-chave: Manihot esculenta Crantz, desenvolvimento, raízes tuberosas, hastes, componentes de produtividade. Performance of cassava cultivars in subtropical environment AbstractThe objective of this study was to evaluate and compare variables of growth, development and yield components of roots and stems of five cassava cultivars in subtropical environment in Rio Grande do Sul, Brazil. A field experiment was conducted in the 2010-2011 and 2011-2012 growing seasons at Santa Maria, RS, with five cassava cultivars, Fepagro -RS 13, Fepagro -RS 13, Fepagro -RS 14, Estrangeira, Fécula Branca and Cascuda in a randomized block design with four replicates and a two factor scheme. Variables of growth and development such as leaf area, plant height and leaf number and yield components of roots and stems were collected. The cultivars Fepagro -RS 13 and Fepagro -RS 14 have the highest LAI, above-ground biomass and height compared to the cultivars Estrangeira, Fécula Branca and Cascuda, because the former have greater sympodial branching. Cultivars Fepagro -RS13 and Fepagro -RS 14 have high production of both above-ground and tuber roots whereas cultivars Estrangeira, Cascuda and Fécula Branca are adapted for tuber roots production in subtropical environment of Rio Grande do Sul, Brazil.

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“…The simulation model for cassava cropping proposed in this study, named "Simanihot" ("Si" for Simulator, and "manihot" for cassava's scientific name "Manihot esculenta Crantz L."), is originated from the GUMCAS model proposed by MATTHEWS & HUNT (1994) and modified by GABRIEL et al (2014). The main changes were a third developmental clock simulating the beginning of tuberization, a nonlinear model for leaf appearance rate, and a sensitivity coefficient that affects leaf senescence at a great proportion at minimum air temperatures equal to or lower than 5 ºC.…”

Section: Methodsmentioning

confidence: 99%

“…The performance of the model with the independent data (Table 1) was assessed by running the Simanihot model three times with water balance deactivated and three times activated (one round with each water balance model). Performance was evaluated using the root of the mean square error (RMSE), BIAS index, correlation coefficient (r), agreement index (dw), and model efficiency (EF) (GABRIEL et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…GUMCAS is a cassava model, developed by MATTHEWS & HUNT (1994), which underwent modifications for conditions without water stress, as found in the subtropical region of Rio Grande do Sul (Brazil), and was calibrated for the cultivar Fepagro -RS13 (GABRIEL et al, 2014). This cultivar is used as forage and has a tricotomic sympodial growth habit, bringing forth up to three sympodial branches during a single growing season (SAMBORANHA et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Simanihot: A Process-Based Model for Simulating Growth, Development and Productivity of Cassava

et al. 2017

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ABSTRACT:The objective of this study was to propose a model, named Simanihot, for simulating growth, development and yield of tuberous roots in cassava, with a choice of two soil water balance models. The model works on a day time step and is calibrated for five cassava cultivars (Fepagro -RS 14, Estrangeira, Cascuda, São José e Paraguaia), with different branching habits and different purpose of use (pasture, food and industry). The model has a graphical interface, where the user can choose one out of two soil water balance models, depending upon the number of known soil variables and details the user wants to know about soil water content.

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Simulating Cassava Growth and Yield under Potential Conditions in Southern Brazil

Cited by 28 publications

References 44 publications

Number of leaves and phenology of rice hybrids simulated by the SimulArroz model

Number of leaves and phenology of rice hybrids simulated by the SimulArroz model

Desempenho de cultivares de mandioca em ambiente subtropical

Simanihot: A Process-Based Model for Simulating Growth, Development and Productivity of Cassava

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