Densidade amostral aplicada ao monitoramento georreferenciado de lagartas desfolhadoras na cultura da soja

Riffel, Cinei; Garcia, Mauro Silveira; Santi, Antônio Luis; Basso, Claudir José; Flora, Lisandra Pinto Della; Cherubin, Maurício Roberto; Eitelwein, Mateus Tonini

doi:10.1590/s0103-84782012005000116

Cited by 16 publications

(17 citation statements)

References 15 publications

(27 reference statements)

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“…The soybean stages in which it was observed an increase in population level were from R3 (beginning of pod formation) to R5 (beginning of grain filling). Similar results were found by Riffel et al (2012) in studies on the sample density of defoliating velvetbean caterpillars where the highest population density was during the R5 stage. However, C. includens showed higher peaks in the reproductive stage (V7 -R6), while A. gemmatalis larger peaks occurred from the R5 stage …”

Section: Resultssupporting

confidence: 88%

Lepidopteran pests associated with the soybean cultivars phenology

Carneiro¹,

Silva²,

Silva³

et al. 2018

Biosci. J.

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ABSTRACT:Lepidopteran pests are one of the major constraints to the soybean production potential, whose defoliating caterpillars can occur throughout the crop cycle causing serious damage. Therefore, the objective was to study the population fluctuation of lepidopteran pests and the association of species with the growth stages of soybean cultivars in the Cerrado of Piaui State, Brazil, in order to obtain data to support integrated pest management in the crop. The experiments had as a source of variation thirteen cultivars with fourteen evaluations. The design used was completely randomized in split plots being the cultivars plots and subplots the cultivars phenological stages. The monitoring was conducted by shake-cloth method at random points. Weekly samplings were performed. Generally, species of lepidopteran pests occurred in all soybean phenological stages, especially Chrysodeixis includens and Anticarsia gemmatalis that were present from the beginning to the end of the crop.

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Section: Resultssupporting

confidence: 88%

Lepidopteran pests associated with the soybean cultivars phenology

Carneiro¹,

Silva²,

Silva³

et al. 2018

Biosci. J.

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“…These same conclusions were also found by RIFFEL et al (2012) in their study of the spatial and temporal distributions of pest insects on soybean crop. Moreover, RIFFEL et al (2012) emphasized that better detailed thematic maps generates a greater amount of informations obtained for the study area, promoting a decision with greater scientific basis.…”

Section: Resultssupporting

confidence: 84%

“…Moreover, RIFFEL et al (2012) emphasized that better detailed thematic maps generates a greater amount of informations obtained for the study area, promoting a decision with greater scientific basis.…”

Section: Resultsmentioning

confidence: 99%

“…The number of sample elements available to conduct research on the spatial dependent variables and their respective sample configuration, may affect the description of the spatial dependence structure, or more, the spatial estimates of non-sampled values obtained by the kriging interpolation technique, and consequently the reliability of the results shown by the thematic map (URIBE-OPAZO et al, 2007;COELHO et al, 2009;ODA-SOUZA et al, 2010;GUEDES et al, 2011;RIFFEL et al, 2012;SOUZA et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Soybean yield maps using regular and optimized sample with different configurations by simulated annealing

et al. 2016

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ABSTRACT:This study aimed to compare thematic maps of soybean yield for different sampling grids, using geostatistical methods (semivariance function and kriging). The analysis was performed with soybean yield data in t ha -1 in a commercial area with regular grids with distances between points of 25x25 m, 50x50 m, 75x75 m, 100x100 m, with 549, 188, 66 and 44 sampling points respectively; and data obtained by yield monitors. Optimized sampling schemes were also generated with the algorithm called Simulated Annealing, using maximization of the overall accuracy measure as a criterion for optimization. The results showed that sample size and sample density influenced the description of the spatial distribution of soybean yield. When the sample size was increased, there was an increased efficiency of thematic maps used to describe the spatial variability of soybean yield (higher values of accuracy indices and lower values for t he sum of squared estimation error). In addition, more accurate maps were obtained, especially considering the optimized sample configurations with 188 and 549 sample points.KEYWORDS: accuracy indices, optimization, sampling grids, spatial variability. MAPAS DA PRODUTIVIDADE DA SOJA USANDO CONFIGURAÇÕES AMOSTRAISREGULARES E OTIMIZADAS PELA TÊMPERA SIMULADA RESUMO: Neste trabalho, teve-se o objetivo de estudar e comparar mapas temáticos da produtividade da soja para diferentes grades amostrais, utilizando métodos geoestatísticos (função semivariância e krigagem). A análise foi realizada com dados da produtividade de soja em t ha -1 numa área comercial com grades regulares e distâncias entre pontos de 25x25 m, 50x50 m, 75x75 m e 100x100 m, com 549; 188; 66 e 44 pontos amostrais, respectivamente, e dados obtidos pelo monitor de colheita. Também foram gerados esquemas amostrais otimizados, com o algoritmo chamado Têmpera Simulada, usando a maximização da medida de acurácia exatidão global, como critério de otimização. Foi verificado que fatores como o tamanho da amostra e a densidade amostral influenciaram na descrição da distribuição espacial da produtividade da soja feita por meio dos mapas temáticos. Quando se aumentou o tamanho amostral, houve aumento da eficiência dos mapas temáticos quanto à descrição da variabilidade espacial da produtividade da soja (maiores valores dos índices de acurácia e os menores valores para a soma quadrada do erro de estimação). Além disso, os mapas mais acurados foram obtidos considerando as configurações amostrais otimizadas com 188 e 549 pontos amostrais.PALAVRAS-CHAVE: grades amostrais, índices de acurácia, otimização, variabilidade espacial.Soybean yield maps using regular and optimized sample with different configurations by simulated annealingEng.

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“…Studies have shown the importance of performing Integrated Pest Management (IPM) for the monitoring of pests in many crops, and the introduction of technological innovations can contribute to the elaboration of protocols and to a more efficient and local control, minimizing production costs and the amount of agrochemicals in the environment (Riffel et al, 2012). However, in the soybean cultivation, insecticides have not been used based on the infestation of pest populations, which disrespects the level of control for the crop.…”

Section: Introductionmentioning

confidence: 99%

Defoliation percentage in two soybean cultivars at different growth stages

Glier¹,

Júnior

Fachin

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate the agronomic variables due to the effects of different levels of defoliation in the phenological phases of two soybean cultivars. The experiment was conducted during the 2011/2012 season, in a randomized block design with three replicates, in a 2 x 4 x 5 factorial scheme. Two cultivars were exposed to defoliations of 0, 25, 50, 75 and 100% at the stages of V4, V9, R3 and R5. The cultivar 'NK 7059RR' showed less sensitivity to defoliation than the cultivar 'IN 4990RG' . 25% defoliation levels reduced the yield of the cultivar 'IN 4990RG' , while levels of 75 and 100% reduce the number of grains per pod in both cultivars. The defoliation performed in the V4 stage lead to lower grain yield than defoliation in V9. The most sensitive stages to defoliation are R3 and R5, where there is a greater reduction in the production potential of soybeans.Percentual de desfolha em duas cultivares de soja em diferentes estádios fenológicos R E S U M O Objetivou-se, com este trabalho, avaliar as variáveis agronômicas em função dos efeitos de diferentes níveis de desfolha nas fases fenológicas de duas cultivares de soja. O experimento foi conduzido durante a safra 2011/12 e o delineamento experimental utilizado foi o de blocos casualizados, com três repetições, em esquema fatorial 2 x 4 x 5, ou seja, duas cultivares foram submetidas à desfolha nos estádios V4, V9, R3 e R5 com porcentagens de 0, 25, 50, 75 e 100%. A cultivar 'NK 7059RR' apresentou menor sensibilidade à desfolha do que a cultivar 'NA 4990RG' . Níveis de 25% de desfolha reduziram a produtividade da cultivar 'NA 4990RG' enquanto que níveis de 75 e 100% reduzem o número de grãos por vagem nas duas cultivares. As desfolhas realizadas no estádio V4 acarretam em menor produtividade do que quando realizadas no estádio V9; os estádios mais sensíveis à desfolha são R3 e R5, ocorrendo maior redução no potencial produtivo da soja.

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Densidade amostral aplicada ao monitoramento georreferenciado de lagartas desfolhadoras na cultura da soja

Cited by 16 publications

References 15 publications

Lepidopteran pests associated with the soybean cultivars phenology

Lepidopteran pests associated with the soybean cultivars phenology

Soybean yield maps using regular and optimized sample with different configurations by simulated annealing

Defoliation percentage in two soybean cultivars at different growth stages

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