Ajuste do modelo fototérmico de estimativa do desenvolvimento e do índice de área foliar de soja

Toledo, Neila T.; Müller, Artur Gustavo; Berto, Jorge Luiz; Mallmann, Carise E. S.

doi:10.1590/s1415-43662010000300008

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…however, the final number of nodes of the TEC-5718IPRO cultivar in all sowing times presented no difference due to its determined growth habit (Table 6). In the third sowing time, BMX-VelozRR presented the lowest number of nodes among the cultivars that had indeterminate growth habit, in the presence of weeds (Table 6) The sensitivity to photoperiod of soybean varies according to the cultivar; each cultivar needs a specific accumulated photothermal index for its vegetative and reproductive stages (Toledo et al, 2010). Late-maturing cultivars require a higher degree-day accumulation than early-maturing cultivars.…”

Section: Resultsmentioning

confidence: 99%

Weed incidence and sowing time affect soybean development

et al. 2018

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Despite the economic importance of the effects of weeds on the plastochron and emission of nodes of soybean plants, it has not been studied in detail. The aim of this study was to provide information about the effects of weeds on the development of soybean plants by determining the plastochron and number of nodes of soybean plants of different cultivars sown at different times in soils with presence and absence of weeds. A field study was conducted during the 2013/2014 crop season including a phytosociological survey to identify the occurring weeds, and the determination of the plastochron and final number of nodes of soybean plants. Four botanical families of weeds were found infesting the soybean crops. The plastochron and final number of nodes of soybean were influenced by the cultivar, sowing time, and presence of weeds. The plastochron was higher when the plants were grown in the presence weeds due to the higher relative frequency, relative density, relative abundance, and importance value index of the Euphorbia heterophyla, Ipomoea purpurea, and Urochloa plantaginea species, which resulted in a slower development of the soybean plants, and lower number of nodes per plant.

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Section: Resultsmentioning

confidence: 99%

Weed incidence and sowing time affect soybean development

et al. 2018

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“…Due to the oval shape of the leaves, 30% of the found value was subtracted, and they were then individually weighed to obtain the specific leaf area index, expressed in square centimeters per gram (cm 2 /g), and transformed into square meters per kilogram (m 2 /kg). Subsequently, with the collection of all the plant leaves, the total dry matter weight of the leaves was weighed, and the leaf area index was estimated using the equation 54 .…”

Section: Methodsmentioning

confidence: 99%

The use of photosynthetic pigments and SPAD can help in the selection of bean genotypes under fertilization organic and mineral

Carreño Siqueira,

Marques,

Silva

et al. 2023

Sci Rep

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The common bean is cultivated in all regions of the country, representing a product of great economic and social importance. In order to ensure food security in the world, it is necessary to create alternatives to reduce the dependence on fertilizers and seeds, and in this context, organic agriculture is a sustainable alternative to ensure it. Therefore, it becomes necessary to adapt rapid methods to monitor plant nutrition in real-time. The reflectance index determined by SPAD and pigment determination can be a sustainable alternative to identify genotypes in different fertilizations (organic × mineral fertilizer). The research hypothesis is to monitor nutritional management through pigment levels and reflectance index in common bean cultivars and their adaptation into different types of fertilization (organic × mineral fertilizer). Therefore, the objective of the research was to evaluate the common bean genotypes of the type carioca, in different fertilizations (organic × mineral fertilizer), and their effects on photosynthetic pigments, and the relationship between SPAD reflectance index and productivity. The experimental design used was a 2 × 7 factorial in randomized blocks with four replications: The first factor was the fertilization (organic × mineral fertilizer)and the second were the 7 genotypes (UFU-1; UFU-2; UFU-3; UFU-4; UFU-5; UFU-6 UFU-7), with UFU-1 being a hybrid obtained between genotypes UFU-4 and UFU-7; UFU-2 and UFU-3 were commercial genotypes; and UFU-4, UFU-5, UFU-6 and UFU-7 were genotypes from the UFU germplasm bank, located in the city of Monte Carmelo, Brazil. Evaluations were carried out for the agronomic characteristics of the plants, which were: height, number of branches, length and volume of roots, dry matter, leaf area index, number of flowers, number of pods, number of seeds per pod, 100 seed weight, and productivity of the genotypes. The results were compared with chlorophyll content and SPAD reflectance index, and the genotypes showed distinct behavior for each fertilization (organic × mineral fertilizer). The genotypes recommended for the organic fertilizer were UFU-2, UFU-6, and UFU-7, which showed higher productivity. For themineral fertilizer, the best-adapted genotype was UFU-4, with a higher productive yield. In conclusion, we can affirm that the highest chlorophyll and SPAD indices can help select common bean genotypes with higher productivity and adaptation within the organic fertilizer being this the main focus of this research. However, the other variables carried out during this research also demonstrated to have significant effects, so they could be analyzed individually and could offer valuable information in the selection of the best-adapted genotypes.

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“…However, Tec 78 cultivar, which has a late cycle, had positive correlation for these characteristics. Photoperiodic sensitivity varies according to soybean genotypes, and each cultivar has specific photothermal index accumulation needs to reach a certain vegetative/reproductive stage (Toledo et al, 2010). In the case of long cycle crops, higher degree-days accumulation is needed compared to early maturing cultivars.…”

Section: Figure 2 -Interactions Between Soybean Cultivars and Sowing mentioning

confidence: 99%

Soybean morphological and productive characteristics influenced by meteorological parameters and sowing dates

Schwerz¹,

Caron²,

Elli³

et al. 2016

Científica

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The aim of this study was to evaluate the influence of meteorological elements on soybean morphological and productive characteristics in five sowing dates. The randomized block design was used in a 5x5 factorial, with the following five sowing dates during the year 2013: the first (10-15), second (10-30), third (11-15), fourth (30-11) and fifth (12)(13)(14)(15) 2013), and the following five soybean cultivars: BMX Alvo RR, BMX Veloz RR, CCGL Tec 5721 IPRO, BMX Tornado RR and CCGL Tec 7849 IPRO, with three repetitions. Total dry biomass, leaf area index, plant height, number of pods per plant, number of grains per plant, 1000-grain weight and yield were assessed. According to analysis of variance, significant difference was found for all variables in the cultivar x sowing date interaction. Soybean cultivars morphological and productive characteristics were influenced by meteorological elements and sowing dates. Leaf area index and total dry biomass had the highest means in 11-15 and 11-30, coinciding with the highest grain yield means, obtained for Veloz and Tornado cultivars, respectively. These results were obtained because these sowing dates had the best conditions, with air temperatures between 13.4 and 34.2 °C, accumulated solar radiation of 3074.009 MJ m -2 , accumulated thermal time of 1959.15 °C days and total rainfall of 732.8 mm.Additional keywords: Glycine max L.; leaf area index; solar radiation; thermal time; yield. ResumoO objetivo deste trabalho foi avaliar a influência dos elementos meteorológicos sobre as características morfológicas e produtivas da soja em cinco épocas de semeadura. O delineamento utilizado foi o de blocos ao acaso, em esquema fatorial 5x5, com cinco épocas de semeadura: primeira (15-10), segunda (30-10), terceira (15-11), quarta (30-11) e quinta (15-12 de 2013) e cinco cultivares de soja: BMX Alvo RR, BMX Veloz RR, CCGL Tec 5721 IPRO, BMX Tornado RR e CCGL Tec 7849 IPRO, com três repetições. Avaliaram-se a biomassa seca total, o índice de área foliar, a altura de plantas, o número de vagens por planta, o número de grãos por planta, a massa de mil grãos e a produtividade. De acordo com a análise de variância, constatou-se diferença significativa para todas as variáveis analisadas na interação cultivar x época de semeadura. As características morfológicas e produtivas das cultivares de soja são influenciadas pelos elementos meteorológicos e pela época de semeadura. O índice de área foliar e a biomassa seca total apresentam as maiores médias na época de semeadura do dia 15-11 e 30-11, coincidindo com as maiores médias de produtividade de grãos obtidas para as cultivares Veloz e Tornado, respectivamente. Tais resultados foram obtidos devido a esta época de semeadura apresentar as melhores condições, sendo a temperatura do ar entre 13,4 e 34,2°C, a radiação solar incidente acumulada de 3.074,009 MJ m -2 , a soma térmica acumulada de 1.959,15 °C dias e precipitação pluviométrica total de 732,8 mm.Palavras-chave adicionais: Glycine max L.; índice de área foliar; produtividade;...

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Ajuste do modelo fototérmico de estimativa do desenvolvimento e do índice de área foliar de soja

Cited by 6 publications

References 5 publications

Weed incidence and sowing time affect soybean development

Weed incidence and sowing time affect soybean development

The use of photosynthetic pigments and SPAD can help in the selection of bean genotypes under fertilization organic and mineral

Soybean morphological and productive characteristics influenced by meteorological parameters and sowing dates

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