An R package to quantify different chilling and heat models for temperate fruit trees

Pertille, Rafael Henrique; Sachet, Marcos Robson; Guerrezi, Marieli Teresinha; Citadin, Idémir

doi:10.1016/j.compag.2019.105067

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…Each required use of specific packages: "brt" 58 , "mda" 61 , "MARS" 74 , and "randomForest" 80 . R software was used to perform the modeling, analysis, and graphical depictions of the analyses 81 , 82 .…”

Section: Methodsmentioning

confidence: 99%

Assessing the susceptibility of schools to flood events in Iran

Yousefi

Pourghasemi

Emami

et al. 2020

Sci Rep

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Catastrophic floods cause deaths, injuries, and property damages in communities around the world. The losses can be worse among those who are more vulnerable to exposure and this can be enhanced by communities’ vulnerabilities. People in undeveloped and developing countries, like Iran, are more vulnerable and may be more exposed to flood hazards. In this study we investigate the vulnerabilities of 1622 schools to flood hazard in Chaharmahal and Bakhtiari Province, Iran. We used four machine learning models to produce flood susceptibility maps. The analytic hierarchy process method was enhanced with distance from schools to create a school-focused flood-risk map. The results indicate that 492 rural schools and 147 urban schools are in very high-risk locations. Furthermore, 54% of rural students and 8% of urban students study schools in locations of very high flood risk. The situation should be examined very closely and mitigating actions are urgently needed.

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Section: Methodsmentioning

confidence: 99%

Assessing the susceptibility of schools to flood events in Iran

Yousefi

Pourghasemi

Emami

et al. 2020

Sci Rep

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“…This adaptability allows the user, for example, to set the function GDD_linear() to various base temperatures used in other models, such as 0°C to be compatible with the grapevine flowering veraison (GFV) phenological model (Parker et al, 2013), or 4.5°C or 10°C for applications with "classic" phenological models used, respectively, in many fruit tree species and viticulture. The same occurs for the functions estimating phenology, which support any combination of chill and heat models generated by the functions in fruclimadapt or other R packages like chillR (Luedeling, 2020) or ChillModels (Pertille et al, 2019). Moreover, the package has been designed to ease the evaluation of long climate series, so that there is no limit (other than computing restraints) in the number or years that can be evaluated in a single run of a function.…”

Section: Using Fruclimadaptmentioning

confidence: 99%

fruclimadapt: An R package for climate adaptation assessment of temperate fruit species

Jiménez

Urrestarazu

Santesteban

2021

Computers and Electronics in Agriculture

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“…To quantify and estimate the chill requirement (CR) of temperate fruit species, mathematical models are used that consider optimal temperature ranges or have a trained algorithm to estimate chill units or chill portions (Fishman et al 1987). Several mathematical models are used, depending on the species and evaluation region (Pertille et al 2019). The classical and less complex models, such as the Weinberger model (Weinberger 1950), quantify chilling hours below 7.2 °C.…”

Section: Introductionmentioning

confidence: 99%

“…There are also models adapted to warmer climates, such as the Taiwan (Lu et al 2012), PCU-positive chill units (Linsley-Noakes et al 1994), Dynamic (Fishman et al 1987), North Carolina Modified Model (Ebert et al 1986), and Low Chill (Gilreath and Buchanan, 1981) models, as well as those created for specific species and cultivars, such as the Gala apple and sweet cherry tree 'Sweetheart' (Guak and Neilsen, 2013) models. Most of these models are available in an R language package created by Pertille et al (2019). Although none of these models were validated for Brazilian conditions (Malagi et al 2017), chilling hours below 7.2 °C-the Weinberger model- (Weinberger 1950) and the North Carolina Modified Model (Ebert et al 1986) have been used in apple-producing areas in Brazil (Carvalho et al 2014).…”

Section: Introductionmentioning

confidence: 99%

High-chilling requirement apple cultivar has more accentuated acrotony than low-chilling one in mild winter region

Pertille

Citadin

Patto

et al. 2021

Trees

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Key message This study contributed to the understanding of acrotony in apple cultivars in a mild winter region, contrasting high-and low-chilling requirement apple cultivars, and the role of this behavior in plant adaptability. Abstract When there is insufficient chilling accumulation during the cold season, apple trees present erratic and poor budbreak. However, there is a lack of information regarding carbohydrate metabolism and their influence on budbreak and branch architecture in apples grown in subtropical humid climates. This work aimed to evaluate budbreak and the availability of carbohydrates in distal and proximal portions of 1-year-old apple tree shoots, and to verify their relationships with axillary shoot formation in spring. Two apple cultivars 'Eva' and 'Fuji', with low and high chilling requirements, respectively, were assessed in a mild winter region of Brazil. From April to October of 2012, 2013 and 2014, 25 one-year-old shoots of each cultivar were sampled bi-weekly. These shoots were divided into distal and proximal portions. Wood from five shoots was sampled to quantify the nonstructural carbohydrate and alpha-amylase content for each portion. The single-node cutting test was used to observe mean time to budburst for the remaining 20 shoots. In generally, our results suggest that under mild winter conditions, the apple tree does not enter into deep endodormancy. Furthermore, there were biological and biochemical differences between the distal and proximal portions of the bearing-shoots for all the studied variables, likely related to the higher sink force in the distal portion. Consequently, the buds from the distal portion sprout first, thereby establishing a primigenic dominance over the buds of the proximal portion. Our study also suggests that the shallow endodormancy of high chilling requirement cultivars cultivated in mild winter regions would make paradormancy predominant, emphasizing acrotonic branching in these cultivars. There was greater availability of nonstructural carbohydrates and alpha-amylase activity in the wood of the distal portion of 1-year-bearing shoots of apple trees under mild winter conditions, regardless of the cultivar.

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An R package to quantify different chilling and heat models for temperate fruit trees

Cited by 10 publications

References 18 publications

Assessing the susceptibility of schools to flood events in Iran

Assessing the susceptibility of schools to flood events in Iran

fruclimadapt: An R package for climate adaptation assessment of temperate fruit species

High-chilling requirement apple cultivar has more accentuated acrotony than low-chilling one in mild winter region

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