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Nutrition","monthly_downloads":205,"total_dependent_repos":0,"total_dependent_packages":0,"readme":"---\ntitle: \"README.md\"\noutput: github_document\n---\n\n```{r setup, include=FALSE}\nknitr::opts_chunk$set(echo = TRUE)\n```\n\n# seedr\n\n![](seeds.png)\n\n\u003c!-- badges: start --\u003e\n[![Travis build status](https://travis-ci.org/efernandezpascual/seedr.svg?branch=master)](https://travis-ci.com/efernandezpascual/seedr)\n\u003c!-- badges: end --\u003e\n\n\n## Overview\n\n`seedr` is an R package that provides functions to fit hydro and thermal time germination models. These models characterize seed lots by two sets of parameters: (i) the physiological thresholds (water, temperature) between which the seed lot can germinate, and (ii) the physiological-time units that the seed lot needs to accumulate before it can germinate. `seedr` fits the hydro time model of Bradford (Gummerson 1986, Bradford 1990, Bewley et al. 2013) and the thermal time model of Garcia-Huidobro (Garcia-Huidobro et al. 1982, Gummerson 1986, Bewley et al. 2013). It allows to fit models to grouped datasets, i.e. datasets containing multiple species, seedlots or experiments.\n\n## Installation\n\n```{r eval=FALSE}\n# Install stable version from CRAN\ninstall.packages(\"seedr\")\n\n# Install last development version from GitHub\ninstall.packages(\"devtools\") # Install devtools if you don't have it\ndevtools::install_github(\"efernandezpascual/seedr\") # Get seedr from GitHub\n```\n\n## Usage\n\n```{r }\nlibrary(seedr)\n# seedr relies on physiotime(), a wrapper function that formats your data and fits a hydro/thermal time model\nphysiotime(grasses, # germination dataset\n           x = \"psi\", # experimental treatment\n           method = \"bradford\", # hydrotime model\n           groups = c(\"species\")) # group dataset by species\n```\n\n\n```{r eval=FALSE}\n# for more information read the seedr vignette\nvignette(\"seedr\")\n```\n\n## References\n\n* Bewley, J. D., Bradford, K. J., Hilhorst, H. W., \u0026 Nonogaki, H. (2013). Environmental Control of Germination. In *Seeds: Physiology of Development, Germination and Dormancy, 3rd Edition* (pp. 302-317). Springer, New York, NY.\n* Bradford, K. J. (1990). A water relations analysis of seed germination rates. *Plant Physiology*, 94(2), 840-849.\n* Garcia-Huidobro, J., Monteith, J. L., \u0026 Squire, G. R. (1982). Time, temperature and germination of pearl millet (*Pennisetum typhoides* S. \u0026 H.) I. Constant temperature. *Journal of Experimental Botany*, 33(2), 288-296.\n* Gummerson, R. J. (1986). The effect of constant temperatures and osmotic potentials on the germination of sugar beet. *Journal of Experimental Botany*, 37(6), 729-741.\n","funding_links":[],"readme_doi_urls":[],"works":{},"citation_counts":{},"total_citations":0,"keywords_from_contributors":[],"project_url":"https://ost.ecosyste.ms/api/v1/projects/20814","html_url":"https://ost.ecosyste.ms/projects/20814"}