Speaker Deck

Concerning light at different locations

by Micah Woods

Published March 7, 2016 in Science

I spoke about photosynthetically active radiation and explained the meaning, and usual values, of photosynthetically active radiation (PAR), photosynthetic photon flux density (PPFD), and daily light integral (DLI). I explained that PAR can be estimated for any location, given latitude and day of the year, for a clear day with no clouds. At the field day on March 8, I further explained how different intensities of cloud cover tend to affect the PPFD. Similar calculations of solar radiation allow one to estimate the evapotranspiration for a site, again given the date and the latitude, and I demonstrated this ET calculator that uses the Hargreaves equation: https://asianturfgrass.shinyapps.io/ET_calculator/.