shade

The PPFD (photosynthetic photon flux density) every 5 minutes for a day, week, month, and year at Corvallis looks like this. I’m not so interested in the PPFD when the temperatures are too cold or too hot for photosynthesis.

Photosynthetically active radiation (PAR) provides the energy for plants to grow. Unlike temperature or precipitation data, which are readily available, it is less common to see the numbers or charts for PAR.

I’ve gathered some collections of tweets into moments for easy viewing in sequence. I previously arranged these on Storify, but that service has shut down. Here’s a quick description of these moments.

That’s what Jon Scott wrote to me on October 7, 2014, after I shared the slides from my shade talk at the Northwest Turfgrass Association conference. We’ve been having a back and forth about this ever since.