Lecture 1 Intro and Environment

Question 1

Solving for growing degree days (GDD)

Answer 1

1. Calculate for each day (GDD)
   GDD = ( Tmax - Tmin)/2 -Tbase
   Tbase = The temperature when plant starts to grow

Question 2

Atmosphere

Answer 2

Sea-level pressure: 101.35 kpa
O2: 20.9 % = ~ 21kpa
H2O: 0-5% ~0-5 kpa
CO2: 0.04% ~40Pa ~400ppm

Question 3

Relative Humidity

Answer 3

0-100% is RH of air
100% is saturation were condesation occurs
RH = 100 *ea/esat
ea = actual pressure of H2O vapor
esat = saturation pressure of H2O vapor or maximum pressure of H2O the air can hold
But the way to solve realtive humidity in a room. You find the room temperature and have it at 100 percent temperature and draw the line at which the vapor point and then when you have the temperature make sure its a 100 percent condensation find the vapor pressure