T4 T4

where f is the cloudiness factor (), e' is the net emissivity of the surface (), a is the Stefan-Boltzmann constant = 4.90 x 10-9 MJ m-2 K-4 day-1, and Tkx and Tk„ are, respectively, the maximum and minimum daily air temperatures (K).

The cloudiness factor f represents the ratio between actual net long-wave radiation and the net long-wave radiation for a clear-sky day and is computed as

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

Get My Free Ebook

Post a comment