Conclusively, Grains per Pound gained its currentdefinition in 1959. These days it is a wholly inflexible and accurate measure. The International Yard and Pound agreement standardized it at its current rate:
As mentioned, know GPP can help you optimize the growth environment.
How we can understand GPP?
The answer is"Psychrometrics Chart", which presents physical and thermal properties of moist air. If you understand Psychrometrics Chart, you can easily understand GPP and optimize humidity and temperature for your grow rooms.
The first figure at the beginning of the article is the Psychrometrics Chart. We will also teach you how to read and draw a Psychrometrics Chart later in this article.
Above all, let us be clear, why we need to understand GPP, especially for growing cannabis.
4 Reasons to Know the GPP
Grains Per Pound (GPP) measures the actual moisture in the air, an accurate GPP measurement allows growers to gauge the actual indoor humidity of a grow room.
It allows growers to know the exact amount of moisture in their grow rooms, and helps them to choose the right equipment at different stages.
5 illustrations can conclude GGP's role in cannabis growing.
1. Visualize Environmental Control
Such as why heated air can hold more moisture or, conversely, how allowing moist air to cool will result in condensation.