What unit should I use for soil moisture?
cb (centibar) or cp (centipoise)
And what is the unit for Leaf wetness?
(BTW, If this is not the right place for this subject, feel free to move it to the right place)
I see this has been answered satisfactorily on the wxforum
(I was surprised you put the same question here without giving enough time to get an answer on Wxforum (patience is a virtue))
With soil you would use cb. Leaf Wetness has no units that I know of. You could google it and look. The only thing I found was a particular reading and the time it stayed at that level.
You can ask me for an answer any time. I try to check my mail very early in the morning or after I am home in the early evening.
Hey Lars,
I use cb too.
Thanks for your answers, I will stick to cb.
@Brian, I am sorry if I seems pushy, but I just want to get everything right (and patience is not one of my strengths :oops:)
I will keep that in mind, thanks
One more question about soil moisture.
What is high and what is low?
0-10 Saturated Soil. Occurs for a day or two after irrigation
10-20 Soil is adequately wet (except coarse sands which are drying out at this range)
30-60 Usual range to irrigate or water (except heavy clay soils).
60-100 Usual range to irrigate heavy clay soils
100-200 Soil is becoming dangerously dry for maximum production. Proceed with caution.
it is the opposite of what you think. 0 would be the high and 200 the low.
One other interesting thing… the ground here is frozen 4 inches down, so the reading is 200 when the ground freezes.
Here is the URL for my soil sensor page for you to get a sense of what you are working with:
http://www.weatheraardvark.com/Soil.htm
Good simple explanation:
“Soil water tension is usually measured in centibars, where a centibar is 1/100th of a bar, and a bar is roughly equivalent to one atmosphere of pressure. Centibars measure the force that a plant must exert to extract water from the soil. As the plant works harder to remove water, the centibar number increases. So larger centibar numbers mean drier soil.”
From http://attra.ncat.org/attra-pub/soil_moisture.html (more goood info there too).
And that’s how plants get bigger.
This is great, thanks to all of you for the good explanations.
And once again, sorry to be a PITA some time.
I just put Viagra on my limp tomato plants… does wonders.