What is the target daily MC reduction rate when Air drying, Shed drying, or otherwise DH drying Yellow Poplar from Green to 20% MC?
First, I have researched (searched online) and read several of the USDA publications and will specifically reference FPL-GTR-117. Noteworthy, the 117 pub is a bit inconsistent.
Pub 117 References:
P. 2 Table 1 list green yellow-poplar at 83 to 106 MC. Let's use 95% MC for simplicity.
P. 24 Table 7 shows an air drying day range of 1" poplar to 20% MC from 40 days to 150 days...depending on environmental conditions. At the 40 day time, the daily MC reduction rate is less than 2%
P 25, Table 8 has similar times, but adds the 50mm thickness. again 40 days is the lowest time for 1" thickness.
P26, Table 9 it shows cases in Roanoke, VA where the lowest days is 14 or 15. Doing the math: from 95% (green) to 20% or 75%MC loss in 14 days is greater than 5% MC loss per day.
I assume no degrade from the listed references in Pub 117 and only limited by environmental factors (temp / humidity).
So what is the Maximum (conservative) MC loss per day of low temperature (70 degrees F) drying green yellow poplar to 20% without any degrade?
Any data out there or industry standards for Yellow-Poplar for the following thicknesses?
4/4
5/4
8/4
12/4
Thanks in advance,
George