it depends on many things as geometric mean diameter of particles, pellet die geometry, material feeding rate, etc. If you want to produce it first you should try with dry material first and increase the moisture content controlly. While you provide best conditions to produce pellets you will reach optimum m.c. and temp. otherwise it can not be produced. Lower temp. not enough for stick particles and it may cause high energy consumption.. Higher temp. may cause stuck in die holes, or pellets may burn in die holes.. For better understand of optimum parameters of pelletizing, experimental production is best way.. In studies, researchers reported their conditions for pelletizing process. You can see the differences that i mentioned. I remember a publication about corn stover that made by Dr. Tumuluru.

I think thaat t is depending on the genotypes that using in research as well as depending on the rijoin or the area that you grow on it especially the temperture that effect the moisture in the soil.

Check out this material: Article Pelletizing properties of corn stalk rind

Around 12 percent moisture, 15 0C room temperature with 35 percent relative humidity is optimum for corn stover pellets production.