The conditioning recipe copied from your link
Straw bale gardening
Wheat oats rye or barley straw - not hay
First lay down galvanized wire bird netting. Lay bales on top string side out and cut ends up (OR THE OTHER WAY W/Plastic twine so water doesn't run through)
Conditioning recipe (or start 6 months B4 w/o fertilizer)
Day 1 Sprinkle 1/2 cup per bale Ammonium nitrate (AN)(34nitrogen-0phosphorus-0potassium) fertilizer then water, water, water until it runs out the bottom
Day 2, water
Day 3, 1/2 cup AN and more water
Day 4, water
Day 5, 1/2 cup AN and more water
Day 6, water
Days 7-9 1/4 cup AN and more water
Day 10, 1 cup 10-10-10 per bale and more water
Keep watered 2/day if necessary. Soaker hose over top