Here is a list of sources I've encountered to date:
Castle: 0%, 5%, 8%, 12%, 25% dependent on castle type
Roads: 0%, 2%, 5%, 10% dependent on road type
Encampment: 10% for all types except Barracks, which gives 20%
Heaven and Earth: 5%
Commissioner of Supply: 1% to 6%, equal to the appointed general's level
Inspirational skill: 0%, 5%, 10% bonus to the whole province dependent on the skill level. I don't think multiple generals can stack this bonus, but my other general with this skill died recently, and since I play legendary I can't go back to verify this again.
Surgeon retainer: 5% to units under the general's command.
Assuming generals can't stack their bonuses, the maximum would therefore be +81% (!) in the form of: 25% (Citadel) + 10% (Imperial Roads and Towers) + 20% (Barracks) + 5% (Heaven and Earth) + 6% (Level 6 Commissioner of Supply) + 10% (1 Inspirational 3 General) + 5% (Surgeon)
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