How Much Fruit Do Satsuma Trees Produce My Six Year Old Satsuma Mandarin Tree Has Never Produced Much Fruit. Now It Is Producing Sour Blood Oranges!?

My six year old Satsuma Mandarin tree has never produced much fruit. Now it is producing sour blood oranges!? - how much fruit do satsuma trees produce

This year it was laden with flowers, then fruit. Unfortunately, the fruits of small oranges. They have very red meat and not sweet. What? If the fruit from the rhizome? This tree is in the middle of a navel orange and Meyer lemon.