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So true. Just a question, do you rotate where you plant? I read that if you plant tomatoes in this plot then next season you should plant something different. I guess this lessens the depletion of minerals in the soil. Or do you amend the soil to add back the minerals.

Yes we rotate by row and till every year although next year we're moving the garden closer to the house and water source. My wife also has a test kit and tests the soil every year and we amend if needed.

Good idea, I was rotating by bed and I don't have a very large garden. Rotating by row would likely make a more efficient use of space. I have been using litmus paper to test the soil but I am still lost as to what amends to add. The litmus test (as you probably know) only tells the pH. I don't know how to translate pH level into how much N (nitrogen), P (phosphorus) or K (potassium) to add.