Last year, I had pretty good results with the combination I used in my raised beds. I took cues from "Square Foot Gardening" and from my pocketbook. Following is approximately what I used per 4'x12' bed.
- 1 - 50 lb bag Black Kow Compost (Available at Lowes and Home Depot)
- 1 - 20 lb bag Black Hen Compost (Available at Lowes and Home Depot)
- 4 cu ft Peat Moss (You can find these in 4 cf bails at Ace Hardware)
- 6 cu ft Garden Soil for Flowers and Vegetables (Available at Lowes, Home Depot and Ace Hardware)
In the 4'x4' boxes, I ran into problems (blossom end rot and powdery mildew) likely due to overcrowding, a lack of calcium, fluctuating moisture levels, and poor drainage. We have pretty heavy soils that retain water, but we were also hit by drought conditions during which I didn't water enough. This year, I will be planting tomatoes and squash in other areas of the garden to increase air flow and to prevent any recurring diseases that tend to hit tomatoes if planted in the same area repeatedly.
Most likely I will only be adding calcium and Black Kow and Black Hen in the coming weeks. From what I have read, this compost is fairly pH neutral.