6 Tips for Building Soil for Your Raised Garden Beds and Planters | Eartheasy Blog:
Bringing in some manure is a great start in preparing your beds for a new year of gardening.
But a truckload sounds like a lot for a 16 x 8 bed. I would think a couple of wheelbarrow loads would suffice. Till the manure in several weeks before planting to let it mellow. (Well aged manure is preferable to fresh manure.)It is likely that your soil has compressed a few inches since last year. If it is not light and fluffy, you should add some peat. We usually add lime at the same time as peat, since peat is acidic. (If you had planted green manure then you may not need to add peat.)
Phosphorus is another essential soil ingredient that needs replenishing each year or two. We use rock phosphate for this. You can also add bonemeal. Wood ash is also good to use if this is available to you.
This time of year we focus on developing the soil.
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