Answer: Since the soil is lacking nitrogen and potassium, I'd recommend adding these nutrients before you plant this spring. Start by adding a 3- to 4-inch layer of composted manure over the whole garden and work this material into the soil to a depth of 6 inches. To correct the potassium deficiency, add greensand to build a reservoir of the nutrient in the soil, and use muriate of potash to provide potassium to your plants quickly. Both should be available from garden centers in your area.
To supply extra nitrogen, water the plants with a fish emulsion solution and apply cottonseed meal or soybean meal at planting. Sidedress monthly with the cottonseed meal or soybean meal. Again, both should be available locally at feed store or even pet supply centers. Here's to a hearty harvest!
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