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Having too high a nitrogenHaving too high a nitrogen content in the soil is the classic issue with radish growing. The most common organic sources of phosphorus include steamed bone meal, rock phosphate, and horse, cattle, or poultry manure. Just keep in mind that natural fertilizers provide relatively low amounts of nutrients, as compared to commercial fertilizer so it's more important to have the right soil from the start. If you use fertilizer, work in about 10 to 15 pounds of 5-10-5 per 1,000 square feet of garden.

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