Preparing the Soil:
Remove any weeds, rocks or debris from the planting area.
Dig the soil to a depth of 6 to 8 inches, breaking up any clumps of dirt.
Add organic matter to the soil, such as compost or aged manure. Work it into the top 4 to 6 inches of soil.
Fertilizing:
Conduct a soil test to determine the pH level and nutrient content of the soil.
Amend the soil based on the test results. For spinach, the ideal pH range is between 6.0 and 7.0.
Add a balanced fertilizer, such as a 10-10-10 or 5-5-5 formula, before planting.
Apply a nitrogen-rich fertilizer, such as fish emulsion or blood meal, every 2 to 3 weeks during the growing season to promote leafy growth.
Managing Soil Fertility:
Mulch around the plants with organic material, such as straw or shredded leaves, to help retain moisture and nutrients in the soil.
Water the plants deeply and regularly, especially during hot, dry weather.
Rotate crops every year to prevent the buildup of soil-borne diseases and pests.
Incorporate cover crops, such as clover or rye, into the soil after the spinach harvest to add organic matter and fix nitrogen in the soil.