Organic Fertilizer for Carrots

Nutrient and Soil Requirements

• Young, developing carrots need proper supplies of nitrogen, phosphorus and potassium for healthy growth. The Utah State University Extension advises using a nitrogen-based fertilizer to promote rapid carrot plant growth and root development. Carrots also grow best in a soil rich in decomposed organic matter. Soil should also be well-drained with a pH between 5.5 and 7.0.

Organic Options

• Manure and any composted matter used as fertilizer should be well-composted to avoid forked and split root problems. If using manure, an analysis is recommended for a complete nutrient value profile. For carrots, Mother Earth News recommends an organic fertilizer containing kelp meal, bone meal, rock phosphate, guano, dolomitic lime, gypsum, agricultural lime and seed meal, along with a 1/4-inch layer of steer manure or finished compost.

Signs of Nutrient Imbalance

• A lack of nitrogen will affect root color as a result of decreased carotene synthesis. Too much nitrogen in the soil will delay root development while causing excessive top growth, as well as hindering uptake of magnesium.