The Prevention of Blossom-end Rot

Soil Acidity

• Maintain the soil pH between 6.0 and 6.5. This range is where plant roots can readily absorb calcium in the soil. Make any required adjustments to soil acidity two to four months prior to planting the crop.

Soil Testing and Fertilization

• Apply supplemental nutrients based on the results of soil testing. Applying too much fertilizer can induce blossom-end rot. Soil test recommendations are the surest way to apply the correct amount and type of fertilizer. Most county extension offices perform these tests for a small fee, or you can buy a test kit at many garden centers.

Irrigation

• Fluctuations in soil moisture are a contributing factor in blossom-end rot. Maintain a watering schedule that supplies about 1.5 inches of water per week during the fruiting period. Turn off automatic irrigation systems during periods of adequate rainfall.

Mulch

• A thick mulch layer conserves moisture in the root zone and reduces the occurrence of blossom-end rot. Any type of mulch will work to prevent the drying of the soil surface by wind or sun.