Apply potassium, phosphorus, and magnesium as recommended because balancing these nutrients with calcium is also important in preventing blossom-end rot. Mix in well and plant. Don't over fertilize tomatoes when planting them. Mulch plants to conserve moisture and to provide a more uniform water supply. Straw, pine straw, ground leaves, or newspapers are all good mulches.
Mulches conserve and maintain a uniform moisture supply, thereby helping to reduce blossom-end rot.
Under drought conditions, plastic mulch may overheat the soil and increase blossom-end rot if plants are not watered properly. Adequate soil moisture throughout the season through mulching and water management is essential for avoiding the disorder. Avoid cultivation and hoeing. If cultivation is necessary, it should be shallow to avoid root pruning. Avoid severe pruning.