Incidence of blossom-end rot is also increased where there is a low ratio of calcium to certain other nutrients such as potassium and nitrogen. Although the most desirable calcium levels for preventing blossom-end rot have not been determined, the application of lime to fields known to be low in calcium has helped to prevent the disease. Calcium chloride solutions are also available under several trade names for small scale garden use. This helps to rapidly place calcium directly where it is needed in the fruits. Do not exceed the recommended rate.
Calcium chloride is suggested only for tomatoes.
Since blossom-end rot is so closely related to extremes in the water supply, an important aid in control is to regulate moisture supply in the soil. Cultivation and hoeing can be avoided if proper weed-control chemicals are used. If cultivation is necessary, it should be shallow to avoid root pruning. Mulching, which serves to maintain an even supply of soil moisture, should be practiced where feasible. If irrigation of any kind can be used, it may prove profitable during hot, dry weather.