why do tomatoes get black spots on the bottom

What is Blossom End Rot? If your tomatoes look black on the bottoms, they re probably suffering from blossom end rot. Blossom end rot can be identified by a black or dark discoloration, usually with a water-soaked appearance. It can also appear on peppers and eggplant. The good news is that it s not a disease, but rather the result of a calcium deficiency when the fruit was forming. Particularly in container gardening, the calcium deficiency that causes blossom end rot is often caused by inconsistent watering. If the soil gets too dry, the plant isn t getting the calcium it needs in order to produce healthy fruit. If the plant gets too much moisture, the same thing can happen. Blossom end rot can also be the result of over-fertilization during early fruiting. Blossom end rot sometimes occurs inP which have very consistent supplies of water and just the right amount of and dolomite, which should provide all the calcium the plants need.

In an Earthbox, blossom end rot might be the result of unusually rapid growththe plant can t take in enough calcium quickly enough. The good news is that if you growing indeterminate tomatoes (that set fruit all season) and you have a few tomatoes with blossom end rot, it doesn t mean that all your tomatoes will be affected. Even without treatment, some of your later season tomatoes may be fine. P
Don t plant tomatoes in cold soil, Don t over-fertilize, especially with high nitrogen fertilizer, Don t under-fertilize. Tomatoes are heavy feeders and potting soil, unless it is pre-fertilized, doesn t provide the nutrients tomatoes need. Use high-quality potting soil that drains well. Don t let your tomato plants dry out. Keep the soil moist, not wet Add dolomite or lime to potting soil when planting. Some people say that adding crushed egg shells and watering with diluted milk or yogurt can add calcium and prevent blossom end rot.

If you experience blossom end rot in aP, mix 1/4 cup of lime with one gallon of water and pour it into the reservoir. Only do this once. This should fix the problem. Blossom end rot is caused by a calcium deficiency. This leaves soft tissue that often is infected by fungal spores, often resulting of total loss of that particular fruit. End rot is a totally physiological condition occuring most often in the early fruit. Mostly due to calcium deficiency but can also occur because plant has been hardened to fast, weather conditions are cooler during early growth (sometimes in late cooler summers). "If your calcium is off add limestone (for acid soils with a pH below 6), or gypsum when the soil pH is in the 6 to 7 range. If calcium levels are okay, the next most important control is to maintain optimum soil moisture.

When tomatoes experience the slightest bit of drought, BER may result. Using mulches will usually significantly decrease BER as excessive evaporation from soil is reduced. If growing on bare ground, avoid cultivating too close to plants to prevent root damage and the need to maintain deep root development. Varieties will vary in their susceptibility so if you have a problem with a particular variety, choose a new one next year. When side-dressing plants, using a nitrate type fertilizer like calcium nitrate is preferable to ammonium based ones like urea. Finally, don't bother to use calcium sprays. They are worthless in combating the problem. The same problem can occur on pepper and eggplant. " As per Thomas A. Zitter, Professor, Department of Plant Pathology, Cornell University, Ithaca, NY, and Steve Reiners, Associate Professor, Horticultural Sciences, NYSAES, Geneva, NY

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