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I believe it is called Blossom End Rot (BER) and is caused by a lack of Calcium. It can be due to either shallow or insufficient watering, or a deficiency of Calcium in the soil. The recommendation seems to be using a layer of mulch to prevent premature drying of your soil after watering, or, if you test your soil and it is Calcium deficient you can add either limestone (if the soil's acidity level or pH is below 6.0) or gypsum.

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15y ago
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15y ago

Calcium deficieny. do not use liquid fertilizer. go to local nursery and they will be able to get you a bag or spray that will help the problem about $5-$8. It will not get rid of tomatos already like this, but will save the others from this. As stated above its a calcium defienciency. If you add lime to the soil it will stop blossom end rot. If you don't want to use lime, you can add two Tums with calcium next to the seedling when you first plant the tomato. Egg shells are reported to add calcium to the soil, but the composting time isn't worth the wait as it takes years for the calcium to leech into the soil.

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17y ago

I suspect that there could be several reasons, but the one I've heard most often, including from our local Agriculteral Extention agent, is too much watering during high heat conditions.

In particular, the problem occurs with uneven watering. If you don't water them much for a while, and then give them a lot, they can split. Sometimes this can occur if unseasonal rain falls during the normally dry growing season.

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16y ago

Blossom end rot will cause this symptom. It is due to a variety of factors, all of which affect the plant's ability to absorb calcium. These conditions include:

* too much or too little water (increase organic content of soil apart from monitoring the soil moisture level)

* poor drainage (add gypsum)

* over-fertilizing

* saline soils (avoid over-fertilizing and water thoroughly to leach salt)

* acidic soils (add lime)

Also consider applying one of the calcium sprays.

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15y ago

This is tomato blossom end rot due to calcium deficiency in the developing fruit. Particularly in pots, it is almost always a result of uneven watering and a resulting deficiency in calcium uptake, not inadequate calcium in the soil or potting medium. The fruit is still good to eat (just cut off the bottom) and correcting the watering problem will result in future fruit being fine.

Go here for more information: http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=1076

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12y ago

When you buy it and dont eat it for a while it will eventually rot

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Q: What causes tomato rot on the bottom?
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Will a tomato rot faster in warm water or cold water?

The tomato would rot faster in warm water because, when you put a tomato in cold temperature ex: refrigerator the tomato does not rot and it stays good for a long period of time, now if you put the tomato in warm temperature or room temperature for instance, the tomato has more chance of rotting than in cold temperature so the tomato rots faster in warm water.


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