Frankhartx said:

Greetings to all,
This is probably such an elementary question that many of you will laugh =
at my ignorance but I would like some advice concerning tomatoes with =
rotten bottoms. I have heard that this syndrome is caused by uneven =
watering and I have also heard that it is caused by a deficiency of =
calcium in the soil.

It is a metabolic problem of calcium metabolism in the fruit. Plants grown in soils
where calcium is not abundant are prone to this problem. However, even in soils
with very high levels of calcium, blossom end rot can occur due to watering
problems (too much, too little, or grossly uneven). Some varieties are far more
likely to suffer from BER than others.

Go to google.com and search for Blossom End Rot==bear in mind that as the
season advances most BER conditions clear up by themselves so any "cure" is of
questionable value

My situation this year is that BER began to develop *later* in the season. We had
above normal rain early in the season, and much drier and more uneven rainfall
later. The earliest trusses showed no sign of BER; the later fruits are showing
some sign of BER on susceptible varieties. I am glad that the paste tomatoes
were close to ripening when the rainfall turned erratic; last year late spring was
very dry, and BER took out about 1/2 the crop on my early paste tomatoes
(despite supplemental watering).
--
Pat in Plymouth MI

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)