Growing Tomatoes

Principle: Try to find out something useful to grow tomatoes. Please notice that it is necessary to have "reference set" for comparison if you want to prove something is useful to tomatoes. And the set on experiment and the set for reference should only have one difference that is the point you want to prove.  Usually, growing tomatoes need to notice blossom-end rot, adding calcium and magnesium, and pinching. Blossom-end rot  can be prevented by keeping the plant evenly moist; calcium can be obtained from crushed egg shells ( plants deficient in calcium are prone to diseases ); magnesium could be obtained via "natural salt" from sea water or Epsom salt.