Do you water your tomatoes with clean water? Then don't be surprised that they bear fruit haphazardly.
Scientists have proven that a weak vinegar solution is the key to record harvests.
Add a tablespoon of 9% vinegar to 10 liters of water and water the bushes at the roots. The acid dissolves salts in the soil, opening access to phosphorus and calcium.

In just three days, the tomatoes will begin to grow ovaries, and the ripe fruits will be as sweet as fruit.
But be careful: vinegar water kills earthworms. To avoid this, pour the solution only into the holes, and do not spray it all over the bed.
For greenhouse tomatoes, add a pinch of soda to the mixture - this will neutralize the strong smell.
If the leaves start to curl, reduce the vinegar concentration by half.
The main thing is not to tell experienced gardeners about this method: they will call you a heretic until they see your giant tomatoes.
For cucumbers, the vinegar solution is diluted weaker (1 teaspoon per 10 liters) - otherwise the fruits will become watery. And if you add a drop of iodine to the mixture, you will get a powdery mildew killer.
You can disinfect a greenhouse with vinegar: wipe the walls with a solution (1:4), and the mold will disappear.
But never use essence - it will burn the roots.
And remember: the method only works on alkaline soils. If the soil is acidic, vinegar will kill it.