Soil acidification

In order not to make the soil alkaline by fertilization, physiologically acidic fertilizers should be used (i.e.. acidifying the soil). Ammonium sulphate is the best of nitrogen fertilizers, with potassium – potassium sulfate. Nitrogen feeding of plants can be done every two weeks while watering them. One tablespoon of ammonium sulphate is then dissolved in ten liters of water. This treatment is used several times during the plant vegetation period.
You can recognize nitrogen deficiency by this, that older plant leaves turn yellow, there is an inhibition of shoot growth, the fruit is more colored, but they mature earlier. The yield is clearly falling.
Magnesium deficiency causes chlorosis (disappearance of chlorophyll), turning into necrosis (dying off of tissue) between the veins of older leaves. The leaves are falling. Boron deficiency is recognized by corking, distortion, and even the cracking of fruit. Symptoms worsen in alkaline soils during drought. Iron deficiency causes chlorosis between the leaf veins, but the nerves stay green. The symptoms are first visible on the leaves of the youngest, which, in extreme cases, may be completely white.

Zinc deficiency is manifested by the formation of small rosettes, stiff leaves at the tips of young shoots. The lower part of the shoot is bare. The bark becomes rough and brittle. The yield drops drastically. Copper deficiency causes, that the shoots turn dark brown, flattened and die.

In the case of symptoms of deficiency of individual components, it is used, apart from soil fertilization, foliar fertilization with salt solutions of the missing elements.