If the NPK  fertilizer called 15 15 15 is in the form of KCL, it is recommended not to  use the NPK compound fertilizer named 15 15 15 as it will harm chlorine  sensitive plants, better to mark it is on MOP (chloride) basis for reminding  purpose.

If there is  Sodium (Na) in irrigation water and with soil (KCL), it comes together with  Chlorine (Cl) and becomes NaCl, which is the formula of salt. Thus, we give  salt to the environment without realizing it. The salt that will form in the  environment will cause drying in plants sensitive to salt as well as reducing  the yield in non-sensitive plants. Since the pH of the plant is 6.5 in  mineral soils and 5.5 in organic soils, the uptake of plant nutrients by  plants should be at the highest level.

NITROGEN

It increases the protein by increasing the amino acid.  Nitrogenous fertilizers cause the plant to lose too much water. Its  deficiency manifests itself in the form of lightening and drying on the  leaves. If there is no nitrogen in the environment, no chlorophyll is formed,  so the leaves will turn yellow. Nitrogen should be applied less frequently.

POTASSIUM

It has an  effect on the formation of organic matter in photosynthesis. There is no need  to give potassium fertilizers in clay soils. Potassium deficiency manifests  itself in old needles and in the advanced stage of deficiency in younger  tissues. Since it is a very mobile fertilizer, it is said that it transmits  the organic matter produced by old leaves to young leaves. Its deficiency  manifests itself inwards from the leaf tip.

It increases  the resistance of the plant to cold by increasing the dry matter content of  the plant. It provides the plant to be resistant to cold by increasing the  duration of the stomata. At the same time, it decreases the water loss of the  plant and increases the bacterial resistance. It is a less mobile fertilizer  than Potassium Nitrogen and more mobile than Phosphorus.

MAGNESIUM

Since it is  a very mobile fertilizer, it is said that it transmits the organic matter  produced by old leaves to young leaves. Its deficiency manifests itself from  the leaf stem upwards and outwards from the middle vein. In conifers,  reddish-brown spots are formed.

CALCIUM

Since it is  a very active fertilizer, it is said that it transmits the organic matter  produced by old leaves to young leaves. Weakness in the plant's peak growth  is a sign of Calcium deficiency. Again, the deficiency makes the leaves turn  yellow. If the color of this yellowing is white, it is a calcium deficiency.

PHOSPHORUS

Its deficiency manifests itself in old  leaves. It takes a purple and purplish color. Phosphorus is mobile at 7 cm.  It is applied 1-2 times at planting or deep-planting. Increases root  development and progeny (flower) amount.

ZINC

Weakness in the plant's peak growth is a sign  of Zinc deficiency.. A yield increase of 54.8% is achieved in the  applications of zinc in agricultural areas where grain is grown. Zinc increases  the resistance of the plant to winter cold. It is an effective fertilizer in  plant growth.

Zinc fertilizer is applied to the soil in the  form of Zinc Sulphate in the spring before the first release, and if it is  not given in the first release, before the second version, it is applied to  the soil with a plow at a depth of 18-22 cm, 3 kilograms per decare (Turkey  Data), and this process is repeated regularly every 3 years. In addition to  these applications to be made from the soil, Zinc Sulphate application should  be made on the foliage by mixing with weed pesticides and nitrogenous  fertilizers in the spring. While zinc sulphate is given with weed pesticide,  adding nitrogen fertilizer both reduces the temporary damage caused by the  herbicide to the plant and enables the nutrients to reach the other organs of  the plant more easily.