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About fertilizers
Fertilizer Complex

NPK is the usual term for a fertilizer that contains the 3 nutrient elements, namely nitrogen (N), phosphorus (P) and potassium (K).
These fertilizers can have a great variety of chemical formulas, considering the active substance content of the 3 elements and it can be specially manufactured for the specific needs of the crops.
There are also complex fertilizers containing only 2 nutrients, such as NK, NP,PK. Some types of NPK in addition to the 3 essential elements can contain micronutrients.

Phosphorus (P)

Phosphorus is important for the development of plant roots and in the process of baking. Phosphorus intake is essential in the early stages of plant development. Phosphorus is present in all the cells of the plant, which explains its importance in plant metabolism.

The advantages of phosphorus presence:
- ensure the structure of roots and plant growth;
- shorten the maturity of the plant;
- contribute at the increasing of quality of production;
- prevent shaking the grains;
- ensure the increasing of productivity;
- help increase plant resistance to drought and disease;
- ensure grain growth.

The deficiency in phosphorus is expressed by the following phenomena:
- the plants remain dwarf-branches and leaves will not develop;
- strain will be low - the development of roots and support stems of the plant will be blocked;
- the leaves of the plant will have a green dirty colour or reddish and generally will fall;
- at the fruit trees, the development of worms will be stimulated, efflorescence and bud growth will be slowed;
Without enough phosphorus root system is poorly developed and the maturation of the plant and baking will be seriously delayed.
Phosphorus content of fertilizers is expressed in percent P2O5.


Potassium (K)

Potassium is essential at the development of the plants, it can be found in all cells and tissues of living plants in growth areas and seeds.

The advantages of using potassium:
- help increasing the resistance of the plant;
- plays an important role in providing water and nutrient elements necessary for the plant;
- improves the quality of the harvest regarding the flavor, color and shelf life of crops;
- ensure higher quality output;
- reduce the time of maturation process of the plant;
- improoves the resistance of the plant to drought and disease.

The lack of potassium is expressed as follows:
- the plants will not have enough water in the cell;
- the leaves will wither, it will rumple and the edges will crumble at the cropsof corn, wheat, barley, fruit trees, vine-vine;
- appears white spots, yellow-brown or reddish brown;
- the seeds are wrinkled and their germination power decreases;
- it is reduced the resistance of the plants to diseases and pest attack.

Potassium content of fertilizers is expressed as a percentage K20, the amount of potassium in arable layer is 45-47 t/ ha K20, but the plant assimilates only 1-2% of this quantity.

Characteristics of complex fertilizers:
- complex fertilizers appears under the form of granules of different colors depending on the range, respectively, the concentration of nutrients contained in the chemical formula;
- have better physical attributes;
- are less hygroscopic;
- have neutralized the physiological acidity;
- have a greater coefficient use of nutrients;
- leaves no residue in the soil;
- specific gravity: 0,95-1,15 t/m3 (depending on grades).


The advantages of complex fertilizers:
- their management is easy and economical because at the same nutrient content it is reduced the weight of raw product by 2-3 times, and thus making savings on transport, distribution, packaging, storage and input into the soil;
- ensure a more uniform field distribution of the contained nutrients;
- increase the efficiency of fertilizers by introducing simultaneously more fertilizers (nitrogen, phosphorus, potassium) in a single point of the soil.

Disadvantages:
- the different proportion in wich plants consume nitrogen, phosphorus and potassium in relation to the species and the age of the plants, to the fixed ratio of fertilizer complex, which correspond only to certain specific conditions of soil and plants.