According to the method of production, all modern complex fertilizers are divided into mixed, complex and complex-mixed. It is customary to refer to the second ones such as ammophos, potassium nitrate, diammophos. These drugs are obtained as a result of the chemical interaction of the components. Microelements, herbicides and some pesticides are added to liquid and solid compound fertilizers.
Combined (complexly mixed) include complex fertilizers, which are obtained as a result of a single technological process. Such chemicals in one granule contain two or three main nutrients important for plant development, in the form of compounds. The combined ones include: nitrophoska and nitrophos, nitroammophoska and nitroammophos, potassium and ammonium polyphosphates, carboammophos, liquid complex mixtures.
Mixed compounds are called simple fertilizers, which are obtained in the process of dry mixing.
Hard-mixed and complex blends are high in nutrients yet very economical to use.
Despite all their advantages, complex fertilizers have one significant drawback - the proportions in the NPK content in them vary within rather narrow limits.
In complex preparations, the percentage composition of the constituent elements is usually strictly observed, however, if some changes are required, then by making simple calculations, these changes can be made independently. For example, if complex fertilizers for vegetables contain insufficient nitrogen, then a simple chemical with a high nitrogen content can be added to them, but only professional agricultural technicians can reduce the content of one or another component.
At the time of digging the earth in spring or autumn, to effectively enrich the soil with minerals, you can use preparations with a high content of a substance such as calcium carbonate, which perfectly extinguishes acidity. This is especially important for those areas where tomatoes are located.
Complex fertilizer for tomatoes in the seedling method of growing is applied when planting seedlings in the ground. 500 grams of humus mixed with one tablespoon of ash and one teaspoon of superphosphate are added to the plant hole. Top dressing of tomato seedlings can be carried out within ten days after planting and rooting.
First time, tomatoes are fed with mullein, and complex fertilizers can be applied already during the second such procedure.
Double and regular superphosphate are the most popular and common drugs usedwhen planting a tomato. These chemicals include: phosphorus, calcium, sulfur, magnesium and nitrogen. Each of these elements has its own beneficial effect. So, calcium effectively lowers the acidity of the soil, and magnesium is simply necessary for nightshade plants for normal and active development. Complex fertilizers are usually available as powder or granules.
