Names of fertilizers containing potassium with phosphorus and instructions for use

Gardeners use many types and forms of fertilizers in their practice. At the initial stage of crop development, nitrogen agents are usually used. However, subsequently it is necessary to use drugs based on potassium and phosphorus. They contribute to the proper development of cultivated plants and help increase productivity. Today there are many effective types of potassium-phosphorus preparations on sale.

What fertilizers are considered phosphorus-potassium fertilizers?

Such fertilizers contain phosphorus and potassium. These substances are very important for the full development of crops. In this case, nitrogen is usually required at the initial stage of growth. The fertilizer, which is classified as phosphorus-potassium, should be used later. Such compositions promote fruit formation and increase yield parameters.

Numerous studies confirm the need to use phosphorus and potassium based products. The deficiency of these components is clearly noticeable when growing crops in a greenhouse. In this case, the soil is in constant tension and practically does not rest. Therefore, the soil needs to be enriched.

Varieties

There are several groups of fertilizers with the following names:

• liquid or soluble in water;
• sparingly soluble;
• lemon- or citrate-soluble.

The first category includes universal substances. They can be used for different types of soil and plants. Such funds are allowed to be applied by foliar application. They are also used to feed the root system.

The second category is considered long-lasting. The compositions need to be applied to an impressive depth. They are used for feeding perennial plants and growing winter wheat.

The last category of fertilizers is distinguished by its versatility. With their help, it is possible to restore the structure of all types of soil. It is necessary to introduce such substances only to great depths.The most pronounced effect is observed when used on acidic soil.

What plants are they used for?

Preparations containing phosphorus help strengthen plants, making them more resistant to frost, disease, and mechanical stress. Potassium is necessary for full flowering and fruit formation.

Most often, such products are used to feed the following crops:

1. Garlic requires constant addition of potassium and phosphorus. With their help, the marketability of fruits is improved and productivity increases.
2. Cucumbers - potassium and phosphorus are used up to 4 times during the season. In this case, it is permissible to use single drugs or combined substances.
3. Tomatoes - they need such products. If there is a shortage of them, the fruits become deformed and become stained. In addition, the bushes stop growing.
4. Grapes - bushes need to be fed in several stages. This is done after waking up in early spring, after the leaves appear, before flowering, at the stage of fruit ripening.
5. Strawberries – for this crop it is important to choose the right preparation. It should include equal amounts of potassium and nitrogen and slightly less phosphorus. During the growing season, such fertilizers are used twice. The first time this is done before planting, and the second time after receiving the first fruits.
6. Apple trees consume more nutrients than vegetable crops. Therefore, potassium-phosphorus fertilizers need to be applied at the planting stage. During the growing season, the composition is used foliarly.

Characteristics and instructions for use

Today there are many drugs based on potassium and phosphorus on sale. This helps you choose the most suitable option.

Superfos

This fertilizer does not contain chlorine.It is sold in granule form and includes precipitate, ammonium phosphate and ammonium sulfate. The fertilizer is versatile. It can be used at all stages of cultural development.

Simple superphosphate

The drug contains 26% phosphorus. In addition, it includes 17% calcium, 6% nitrogen, 10% sulfur, 0.5% magnesium. The product is usually used in the fall when digging up soil. It is prohibited to combine it with lime, different types of nitrate, and urea.

Double superphosphate

This preparation includes 40-50% phosphorus. It is necessary to apply the substance in the fall when digging up the soil. It can also be used before flowering. It is important to take into account that double superphosphate can dissolve only 40%. Therefore, one feeding in the summer will not give noticeable results. Moreover, the cultures gradually absorb the active substance.

There is no point in feeding annual plants with this composition, since it does not affect the yield parameters. In this case, the substance is perfect for perennials. It helps to increase their resistance to frost. To increase the effectiveness of the drug, it must be combined with organic agents.

Bone flour

This composition refers to organic fertilizers. Animal bones are ground to obtain the substance. Since the drug is completely natural, gardeners often use bone meal during the growing season. The substance is quickly absorbed by plants.

Thermophosphate

This drug consists of 14-30% phosphorus. The specific amount depends on the type of thermophosphate. Thus, tomasslag includes at least 14% of this component. Fertilizer is obtained from ore processing.The composition belongs to the category of alkaline agents, therefore it is used in acidic soil.

Defluorinated phosphate

This product is an analogue of superphosphate. It consists of 28-30% phosphorus. The drug can be used for fertilizing black soil. It dissolves easily. The production of fertilizer is carried out by sintering the components - sand and apatite concentrate.

Open hearth slag (phosphate slag)

This term refers to a highly alkaline product that includes up to 15% phosphorus. The composition can be used for acidic soil types.

Precipitate

This product contains a lot of phosphorus - up to 25-30%. The drug is produced in the form of a white or gray powder. It can be used for all types of soil during the growing season, and can also be applied before winter.

Phosphorite flour

This preparation includes 19-30% phosphorus. It is excellent for acidic soil types and is completely safe for the environment. Moreover, phosphorus in such a preparation is in a form that is difficult to obtain. It takes several months to release it.

Vivianite

This product contains 25-28% phosphoric acid. It is sold as a blue or blue-gray powder. Sometimes it contains peat impurities. In this case, the volume of phosphorus is reduced to 12-20%.

Ammophos

The drug belongs to the category of poorly soluble compounds. It contains up to 12% nitrogen. This component is found in the fertilizer in the form of ammonia. It is recommended to apply the composition before winter. It can also be used to root a culture.

Diammophos or ammonium hydrogen phosphate

This unique fertilizer helps improve plant development and reduce soil acidity parameters. The composition is characterized by a high phosphorus content.This helps to reduce the amount of substance applied to obtain the desired effect. The composition can be combined with organic products.

Potassium chloride

This substance includes 50-60% potassium. It is most often used in the fall when digging up soil. At the same time, the composition contains chlorine, which can be dangerous for some plants.

Potassium sulfate (potassium sulfate)

This drug includes 45-53% potassium. It also contains 18% sulfur. The substance mixes well with water and is easily absorbed by plants. It is recommended to apply the drug in the fall when digging up the soil.

Potassium salt

This is a simple and strong composition. It contains sylvinite in combination with potassium chloride. The composition should be applied in the fall after harvesting.

Signs of nutritional deficiency

The following signs indicate a lack of nutrition:

• change in leaf shape and color;
• the appearance of spots on the plant;
• leaf fall;
• slowdown of growth processes;
• violation of root development;
• decrease in yield.

Potassium and phosphorus are considered essential elements that every plant requires. To replenish the shortage of these substances, it is necessary to select the correct preparations containing them and apply them in strict accordance with the instructions.