During the fruiting season, grapes take about 200 g of potassium from the soil. This element is one of the most important and necessary for the full development of vines and berries. Therefore, it is important to regularly supplement the potassium-containing fertilizers with fertilizers.
Benefits of Potash
The grape needs more potassium compared to other plants in the garden. With its lack, the leaves on the bush become pale, and their edges die off. In addition, this trace element contributes to:
- Improving crop resistance to low temperatures, droughts and diseases.
- Reduce the ripening period of berries and ripening vines.
- To increase the sugar content of berry juice and reduce their acidity.
- Enhancing the aroma of berries.
Features of fertilizer application
In order to grow a good harvest and get quality fruits, you need to feed the plants at least once every two seasons. With root top dressing, fertilizers are applied to previously dug grooves at a distance of 1.5 m around the bush. Non-root ones are carried out by spraying foliage with nutrient solutions.
Feeding is recommended in the early spring, before the leaves bloom. Potassium for grapes can also be used in autumn, after harvesting.
Throughout the season, it is allowed to use special top dressing with potassium salt, potassium sulfate.
Feeding is carried out in 4 stages:
- Held in March. Under one bush no more than 50 g of potassium is introduced.
- Before flowering begins, potassium salt, potassium sulfate, or another fertilizer containing phosphorus, potassium, and nitrogen is added. During this period, it is possible to carry out non-root dressing with humate or potassium iodide.
- It is carried out during active fruiting. The amount of potassium introduced should be significantly lower compared to the first top dressing.
- It is carried out after harvesting. During this period, fertilizers should contain only potassium (not more than 50 g per bush) and phosphorus.
The use of potassium sulfate
Plants perfectly absorb this drug, so experienced gardeners recommend fertilizing grapes with potassium sulfate. Due to its good solubility in soil, it can be used at any stage of vine growth.
This type of fertilizer can also be used as non-root dressing according to the following instructions:
- A solution is prepared in which the concentration of the substance does not exceed 0.2% (20 g of the drug is used per 10 liters of water).
- Processing plants is carried out after sunset – this will maximize the contact time of plants with the solution.
For feeding by irrigation, a solution is prepared at the rate of 10 l of water and 15 g of superphosphate. We feed plants every week, starting in September and ending shortly before the first frost. In the spring, while tying the brushes, watering is renewed and we continue to apply monopotassium phosphate before the onset of hot days.
- Gumate processing grapes
- Outside the root dressing of grapes with humate allows you to accelerate plant growth and improve the taste of berries. This drug, like potassium sulfate, is considered one of the best means to enrich the soil in the vineyards with potassium.
- Watering plants with a humate solution helps to improve root growth and accelerate the formation of humus in the soil.
- This drug is also used to soak grape seeds or cuttings before planting.
- A solution for root dressing is prepared at the rate of 1 g of 8% liquid preparation per 1 g of water. About 1 liter of working solution is consumed per 1 m2.
- For outside root dressing, the solution is prepared at the rate of 40 ml of the drug per 20-30 liters of water. Spraying is carried out at the stage of budding, at the end of flowering and during the setting of berries.