Potassium requirement crops are necessary for all plants, the need for this element is different. More than others, they need potassium: from vegetables – cabbage (especially cauliflower), cucumbers, sprouts, carrots, potatoes, beans, eggplant, peppers, tomatoes, squash and other melons; from fruit and berry crops – apples, pears, plums, cherries, raspberries, blackberries, grapes, citrus; from flowers – head lilies, hydrangeas, anthuriums, streptocarp, brovallia, gerbera, spatifilum; from cereals – barley, buckwheat, flax. But the need for potassium for currants, onions, radishes, lettuce, gooseberries and strawberries is one and a half times less. The use of potassium fertilizers for this type of crop has its own characteristics.
Thus, many vegetable crops are harmful to chlorine, so it is better to supplement the potassium requirement with fertilizers containing potassium sulfate and sodium, which is especially true for root crops tends to transfer sodium carbohydrates from leaves to roots. It is recommended to apply potassium fertilizers for tomatoes at the same time as planting. For the growth of these plants is not necessary to improve fruit formation and quality.
Lack of potassium, which explains the unripe green part of the tomato, sometimes reaching half of the fruit, or spreading it over uneven areas. But processing tomatoes with fresh potassium fertilizers can lead to an increase in the green mass of the bush, which adversely affects the abundance and quality of the crop. In general, an excess amount of phosphorus is more appropriate than the amount of potassium for proper growth of tomatoes.
The need for potassium for cucumbers leads to fruit deformation (they are pear-shaped), the lashes are elongated, the color of the leaves changes to a darker color. You can feed this culture with potassium sulfate or wood ash. For cucumbers it is recommended to use kalimagnesia in combination with superphosphate during the flowering period (10 g per 10 l of water) as a root dressing. Grapes should be fed with potassium fertilizer every year, for which ordinary ash is most suitable. It can be dried or diluted with water.