Symptoms of potassium deficiency in apples and how to replenish potassium

Potassium deficiency in apples can easily occur in fine sandy soil, acidic soil and soil with little organic matter, insufficient sunlight and overly wet soil can also show potassium deficiency.

I. What are the symptoms of potassium deficiency in apples?

The leaf margins of the basal and middle leaves lose their green color and are often curled upward. In case of heavy potassium deficiency, the leaf margins become brown and scorched, and in severe cases, the whole leaf is scorched and hangs on the branch, not easy to fall off, which also aggravates the occurrence of bitter pox disease and pox disease.

The correction method for apple potassium deficiency: 20-25 kg of potassium sulfate or 15-20 kg of potassium chloride per mu, or 0.2%-0.3% aqueous potassium phosphate solution or 1-2% potassium sulfate or potassium chloride per mu for foliar spraying.

Second, what are the symptoms of excess potassium in apples

Apple potassium excess is prone to induce magnesium deficiency, the absorption and utilization of nitrogen, calcium, iron, zinc and boron are affected, the fruit skin is thick, hard, easy to hair sheep, not storage and storage.

Correction of excess potassium in apples: increase irrigation to reduce the concentration of potassium in the soil. If livestock manure and urine are used, potassium fertilizer should be used sparingly.

Third, how to apply potassium fertilizer for growing apples

Potassium is one of the important elements needed by fruit trees, especially for improving apple quality and fruit quality, so potassium fertilizer is also called fruit fertilizer.

Applying potassium fertilizer at the right time and in the right amount can increase the fruit size, sugar content and color. The amount of potassium applied can be 1 kg of pure potassium per 100 kg of production, and care should be taken not to over-apply.

Tips on potassium fertilization for apple trees

The absorption of potassium in apple trees is less in the early stage of growth and gradually increases later.

When applying potassium fertilizer, it is advisable to use potassium sulfate, which has a high absorption rate and an obvious effect, followed by potassium chloride, or organic fertilizers with high potassium content, such as grass ashes or well-rotted chicken manure, which can be spread under the tree and then shallowly buried and watered.

Foliar spraying with 0.3% to 0.5% potassium phosphate solution or 300 to 500 times of amino acid potassium solution can also be effective.