What are the symptoms of potassium deficiency in apples? How to apply potassium fertilizer to apples? BY:Cynthia
Potassium deficiency in apples is prone to fine sand, acidic soil, and soil with little organic matter. Insufficient sunlight and excessively wet soil can also show potassium deficiency. This article discusses the symptoms of potassium deficiency in apples and introduces how to apply potassium fertilizer when planting apples.
1. What are the symptoms of potassium deficiency in apples?
The leaf margins of the base leaves and middle leaves lose their green color and turn yellow, often curling upward. When potassium deficiency is severe, the green part of the leaf margins turns brown and scorched. In severe cases, the entire leaf scorches and hangs on the branches, making it difficult to fall off, which will also aggravate the occurrence of bitter pit and pox.
Correction methods for potassium deficiency in apples: apply 20-25 kg of potassium sulphate or 15-20 kg of potassium chloride per mu, or spray 0.2%-0.3% potassium dihydrogen phosphate aqueous solution on the leaves, or 1%-2% potassium sulfate or potassium chloride.
2. What are the symptoms of excess potassium in apples?
Excess potassium in apples can easily induce magnesium deficiency, which affects the absorption and utilization of nitrogen, calcium, iron, zinc, and boron. The fruit peel is thick, hard, and easy to become cottony, and it is not storable.
Correction methods for excess potassium in apples: increase irrigation and reduce the concentration of potassium in the soil. If livestock manure and urine are used, potassium fertilizer should be used less.
3. How to apply potassium fertilizer when planting apples
Potassium is one of the important elements required by fruit trees, especially for improving the quality of apples and fruits. It has an irreplaceable role, so potassium fertilizer is also called fruit fertilizer.
Applying potassium fertilizer in a timely and appropriate amount can significantly increase the size of the fruit, increase the sugar content, and improve the coloring. The application amount can be 1 kg of pure potassium per 100 kg of output. Be careful not to apply excessively.
4. Tips for applying potassium fertilizer to apple trees
The absorption of potassium by apple trees is less in the early growth stage, and then gradually increases. The peak critical period of absorption is in the middle and late growth period, generally in July and August.
When applying potassium fertilizer, potassium sulfate with high absorption and utilization rate and obvious effect should be selected, followed by potassium chloride. You can also use organic fertilizers with high potassium content such as wood ash or decomposed chicken manure to spread under the tree, and then bury it shallowly and water it.
If you use 0.3% to 0.5% potassium dihydrogen phosphate solution or 300 to 500 times potassium amino acid solution for foliar spraying, you can also get better results.
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