Potassium Fertilizer Applied in Late Apple Growth
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Potassium is a crucial nutrient for fruit trees, particularly when it comes to enhancing the quality of apples. That's why it's often referred to as "fruit fertilizer." Proper application of potassium can significantly improve fruit size, increase sugar levels, and enhance color development. It also contributes to brighter fruit color, smoother skin, better flavor, and overall improved quality. Additionally, it boosts the tree’s resistance to pests, diseases, and improves its ability to withstand storage and transportation.
So, what does "timely" mean in this context? Apple trees absorb less potassium during the early growth stages, but their demand increases as the season progresses. The peak absorption period typically occurs in the late growth phase, usually from early July to early August. Applying the right amount of potash during this time can have a significant impact on fruit development. However, applying the same amount before spring or during flowering may not yield noticeable improvements in yield or coloration.
What about the "right amount"? A general guideline is to apply about 1 kg of pure potassium per 100 kg of produce. Over-application, however, can disrupt the tree's physiological functions and interfere with the uptake of other essential nutrients. For example, excessive potassium can lead to magnesium deficiency and lower calcium levels in the tree, which can negatively affect fruit quality and tree health.
When using potash fertilizer, it's best to choose potassium sulfate due to its high efficiency and effectiveness. Potassium chloride follows closely behind in terms of performance. Organic sources like wood ash or well-decomposed chicken manure, which are rich in potassium, can also be applied under the tree and then lightly watered in. Another effective method is foliar spraying—using a 0.3% to 0.5% solution of potassium dihydrogen phosphate or diluting amino acid potassium at a ratio of 300 to 500 times. These methods can provide additional benefits and help maximize the potential of your fruit trees.