The symptoms of potassium deficiency in peach trees appear earlier and are more prominent in spring. The initial manifestation is that the leaves in the middle of the branches shrink. When the potassium deficiency continues, the leaves shrink more obviously and expand faster.
In case of drought at this time, leaf curling is prone to occur, and the whole plant is wilting. Leaf shrinkage is a typical symptom of potassium deficiency in peach trees, and it is also the main difference from the symptoms that occur when peach trees are calcium-deficient, frozen and peeled.
When peach trees are lacking in potassium, the use of nitrogen is also restricted. Therefore, when the leaves are shrunk, they can also show nitrogen deficiency. The leaves are yellow-green, and then some hazel necrotic spots are formed on the leaves, which gradually expand into tan spots. , The edges are reddish brown or purple. Necrotic tissue is easy to fall off, showing perforation or nick.
The yellowed leaves are not easy to fall off. If there are necrotic spots on a large number of leaves, the leaves will fall early when the branches re-accelerate.
After summer, if potassium is deficient, the leaves will fall early; if potassium is deficient in the late growth period, the leaves can fall off normally after autumn.
The symptoms of potassium deficiency in peach trees can gradually aggravate during the entire growth period, especially where the necrosis at the leaf margins spreads fastest. The necrotic tissues are easy to rupture when exposed to wind, and the backsides of curled leaves often turn purple or light red.
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