Recently, some farmers have reflected the phenomenon of “inlaid gold edges†in cucumber leaves. The edges of the leaves are yellow, like gold rims, but the leaf tissue is not necrotic. What is the cause of this phenomenon? In this issue, Hui Nong.com teaches you how to prevent and cure cucumber leaves.
First, the soil is short of water
Because the cucumber in the park belongs to the soilless culture mode, the use of coco peat as a substrate, in the case of less soil moisture and increased solution concentration, due to the antagonistic action of nitrogen and potassium, the plant's absorption of calcium is hindered.
Therefore, in operation, the plant should ensure sufficient water supply, reduce the antagonism of various elements, and enhance the absorption of calcium.
Second, soil salt accumulation
The concentration of fertilizer is too high, causing salinization. This situation often leads to yellowing of cucumber from bottom to top. Cucumber rapid absorption of nitrate of ammonium nitrate and amide nitrogen is better absorbed, used mostly in the cultivation of ammonium, a large amount of ammonium after conversion can not be applied to the soil Microbial It becomes nitrate nitrogen, and accumulation in the soil directly leads to excessive concentration of soil solution.
Nitrogen content of the soil, resulting in high potassium ion soil salinization occurs, so that the various elements of the mobile in the soil is suppressed, while the high salt concentration causes plasmolysis root cells, which largely suppressed other trace elements in the absorbent, yellow leaf edge effect that occurs when such lack of boron, zinc, iron and other trace elements.
In the operation should be noted that fertilizer should not be too large, top-dressing to use in multiple, caused by excessive soil to avoid a high concentration, impact absorption.
Third, the lack of calcium leads to yellowing of the leaf margin
A plurality yellow edge occurs due to calcium deficiency in young plant parts, leaves margin generally appear more uniform yellow edge, and will expand to the interior severe.
Due to soil drought or excessive watering, cucumber root cause injury, affecting the absorption of calcium in the roots. Due to the large amount of chemical fertilizer applied, the concentration of soil solution is increased, and the movement of calcium is inhibited. At the same time, the content of nitrogen and potassium in the soil is too high, which antagonizes calcium and reduces the absorption of calcium.
In the case of gold-plated edges, 0.5% superphosphate solution can be applied to the leaves to enhance plant vigor.
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