The potassium deficiency showed slight yellow flowers on the leaf margin, and then the leaf margins died, with the leaves growing toward the outside. Prevention and control measures shall be supplemented with potash fertilizer in a timely manner, and supplemental application of potash fertilizer shall be carried out simultaneously with iron supplementation.
Magnesium deficiency The leaves of the lower leaves of the cucumber gradually lose their chlorosis and yellowness between the veins of the cucumber and are further developed. In addition to the leaves having a little greenness, they turn yellow, and when severe, the upper leaves also turn yellow from the inside. Prevention and control measures increase organic fertilizer, formula fertilization, to avoid partial nitrogen fertilizer caused by the soil acidity affect the absorption of calcium and magnesium. Magnesium deficiency when the leaves can be sprayed with 1%-2% magnesium sulfate, pay attention to magnesium supplementation should be combined with potassium supplement zinc.
Boron deficiency in the absence of boron when the growth point of necrosis, incomplete flower development, leaves, stems, fruit to stop growing, the edge of the yellow, yellow part of the wider, cracks on the peel. Control measures to increase fertilizer, do not use too much lime, reasonable watering. To supplement boron fertilizer in time, chelated boron series can be used to avoid soil damage caused by a single application of borax fertilizer.
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