How to judge the symptoms of cucumber deficiency in solar greenhouse

In the greenhouse, the temperature in the greenhouse is low for a long time, the air humidity is high, and the transpiration is relatively weak. The nutrient absorption activity of the cucumber root system is decreased, which may lead to frequent occurrence of deficiency and nutrient imbalance.
1. Calcium deficiency: The internode shortens, the leaf margin of the young leaves is yellowed and curled upward, withered from the leaf margin, and the top bud is necrotic.
2. Magnesium deficiency: The veins near the main vein are chlorotic, the chlorotic part is enlarged to the leaf margin, and the leaf margin still retains some green color. In severe cases, the veins are all faded and whitened. In addition, in the low temperature period, more fertilizers and more water are prone to "yellow leaves", which are caused by imbalance between nutrients, which occur on the upper and middle leaves of the plants. The leaves are yellow and thick, and the plants are not long. Less roots. One-time application of chemical potassium fertilizer, cucumber leaves sometimes appear as linear fading yellowing along the sides of the veins, or spotted fading between the veins, is the performance of potassium and magnesium malnutrition.
3. Nitrogen deficiency: the leaves are thin and small, the yellowing is uniform, and no speckle is formed. The yellowing gradually develops upward from the lower leaves, and the young leaves grow slowly.
4. Phosphorus deficiency: plant growth is hindered, dwarfed, leaves are small, the color is dark green, the leaves are flat and slightly upward, the old leaves appear dark plaques, and the lower leaves are easy to fall off.
5. Potassium deficiency: slow growth, short internodes, small leaves, leaf margins turn yellow-green, leaves curled, and the leaves are scorched and dry when severe, and the symptoms gradually develop from the lower old leaves to the upper leaves.

Huaxian County Agricultural Products Inspection and Testing Center Chang Bili

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