Nitrogen deficiency: The plants are short, thin, and light green in color. The lower leaves first age, turn yellow and fall off, and then gradually move up and over the whole plant. Remedy: timely topdressing available nitrogen fertilizer, usually 15-20 kg per mu urea water, or with 1-2% urea solution 50 kg per acre spray on the foliage. Phosphorus-deficient elements: The plants grow slowly, dwarf, and the stems and leaves are long and rich in wood. The leaves become smaller, and the leaves are dark green and dull. When they are serious, they are purple, curled leaves, and tissue necrosis. Remedy: top-up superphosphate 20-30 kg/mu, or 0.2-0.4% potassium dihydrogen phosphate aqueous solution spraying 2-3 times. Potassium-deficient elements: The lower leaves of the initial plants were light gray-green, followed by bronze or yellow-brown, and the leaf margins became brown. The necrotic lesions appeared along the veins and the tissues of the leaves rotted and died. In severe cases, it also develops to new leaves, the stems become slender and hard, and the roots become weak and brown. Remedy: When symptoms of potassium deficiency occur, immediate fertilizer such as potassium sulfate should be applied immediately. It can also spray 1-2% potassium dihydrogen phosphate solution 2-3 times. Calcium deficiency: The plant is short and has no premature aging. The vegetative growth at the stem end is slow, forming a thick woody stem; The lateral root tip is dead, showing a knob-like protrusion, the young leaf is curled, and the leaf edge turns yellow and blunts the green from the tip. And the leaf margins died inward; the top buds of the plants were necrotic, but the old leaves were still green. Remedy: spray per acre with a 1% calcium chloride aqueous solution 50 kilograms. Manganese-deficient: young leaves on the upper part of plants lost chlorosis or brown spots and defoliation, and later developed into yellow leaves and the upper part of the stem became brown and dead. Remedy: Keep the soil neutral, and apply 1-1.5 kg of manganese sulfate per acre; also use 0.05-0.2% of manganese sulfate aqueous solution of 50-75 kg per acre during the flowering period and young crop period for foliar spray 1- 2 times. Boron deficiency: Plant growth point atrophies brownish and dry. The newly formed leaf buds and petiole are pale and brittle, deformed, internodes shorter, clustered lobule on the stem, plant-shaped plexiform, leaves curled, non-flowering fruits, in severe cases, the root growth is blocked, brown rot. Remedy: Soil acidification should be prevented, and 0.2-0.3% multi-element boron fertilizer, or 0.1-0.2% boric acid aqueous solution, is a good way to solve the problem of boron deficiency in cucumber. The cucumber can be sprayed once in the late period of vegetative growth and reproductive growth. Each fertilizer spray fertilizer 50 kg -75 kg. Magnesium deficiency: occurs mostly in the later period of childbirth. The appearance of old leaves and yellow leaves and veins are still green, and then the lesions appear, and transfer to the site of new tissue, until dead. Remedy: Use 0.2-0.5% magnesium sulfate aqueous solution 50 kg per acre for foliar spray 1-2 times. Zinc deficiency: yellowish green leaves, spots, leaf tissue necrosis, stems become shorter. Remedy: Use 0.05-0.2% agricultural zinc sulfate aqueous solution, topdressing 50-75 kg of fertilizer solution per acre root. Iron deficiency: young leaves and veins chlorosis, yellow-white, when the whole leaf yellow and white dry, but does not show necrotic spots, there is no death. Remedy: spray per acre foliar spray of 0.1-0.2% of ferrous sulfate aqueous solution 75 kg, once every 7-10 days, spray a total of 2-3 times. Copper deficiency: Plant growth is weak, young leaves are wilting, green is not lost, stem tips are weak, and they are still alive, without necrotic spots. Remedy: Foliar spray of 0.05% aqueous solution of copper sulfate. The lack of molybdenum: poor plant growth, the old leaves chlorosis, yellow leaf spots between the leaf margin and leaf veins, leaf margins curled inwards, tip atrophy, often causing plants to flower not melon. Remedy: Spray 0.05-0.1% ammonium molybdate aqueous solution 50 kg per acre, spray 1-2 times in seedling and flowering stages, respectively.
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