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How to prevent and treat cucumber deficiency in greenhouses
Nitrogen deficiency. The plants are short, thin, and light green in color. The lower leaves are aged, yellow, and even fall off. Afterwards, they gradually move up and spread throughout the plant. Remedial measures: timely topdressing of available nitrogen fertilizer, generally mu urea 15 kg -20 kg of water applied, or with 1% -2% of urea solution sprayed 50 kg per 667 square meters. Phosphorus deficiency. Plants grow slowly, dwarfing, stems and leaves long; rich in wood, leaves become smaller, dark green leaves, dull, purple when severe, curly leaves, tissue necrosis. Remedial measures: Use 0.2%-0.4% potassium dihydrogen phosphate fertilizer spray for 2 times -3 times per 667 square meters, the effect is better. Potassium deficiency. Initially, the lower leaves of the plants were light gray-green, followed by bronze or yellow-brown, and the leaf margins turned brown, showing necrotic lesions along the veins and necrosis and decay of the mesophyll tissues. In severe cases, it also develops to new leaves, the stems become slender and hard, and the roots become weak and brown. Remedial measures: Topdressing quick-acting fertilizers such as potassium sulfate, and spraying foliar 1%-2% potassium dihydrogen phosphate solution. Calcium deficiency. The plants are short, with premature aging, the vegetative growth at the stem end is slow, and a thick woody stem is formed; the lateral apex is dead, showing a knob-like process, the young leaves are curled, and the leaf edge turns yellow and dies of green and then comes inward from the tip and leaf margin. Death; plant top bud necrosis, while old leaves are still green. Remedy: Foliar application of calcium fertilizer. Manganese deficiency. The upper young leaves 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. Remedial measures: to maintain the soil neutrality, and acres of manganese fertilizer l kg -2.5 kg, can be sprayed in the flowering period, the period of melon phase of 0.05% -0.2% manganese sulfate solution. Boron deficiency. The growing point shrinks and turns brown. The newly formed leaf buds and petiole are pale, brittle, deformed, internodes shorter, clustered lobule on the stem, plant-shaped plexiform, leafy leaves curled, and not flowering. In severe cases, the root growth is obstructed and brown rots. Remedy: Prevent acidification of the soil, topdressing 0.1%-0.2% boric acid or borax outside the roots. Magnesium deficiency. Occurs later in childbirth. The appearance of the old leaf mesophyll was yellow and the veins were still green, with lesions appearing, and they migrated to the site of new tissue until they died. Remedy: Foliage sprayed with 0.2% to 0.5% magnesium sulfate solution per 667 square meters. Zinc deficiency. Leaf color yellowish green, spotted, necrotic tissue between veins, stems shorter. Remedy: Use 0.05%-0.2% zinc sulphate solution for external application. Iron deficiency. Leaves young leaves and veins chlorosis, yellow-white, when severe, the whole leaves turn yellow and white, dry, but does not show necrotic spots or death. Remedy: Foliar application of 0.1% -0.2% ferrous sulfate. Copper deficiency. The plants grow weakly, the young leaves are wilting, green is not lost, the stem tips are weak, and they are still alive, without necrotic spots. Remedy: Spray foliar 0.05% copper sulfate solution. Deficient molybdenum. The growth potential of the plants is poor, and the old leaves are chlorotic. The leaves between leaf margins and leaf veins are yellow-patch-shaped. The leaf margins are curled inwards and the tips of the leaves are atrophic, often causing the plants to fail to bloom. Remedy: Use 0.05%-0.1% ammonium molybdate solution per 667 square meters for seedling or flowering period. The above-mentioned method of “deficiency diagnosis of cucumber in greenhouses†often requires comprehensive judgment and comprehensive management. The author introduced a method to the majority of farmers: the balanced fertilization method: the base fertilizer is 50 kg per 667 m2 of high-fertilizer compound fertilizer. The special effect of GMS is to balance the supply of plant fertilizers, and foliar spraying of organic fertilizers. Fertility liquid fertilizer 500 times -800 times. It can significantly regulate plant nutrition, disease resistance, deworming, increase income, and extend harvest time.