Potato deficiency
The symptoms of nitrogen deficiency before flowering were obvious. The plants were short and weakly growing. The leaves were pale green and then yellow. In severe cases, the upper leaves of the leaves were cup-shaped. In the late growth period, the leaf margins of the base leaflets were completely chlorotic and shrinking. Burned, leaves fall off, low yield. Control measures: Early application of nitrogen fertilizer can be used as a seed fertilizer or seed dressing. When nitrogen deficiency was found, foliar spray of 0.2%~0.5% urea solution or nitrogen-containing compound fertilizer was sprayed in time. Phosphorus deficiency early phosphorus deficiency affects root development and seedling growth. In the absence of phosphorus, the plants are short, stiff, dark green, and the leaves turn up; phosphorus deficiency occurs from the buds to the flowering stages, the leaves shrink, the color is dark green, and the petioles and leaflets are severe. With the leaf margins facing upwards, they do not expand horizontally. The area of ​​leaflets is reduced and the color is dark green. Prevention and control measures: The phosphorus-deficient field is increased with organic fertilizer and ditch is applied with calcium phosphate or diammonium phosphate as the base seed fertilizer. When phosphorus deficiency was found, the leaves were sprayed with 0.2%~0.3% potassium dihydrogen phosphate solution or 0.5%~1% superphosphate calcium leaching solution. The potassium deficiency develops from the bottom up, and the lower leaves first develop symptoms, the plants grow slower, the internodes become shorter and clustered; the tips of the leaves and the leaf margins turn brown and fade, and brown necrotic spots often appear on the leaves. Plaques, leaflet tip atrophy, leaf curling downward, veins subsidence; potassium deficiency severe when the plant was "top withered." Control measures: Basal fertilizer mixed with 200 kg of ash. After 40 days of planting, long-term application of potato fertilizer with 150-200 kg of plant ash or 10 kg of potassium sulfate is applied to water. It is also possible to spray 1% potassium sulfate solution 40 to 50 days before harvest, once every 10 to 15 days, once every 2 to 3 times. In the early days of calcium deprivation, pale green bands appeared on the leaf margins of the young apical buds, and necrosis caused the leaflets to shrink or twist. In severe cases, the apical buds or axillary buds died. The roots are prone to necrosis, the tubers are small, and there are abnormally formed strings of small tubers with necrotic spots in the marrow of the tubers. Prevention and control measures: In the soil with strong acidity, calcium deficiency is prone to occur. Apply appropriate amount of lime to supplement the deficiency of calcium in soil or adjust soil pH. When calcium deficiency was found, the leaves were immediately sprayed with 0.3% to 0.5% calcium chloride solution once every 3 to 4 days for a total of 2 to 3 times. Magnesium deficiency is a crop that is sensitive to magnesium deficiency. In the absence of magnesium, the leaves, leaf margins, and veins of the old leaves fade from the green to the center, and later lower leaves become brittle and thicken. Control measures: Apply sufficient organic fertilizer to improve soil physical and chemical properties, so that the soil remains neutral, if necessary, lime can also be used to adjust to avoid the soil acid or partial alkali. Magnesium-deficient fields should be treated with magnesium sulfate such as magnesium sulfate or dolomite. When magnesium deficiency was found in the plants, the leaves were sprayed with 0.5% to 1% magnesium sulfate solution in time, once every 2 days, and sprayed 3 to 4 times. In the absence of boron, the growth of stem ends stopped, and the growth point became necrotic in severe cases. Lateral buds and lateral roots germinated and grew in branches and leaves. The leaves are rough, wrinkled, curled, thickened and brittle, shriveled, wilted, wilting, petiole and shoots thickened and shortened, cracked, corked, or spotted or lumps. Tuber brown necrosis. Control measures: Borax-free soil 0.5 kg borax per acre. When the boron deficiency occurred in the plants, a 0.1% borax solution was sprayed on the leaves. The growth of zinc-deficient plants was inhibited, the internodes were short, the top leaves upright, the leaves were small, and there were gray to bronze irregular spots on the foliage, and the leaves edge curled upwards. When severe, brown spots appear on petioles and stems. Control measures: Zinc-sulphate soil base application of 0.5 to 1 kg of zinc sulfate. Zinc deficiency was found in the plants, and 0.5% zinc sulfate solution was sprayed on the leaves and sprayed once every 10 days. Symptoms of Mn deficiency first appeared on new leaflets. After chlorosis between veins, it was light green or yellow. Severe veins were almost white and there were many brown spots along the veins. In the end, the small spots die and fall off, rendering the leaves incomplete. Prevention measures: Due to the high soil pH caused by the lack of manganese, should be more acidic fertilizers such as ammonium sulfate to reduce the pH, such as the lack of manganese in the soil itself, can be 2000 grams of manganese sulfate per acre base. Symptoms of iron deficiency first appeared on the young leaves. The leaves of iron deficiency were chlorotic and white, and the leaves were often bleached and called chlorosis. In the initial period, the veins faded and the veins remained green. The color of the veins was deeper than that of the leaves. The color circle was clear, and the chlorotic tissue curled upwards. In severe cases, the leaves turned yellow and turned white. Control measures: Foliar spray 0.5% to 1% ferrous sulfate solution 2 or 3 times. Head Massage,Head Massage Spa,Best Head Massager,Relaxing Head Massage Shenzhen Jie Zhong Lian Investment Co., Ltd. , https://www.szmeizons.com