Symptoms A nitrogen-deficient leaf turns light green to yellow-green, yellowing from the outer old leaves, yellow veins appear first, and then gradually expands to mesophyll. After the nitrogen deficiency, the new leaves grow slowly or stagnate, the leaf area is small, the plants are small and weak, the growth is weak, the old leaves of the outer layer wither and die, the nitrogen deficiency strain is weak, and all the leaves spread out as if they were trampled. When the nitrogen deficiency was yellow, the whole leaf depth was the same, and the tip and the leaf margin of the yellowing disease were orange. The two phosphorus deficient growth is slow, the leaves are small and thin, dark green, the leaf margin becomes red to purple spots, and the leafy stalks are upright. In the middle stage of reproduction, the leaf color changes from dark green to light green to light yellow-green, and the outer leaves are dark brown. Spots, posterior leaves become thinner, leaves dry, and leaves are dull. The tips and leaves of the old leaves of the three-deficient potassium outer layer turn yellow and the veins are still green near the veins. After that, the yellow color gradually expands toward the middle of the leaves, the leaves become thin and shrink, the leaf edges are brown and dry, and the petiole is also brown spots and Stripe, the bud of the mother root is easy to die, and the resistance to disease is weakened. In the early period of the four boron deprivation, variegated color gradually appears, yellow or purple spots are formed, the petiole usually has vertical cracks, the leaves are often twisted, the petiole is slightly shorter and loses green, and when the boron deficiency is serious, the growing point can be made. Decay or death, the roots begin to darken and decline, initially in the neck part, the back edge along the edge, the roots develop small, curved, the root surface often shrinks or cracks. The five deficient manganese leaves become erect, triangular in shape, curled at the edge of the leaf, with yellow spots, and withering when severe, the leaves gradually turn dark red to purple, and roots or aboveground growth slowly decay. Six zinc-deficient leaves rot, brown to gray spots appear, and the tips of the leaves wither. Only petiole remains green. The young leaves of the seven copper deficiency are blue-green, and the old leaves start from the tip of the leaf and are now in the form of marble-like lacuna. They gradually expand to the entire leaf. The veins are green, the leaves are thin, and the green part turns whiteish-white or brown, and the edges are wavy. Roots are long, white. The eight iron-deficient leaves are slender, and the green spots or all yellowish green spots appear on the leaves, and the old leaves are slightly reddish. Nine magnesium deficiency first fades and whites from the veins of the old leaves, giving rise to a variety of luster colors and a marbled pattern. Afterwards, the leaves sag and produce dead tissue. Sometimes the leaves are not yellow and fall off. Some leaf bleaching appeared bleached white, and some were white and green color phenomenon.
Causes of Nitrogen Deficiency There is a large amount of nitrogen in the rainfall, and soils with severe leaching or low organic matter content can cause nitrogen deficiency. Phosphorus-deficient soils, organic moons, leached soils, and lime- or heavy-metal-contaminated soils are susceptible to phosphorus deficiency. Soils with poor potassium soil, heavy leaching, or high cropping index can cause potassium deficiency. Four boron-deficient alkaline sand and naturally acidic leaching soil are easily deficient in boron. Five lack of manganese organic matter, calcareous soil easy to lack of manganese. Six deficient zinc and calcareous soils, soils with high Ca, Mg, and P are susceptible to zinc deficiency. Seven-deficient copper is generally highly weathered and susceptible to lack of elements on sandy loam. Eight iron-deficient calcareous soils and soils rich in P, Mn, Cu, Zn, or other heavy metals are prone to iron deficiency. In addition, excessive soil temperature and humidity can also cause iron deficiency. Nine deficiency magnesium acid soil and saline-alkaline soil can cause symptoms of magnesium deficiency.
Control methods Sugar beet requires a large amount of fertilizer, each producing 2000kg roots, about the need for nitrogen 10kg, phosphorus pentoxide 3.0kg, potassium oxide 12kg, fertilizing the field according to yield indicators and soil nutritional status. If the 667m2 produces 2000kg plots, it needs pure nitrogen 10.8kg, phosphorus pentoxide 10.7kg, potassium oxide 10kg, the ratio is generally 1:1:1. Basal fertilizer for the total amount of 55% to 60%, the best fall. Fertilizers account for 15% to 20% of total fertilization. Available organic fertilizers and various fertilizers. Generally 667m2 organic fertilizer 1000kg, ammonium nitrate 2.5 ~ 5kg, superphosphate 10 ~ 20kg, potassium sulfate 3 ~ 4kg or plant ash 25 ~50kg. Beet top dressing often accounts for 20% to 25% of the total, and is generally dominated by nitrogen, with a suitable amount of phosphate fertilizer. That is, when the seedlings are 667m2 ammonium nitrate 7.5 ~ 10kg, superphosphate 5 ~ 7.5kg, potassium sulfate 3 ~ 4kg; ridge dressing before the second top dressing, 667m2 ammonium nitrate fertilizer plow into the pit immediately covered with soil. Beet enters the later period of fertility and requires a large amount of phosphorus and potassium. It can apply 0.6% to 1% potassium chloride solution or 1% to 2% of superphosphate leachate after ridging, and sprays 70L of fertilizer solution every 667m2. , If necessary, spray 0.1% borax or potassium sulfate solution 60L, the best choice for sunny afternoon.
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