The Causes and Countermeasures of Leaf Color Abnormal in Wheat Seedlings
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First, the soil is dry. This situation occurs most often in wheat fields where there is not enough ground or runs through the wind. Its characteristics are: childbirth is born slowly, leaves are grayish green, heart leaves are short, growth is slow or stagnant (the masses call it "squeezing the heart"), the middle and lower leaves turn yellow and dry, and the roots are small and thin. Management points: In combination with watering, topdressing 15 kg of ammonium per acre.
The second is nitrogen deficiency. Seedlings are thin and erect, with fewer tillers and shorter and shorter leaves. The lower leaves start from the tips of the leaves and gradually become yellow and dry and develop toward the upper leaves. Management points: 7 to 8 kg of urea per mu, or 20 to 25 kg of ammonium bicarbonate, or 600 to 700 kg of human waste.
Third, the soil is hard. Due to the lack of soil in the soil, the roots are difficult to spread, resulting in short yellow wheat leaves and the lack of timely delivery. Management points: Watering in time, then deep cultivating tillage to remove the rigid layer.
Fourth, the broadcast volume is too large. Its performance is seedling growth crowded, competing with each other, competing for fat, competing for water, plant yellow thin, thin and weak. Management points: First, pay attention to sparse seedlings, especially the “headings†in the fields, fields, and fields, and early sparse, sparsely drowning, combined with watering, topdressing with a small amount of nitrogen and phosphorus fast-acting fertilizers to make up for the excessive consumption of soil nutrients. , to promote wheat seedlings from weak to strong.
The fifth is insect pests. Wheat crickets or red spiders can also cause yellow leaves. Management points: find hazards, timely use 40% omethoate 1500 ~ 2000 times liquid spray.
Red leaf seedlings cause the formation of red leaf seedlings.
One is the stains. Autumn seedlings with too much rain or low waterlogging in wheat fields will cause damage to the leaves, turning the leaves into dark red, and severely killing the roots. Management points: timely drainage in addition to the ditch to remove water, and topdressing a small amount of quick-impact fertilizer, promote early-onset seedlings.
The second is the lack of phosphorus. Wheat seedlings lack of phosphorus, root development is poor, secondary roots are weak and weak, leaf color is dark green and lusterless, leaf tip and leaf sheath are purple, implant wiping is thin, delivery time is delayed, the number of tillers is reduced, and even the childbirth does not occur. Management points: Combine ploughing and loose soil, using 20-30 kg of superphosphate per acre, and pour furrows or pour water between rows, the sooner the better.
The third is salt and alkali hazards. Salt-damaging heavy-duty plots often appear as patches of purple-colored “small old seedlingsâ€, and seedlings die when they are severe. Management points: timely delineation and warming, breaking the consolidation, inhibiting the return of salt, and timely application of winter fertilizer, and promote hair strong seedlings. When the late spring wheat rises, top dressing is done and the salt is filled with water.
The fourth is frozen. In winter, when the temperature suddenly drops below 0°C, the freezing of the wheat seedlings will also make the leaves red. Management points: Combine ploughing and ramming soil, 75 to 100 kg of plant ash per acre, and if necessary, after winter wheat enters the wintering season, Shun Ridge removes a layer of “warm ditch manure†to protect the seedlings safely.
When the purple leaf seedlings are deficient in boron, the stems and leaves are hypertrophied and the leaves are purple. The formation of "Purple leaf seedlings", serious late "ear but not smashing", a great impact on the yield. Management points: 150-200 grams of borax per acre, with appropriate amount of nitrogen, phosphate fertilizer with water pouring, or 50-100 grams of borax per acre, watering 50-60 kg of foliar spray.
When the brown seedlings were deficient in potassium, the plants grew slowly, the roots developed poorly, and they were perishable. The leaves were dark green or blue-green, and were covered with soft undergrowth. The tips and edges of the brown seedlings were brown and then browned to form a "brown leaf seedling." Management points: Use 15 kg of potassium sulfate per acre, or 100 kg of plant ash, follow the application of a trench between the rows, or spray them with 0.2-0.3% potassium dihydrogen phosphate solution.
When the white wheat seedlings are deficient in zinc, lobular disease occurs, and the leaf margins are distorted or shrunk. The veins on both sides turn green from yellow to white, and yellow, white, and green striped bands appear on the edges, forming a “yellow-white seedlingâ€. Management points: 1 kg of zinc sulfate per acre, against fine dry soil or organic fertilizer 15 to 20 kg, applied in the ditch between the lines, the sooner the better, or with 0.1 ~ 0.2% zinc sulfate solution foliar spray.