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Management of ten weak seedlings of wheat
Weak seedlings caused by soil drought occurred in wheat fields with insufficient soil moisture or run through the wind. The characteristics are: the birth was slow, the leaves were grayish green, the leaves were short, and the growth was slow or stagnant (the masses called it “mind-heartedâ€). The middle and lower leaves turn yellow and dry, and the roots are small and fine. Management points: In combination with watering, topdressing 15 kg of ammonium per acre. The weak seedlings caused by the lack of nitrogen in the soil are erect and thin, and the tillers are reduced, and the leaves are narrow and short. The lower leaves start from the tips of the leaves, gradually turn yellow and dry, and develop towards the upper leaves. Management points: 7 to 8 kg of urea per mu, or 20 to 25 kg of ammonium bicarbonate. The weak seedlings caused by the lack of phosphorus in the soil showed poor root development. The secondary roots were weak and weak. The leaf color was dull green, the tip and leaf sheath were purple, the plants were thin and the tillers were reduced. Management points: In combination with watering and ploughing, 20 to 30 kg of calcium superphosphate per acre is used to chase after the ditch, and the earlier the effect of topdressing, the better. Weak seedlings caused by wet soil or saline-alkali damage usually show poor root development and weak absorption capacity of the young seedlings. The birth of the young seedlings is slow and often accompanied by deferring fertilizer. The heavy-alkali-damaging plots often appear as patches of purple. The "old young seedlings", the seedlings at the base of 1-2 yellow leaves dry, and when serious, the seedlings will die. Management points: Combine deep-middling cultivating, applying nitrogen-phosphorus compound fertilizer to open ditch, heavily saline-alkali-damaged land, apply salt pressure after top-dressing, and timely remove the loose soil to remove the compaction. The weak seedlings caused by the soil plate hard due to the lack of soil moisture, root extension difficulties, resulting in short yellow wheat leaves, can not appear on time delivery. Management points: Watering in time, then deep cultivating tillage to remove the rigid layer. Weak seedlings caused by soil wetting usually show pale purple leaves, and births are slow, and when they are severe, their tips turn white and dry. Management points: The first timely and deep cultivating ventilation, followed by a small amount of quick-acting fertilizer to promote early-onset seedlings. The performance of weak seedlings caused by excessive sowing is: seedlings are overcrowded and plants are thin and slender. 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 performance of the weak seedlings caused by sowing too deep is: the emergence is slow, the leaf sheaths are slender, and the seedlings are not long afterwards. Management points: First clear the earth with trees, and then topdress fertilizer (15 kg per mu for ammonium bicarbonate) to promote root and seedling development. The weak seedlings caused by sowing are too close to the surface due to the tiller node, and the water nutrient conditions are poor, so that the growth of the root system and the development of the axillary buds are inhibited. Usually, the roots and pods are reduced, and the plants are weak in yellow and are easily dies of freezing. Management points: In conjunction with scratching, earthworms are encircled; when the above-ground parts of the plants basically stop growing, the earth is broken. Covering the soil thickness to make the tiller section about 3 cm below the surface is appropriate. If the soil is covered with soil, it is covered with clay and covered with sand, which can also improve the soil. The weak seedlings caused by planting too late were due to the short growing period before winter, and the accumulated temperature was insufficient, which resulted in the growth of wheat seedlings being thin and weak and having fewer tillers. Management points: Mainly use paddling and replenishing fertilizer, and apply 15 kg of ammonium bicarbonate in the three-leaf stage; soils with poor soil moisture and fast water seeps; timely flooding after the three-leaf stage (however, suitable moisture content or soil viscosity, water seepage Poor land should not be watered before the winter), and the last time it is ploughed before freezing, it is necessary to pay attention to the soil and to protect the seedlings safely.