The so-called pre-winter strong seedlings are mainly manifested in two aspects: one is the individual and the other is the group. In other words, the above-ground part of the wheat seedling basically stopped growing, and when it began to overwinter, the individual showed an average of 5 leaves, 1 heart, 6 leaves and 1 heart. The leaf color was dark green, large and strong, and the plant type diver showed “chicken claw shapeâ€. The total number of stems in the group mu must reach 700,000-900,000. The main measures to achieve pre-winter seedlings are:
Fine site preparation before sowing. The wheat field is 20-24 cm deep and 2-3 times. To achieve ground-level soil broken, no light dark, empty, real virtual reality, ditch and edge parallel to straight.
Pour a good bottom water. Put a good bottom of water before sowing, so that you can plant enough seeds. The soil moisture content in the soil is between 17% and 18%.
Apply base fertilizer. Before the planting, 7,000 kg of crude fertilizer, 50-60 kg of ammonium bicarbonate, 75-100 kg of superphosphate, and 1.5 kg of zinc sulfate were applied before planting.
Strengthen pre-winter management. Before wintering, three main measures are taken: 1. Cultivate grassland, draw water after raining or rainwater, and control cracks; 2. Prevent and treat seedling diseases and insect pests. When wheat emerges up to 50%, use organophosphorus pesticides such as imidacloprid along the ground. Spray 2-3 meters into the side to form a protective tape to eliminate the virus disease of Laodelphax striatellus, aphids, and wheat. Once the underground pests occur, use 50% phoxim 1500 times liquid to dredge along the ridge. 3. Apply timely winter irrigation. The average temperature dropped to about 3°C, and winter irrigation was conducted during the night when it was frozen to protect the wheat seedlings from winter.
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