How to classify weak wheat seedlings
After emergence of wheat, due to the influence of natural conditions and cultivation measures, various types of weak seedlings are often formed. For weak seedlings, symptom management is introduced separately as follows:
1. The weak seedlings caused by soil nitrogen deficiency showed that the seedlings were thin and upright, the tillers decreased, and the leaves were narrow and short. The lower leaves started from the tips of the leaves and gradually became yellow and dry and developed toward the upper leaves. Management points: 7 to 8 kg of urea per mu, or 20 to 25 kg of ammonium bicarbonate.
2. The weak seedlings caused by phosphorus deficiency in the soil showed poor root development, few and weak secondary roots, dark green and leafy leaves, purple tips on leaf tip and leaf sheath, and small and thin tillers. Management points: superphosphate per acre with 20 to 30 kilograms, dressing the sooner the better.
3. The weak seedlings caused by soil drought are often found in wheat fields with insufficient spurs or running through the wind. They are characterized by slow delivery, gray-green leaves, short leaves, slow growth, or stagnation (people call it "shrinkage". "Heart seedlings"), the middle and lower leaves turn yellow and dry, and the roots are small and fine. Management points: Combine irrigation with 15 kg of ammonium bicarbonate per acre.
4. Weak seedlings caused by soil wetting often show pale purple leaves, and births are slow. When the seedlings 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.
5. The performance of weak seedlings caused by excessive sowing is that the seedlings are overcrowded and the plants are thin and slender. Management points: First, pay close attention to sparse seedlings, especially the “headings†in the fields, fields, and fields. Early sparse, sparsely populated, and then apply a small amount of nitrogen and phosphorus fast-acting fertilizers to make up for the excessive consumption of soil nutrients and promote the development of wheat. Weak turn strong.
6. Weak seedlings caused by shallow sowing are due to the fact that the tillering node is too close to the ground surface and the conditions of water nutrients are poor, so that the growth of the root system and the development of the axillary buds are inhibited. Therefore, the roots and tendons are usually reduced, the plants are weak, and they are susceptible to freezing. Withered. Management points: Spreading organic fertilizer, appropriate covering grass, and ramming soil around the roots; when the above-ground parts of the plant basically stop growing, the roots cover the soil. Cover the thickness of the soil so that the birthing section is about 3 cm below the surface.
7. Weak seeding caused by sowing late performance is mostly due to the short growing period before winter, and the accumulated temperature is insufficient, which results in the growth of wheat seedlings being thin and thin, with few tillers. Management points: mainly fertilizer supplementation, applying 15-20 kg of ammonium bicarbonate in three-leaf stage; poor wheat field with poor soil moisture and water seepage; timely pouring of drowning water after the three-leaf stage (however, suitable moisture content or poor soil moisture and poor water permeability Block, before the winter should not be watered), the last time before the end of the seal larvae, we must pay attention to the ram soil to protect the seedlings safe winter.
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