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:
The weak seedlings caused by soil nitrogen deficiency showed: 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.
The weak seedlings caused by lack of phosphorus in the soil showed: poor root development, less and weaker secondary roots, dark green leaves and dull leaves, purple tips on leaf tip and leaf sheath, and thin and small tillers. Management points: Use 20 to 30 kg of superphosphate per acre. The earlier the effect, the better.
The weak seedlings caused by soil drought are: wheat fields that occur mostly at the end of the crop or run through the wind, and are characterized by slow birth, gray-green leaves, short and thin leaves, slow growth or stagnation, and yellow and dry leaves in the middle and lower parts. The root is small and fine. Management points: Combine irrigation with 15 kg of ammonium bicarbonate per acre.
Weak seedlings caused by soil wetting often show: pale purple leaves, slow birth, and severe white tips. 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 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.
The weak seedlings caused by the shallow sowing show that: because the tiller node is too close to the surface, the water nutrient conditions 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 vulnerable to freezing and dying. . 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.
The weak seedlings caused by sowing late showed that due to the short growing period before winter and the insufficient accumulated temperature, the growth of wheat seedlings was thin and the number of tillers was small. 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, should not be watered before the winter), the last time before the freezing plan, should pay attention to the soil to the roots, in order to protect the seedlings safe winter.
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