In production, many types of weak seedlings are caused by various reasons such as late planting, soil drought or excessive water, and extensive cultivation. For different types of weak seedlings, we should seize the favorable opportunity of higher temperature in late autumn and early winter, strengthen field management according to local conditions, especially water and fertilizer management, and promote the weakening of wheat seedlings.
1. Weak seedlings caused by extensive ground preparation. The land is flat and the land is loose, the soil is suspended, the roots of the wheat seedlings are poorly developed, and the growth is slow or stopped. For such weak seedlings, measures such as repression, watering, and shallow cultivating after pouring should be taken to remedy.
2. Late seeding weak seedlings. Sowing too late, the accumulated temperature is insufficient, the seedlings are small, and the roots are small and short. For this type of wheat seedlings, it is only suitable for shallow cultivating before winter to increase the ground temperature and maintain the soil moisture, instead of fertilizing and watering, so as to avoid the decrease of ground temperature and affect the growth of seedlings.
3. Low-lying land, weak rice seedlings in rice fields. The soil moisture is too large, the ventilating ability is poor, the new roots of the seedlings grow slowly, the tillers are less, and even the dead seedlings appear. For such weak seedlings, cultivating loose soil and field drainage, divergence ventilation should be strengthened.
4. Weak seedlings caused by sowing. Due to insufficient soil moisture during sowing, the sowing is too deep, and the wheat seedlings are not delayed. Even if the seedlings are emerged, the wheat seedlings are thin and the leaves are slender. For such weak seedlings, measures such as suppression and shallow cultivating should be used to improve the mites, or use the wooden boards to remove the topsoil, so that the depth of the tillering section becomes shallower, thus ensuring the robust growth of the seedlings.
5. Application of unfertilized organic fertilizer or weak seedlings caused by excessive seed fertilizer. Seedlings (or seeds) burn, yellow or even die. For such weak seedlings, water should be watered in time, and the soil should be ploughed in time to remediate after watering.
6. Weak seedlings caused by insufficient base fertilizer. Such seedlings are narrow, pale, small in seedlings, yellow in seedlings, underdeveloped roots, and less tillers. For such weak seedlings, watering should be combined with the application of nitrogen, phosphorus and other quick-acting fertilizers to make the seedlings strong as soon as possible.
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