1. Weak seedling caused by extensive preparation of soil. The formation of the land is poor, with more litter in the bright and dark areas, loose soil, poor root development, and slow growth or stoppage. For such weak seedlings, measures such as repression, watering, and shallow medium tillage should be adopted to remedy the situation.
2, late seeding weak seedlings. Sowing late, the accumulated temperature is insufficient, the seedlings are small, and the roots are small and short. For this kind of wheat seedlings, only moderate tillage should be done before winter to increase the temperature of the soil and keep the soil moisture. It is not appropriate to apply fertilizer and water to prevent the temperature of the soil from falling and affect the growth of seedlings.
3, low-lying land, weak rice seedlings in wheat fields. Excessive soil moisture, poor ventilation and water permeability, new seedling root growth is slow, fewer tillers, and even dead seedlings. For such weak seedlings, we should strengthen the cultivating loose soil and field drainage, ventilation ventilation.
4. Weak seeding caused by deep sowing. Due to insufficient soil moisture during sowing, the seeds are so deep that the young seedlings will not emerge. Even if the seedlings emerge, the seedlings will be thin and the leaves will be slender. For such weak seedlings, measures such as repression and shallow cultivator should be used to lift the soil, or to remove the topsoil with a wooden board, so that the soil depth of the tiller section can be lightened, thus ensuring the seedlings to grow robustly.
5, the application of weak organic fertilizer or seedlings due to excessive weak seedlings. Seedlings (or seeds) burn, yellow and even die. For such weak seedlings, they should be watered in time and be reclaimed by timely cultivating loose soil after watering.
6. Weak seedlings caused by insufficient base fertilizer. Such seedlings have narrow leaves, light color, small seedlings, yellow seedlings, underdeveloped root systems, and fewer tillers. For such weak seedlings should be combined with water, topdressing nitrogen, phosphorus and other available fertilizers, so that as soon as possible weak seedlings strong seedlings. Http://
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