1, dead buds. Excessive use of chemical fertilizers such as urea, compound fertilizers, etc. late in the seedbed. After covering the film, the membrane temperature is high, the fertilizer rapidly decomposes, the ammonia concentration is too high, and the embryo and radicle burn, resulting in ammonia poisoning. No seedlings.
2, dead seedlings. Temporary boring machine for fertilizing, using organic fertilizer, granular fertilizer or uneven fertilization that are not fully used in the forum, the number of cultivating is small, the soil is not fully mixed, the root of the radish is burned, the root does not go down, no new root is produced, and the root Yellow-brown, no root hair, easy to pull up, without soil, seedlings into groups or into pieces of yellow, died before the four-leaf period.
3, burning seedlings. Excessive application of chemical fertilizers, causing fertilizer damage burning seedlings.
4, dry dead seedlings. Uncooked bed soil, bed soil compaction, organic matter content is small, shallow living soil layer, poor grain structure, easy to form a compact layer of topsoil, breathable water storage security is poor, the roots are underdeveloped, shallow, in the hot weather in the sun, the seedlings die or die The seedlings gradually lost water, and the leaves curled and died.
5, blue withered seedlings. After Qi Miao, the film was suddenly removed at noon on sunny days. The air humidity around the seedlings plummeted, and the leaves evaporate and lose water, causing the leaves to change from light green to dark green, vertical and acute blue and dry.
6, insecticide killing vaccine. Prior to transplanting, high concentrations of organophosphorus pesticides were sprayed to prevent seedling pests. Due to high temperatures, low air humidity, and large evapotranspiration, coupled with dry tubers and dry soils, the seedlings exhibited chlorotic yellowing of the heart and yellowing afterwards. White, no new leaves, stagnant growth, dwarf than normal seedlings, and then gradually died.
7. Select the right seedbed and fertilize the mature bed soil. The terrain should be high, drainage is smooth, watering is convenient, soil is fertile, and the cool water is breathable. The neutral or weakly acidic soil layer with thicker soil layer is used as a bed for dry seedlings.
The core theories of disease prevention for agronomic practices are: increase the number of fertility days and improve dry matter by using dry seedlings, dry seedlings, and plant dry matter; use phosphorus fertilizer as the basis, use potassium fertilizer as the core, and use nitrogen fertilizer as the adjustment, and adopt a reasonable ratio and apply fertilization on demand. Methods: Make healthy growth of plants (appropriate application of zinc, magnesium fertilizer and biological fertilizers); release toxic gases in soil by three air-bearing and shallow-wet irrigation techniques, increase oxygen levels, and use chemical agents on the basis of plant health; Disease prevention effect is ideal.
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