First, the main reasons for the seedlings to cause leggy growers are excessively high, especially when the temperature is too high at night, and it is more likely to occur when there is excessive breathing. In addition, nitrogen fertilizer and excessive water, sowing too dense, not timely transfer seedlings, etc., can easily lead to seedlings leggy. The seedling period can be divided into the following four categories:
1. Appearance to the cotyledon development period is the most likely to cause appetite. At this time, the leggy was mainly due to sowing too dense, and after the emergence of seedlings, the cover was not removed in time, making the seedlings too crowded.
2. After the emergence of the seedlings, the temperature of the seedlings did not cool down in time, and the epicotyls of the seedlings were also prone to overgrowth.
3. Cotyledons spread to the 2nd to 3rd leaf stage. When the seedlings are not seeded, or because the temperature is too high and they are not planted in time (moving the seedlings into the grasshopper), the seedlings become overcrowded and appear to be long.
4. After planting seedlings after transplanting to planting, due to the high soil and air humidity in the seedbeds, nitrogen fertilizers in the nutrient soils are relatively high, and the management of the seedlings that are not airy, light-transmitting, and crowded and crowded will also appear long.
Solution:
1. The sowing density should not be too large to avoid seedling crowding after emergence. At the same time, ground cover was removed in time after about 30% emergence.
2. Strengthen ventilation and light transmission, control temperature and humidity. After the seedlings are unearthed and before planting, ventilation and light transmission should be carried out to reduce the temperature and humidity, and to strengthen the low-temperature exercise and control the overgrowth of seedlings.
3. Reasonably carry out fertilizer and water management. In the preparation of nutritious soil, attention should be paid to the amount of phosphorus and potash fertilizer and the amount of nitrogen fertilizer should be controlled. Strict control of moisture and topdressing in the seedbed requires topdressing nitrogen fertilizer when dressing is required.
4. And time seedlings. About 20 days before planting, the seedlings often appear overcrowded. At this time, the seedlings should be properly moved to separate the seedlings and the survival space of the individual plants.
5. Pharmacy control apprentice. In addition to the above-mentioned measures, once the seedlings are grown, they can be sprayed with 50% Chlormequat 2000 to 2500 times.
Second, the causes of plant leggy caused by leggy plants also include factors such as temperature, humidity, excessive nitrogen fertilizer or excess nutrients.
Solution:
1. Less application of available nitrogen fertilizer: During the cultivation process of various crops, especially during the pod-logging period, nitrogen fertilizer is often excessive, resulting in excessive growth and excessive growth, resulting in excessive vegetative growth and insufficient reproductive growth. Therefore, the use of nitrogen fertilizer is much less.
2. Nutrition regulation: According to the characteristics of humic acid foliar fertilizer and amino acid foliar fertilizer to control the growth potential at a certain concentration, combined with disease prevention and pest control, the addition of auxin, chlorophyll, and other hormonal drugs is effective and fruitful. Pure, high yield.
3. Scratch cutting root: When the plant grows too busy, you can take "plotting method." On the one hand, it increases the permeability of the soil, and on the other hand, it can break off some of the roots, which is conducive to the sub-roots.
4. Poor water pouring: to meet crop needs while reducing soil moisture.
5. Shading nets and other auxiliary measures to cool down.
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