First, seedlings damage
The seedling damage is the high water content in the soil of seedlings, lack of oxygen, and the rapid growth of anaerobic bacteria, so that the root system of seedlings can not be normally breathed, and the water absorption of fertilizers is hindered. Under hypoxic conditions, the intermediate products produced by root respiration and the organic acids (such as acetic acid) and reducing substances (such as methane and hydrogen sulfide) produced by microbial activity can cause poisoning to the trees, resulting in root suffocation, rot, and even death. , resulting in poor plant growth or even death.
The death process of seedlings suffering from crickets is slow. It usually takes about 20 days to determine whether death has occurred.
Second, the three conditions of harm
There are three main conditions for flooding: 1. Flooding and continued for a certain period of time; 2. Continuously raining or continuing to over water; 3. Soil viscosity, impervious to water, so that the soil will remain too large for a long time. The amount of water.
Third, the symptoms
1. Symptoms on the ground (1) Performance on the tip of the leaf Symptoms: When the gills are light, the leaves and petioles are bent to the front, the shoots grow slowly, and the tip growth points do not elongate or bend; the tip leaves appear yellowish when severed. Slightly wilting, the leaves will curl, the yellow shoots will droop, the tip leaves will dry slowly, and will not fall off after drying.
(2) Trunk symptoms: Slow and dry. The trunk of the dead plant is generally dry from the bottom up as the roots die first.
2. Underground (root) symptoms: The roots are dark (dark blue) and rot, the black spots are blue-gray, and there is a mildew (difficult) taste; the root damage gradually develops upward from the low position, and the root is lower The more serious the damage is. Root (xylem) color change: from low to high blue-black - wax yellow - light yellow changes.
Fourth, preventive measures
1. Fill the soil to increase the planting level; or open the drainage ditch to reduce the water level.
2. Select resistant varieties, such as Metasequoia, Melaleuca sp., Shuiweng, Hainanputao, Chuanqinliu, etc., but it should be noted that they are only resistant varieties, not aquatic plants, and are not suitable for long-term flooding. local.
3. Piers and crevices are planted to increase the topography.
4. Use porous soil. In particular, when planting seedlings and preparing nutritious soil (planting soil), it is necessary to fully consider using sandy loam, and do not use pure loam.
5. For viscous soils with poor permeability, 10 cm of gravel layer on the bottom of the planting hole may be considered during the seedling transplanting to prevent and reduce waterlogging damage.
6. Get ready for drainage: Take precautions, such as plugging the water inlet, and prepare tools for draining drainage, such as pumps for drainage.
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