How to deal with the waterlogging of seedlings. In the past few days, the middle of Zhejiang ushered in a plum rainy day. Although it was a rainy season, it was a violent rainy season. A few days ago, it had just rained and it was clear, but not one night, the rain came again. Jinhua has become a city of water. There is standing water everywhere, and the drainage of the sewers can’t match the amount of precipitation. This precipitation has brought a lot of trouble to many people, and even disasters. The water has reached the knees, and many cars have entered water. Residents in low-lying terrain can raise fish on the first floor. For the large number of famous farmers, this is undoubtedly a disaster, causing certain damage to urban and rural greening seedlings.
Nursery inundated by heavy rain: Because the growth of seedlings is inseparable from the climate. Regarding the remedial measures for seedlings after the flood disaster, the author collects data and sorts out some training methods on how to remedy seedlings after floods, hoping to give customers a reference.
1. Eliminate stagnant water: The damage of waterlogging to trees is directly proportional to the length of time of flooding. Immediately take effective measures for the accumulation of water in forest farms, nurseries, forests, etc., organize the masses to do everything possible to quickly remove them, and minimize the soaking time of the seedlings. Take timely measures such as loosening the soil and drying the roots to improve the permeability of the soil and avoid the large-scale death of trees due to long-term water accumulation. If the seedlings are in a flooded state for a long time, the water content in the soil is too high, and oxygen is lacking, the roots of the trees cannot breathe normally, which will inevitably cause the roots to rot and die. Drainage digging and mechanical drainage can be used. When draining, the seedlings that are not seriously affected by waterlogging can be manually drained, and for large areas or severely affected by waterlogging, water pumps and other equipment can be used for drainage.
2. Quickly straighten: After the plant is flooded and blown by the wind, the root system is damaged and easy to fall. It must be straightened and straightened in time after drainage. For the fallen trees, all saplings (fast-growing willow, weeping willow, golden-leaf locust, fragrant locust, and national locust) with a diameter of less than 10 cm, immediately organize the masses to straighten them. Large trees that have fallen severely shall be dealt with according to the situation to maximize their survival. The big trees that could not be straightened were immediately cleaned up and replanted in autumn and winter. Clean up the silt on the plant surface in time to facilitate photosynthesis and promote plant growth. In addition, proper shading should be carried out. First, the shading can avoid strong light exposure and prevent the surface from heating up too high, and second, it can effectively reduce the evaporation of water from the tree.
3. Field soil loosening: After drainage, wait until the topsoil is slightly dry (a non-stick shovel is appropriate), and promptly carry out field cultivation. The purpose of cultivating is to accelerate the evaporation of soil moisture, increase the air permeability of the soil, and help restore the tree vigor and prevent retting.
4. Increase the application of quick-acting fertilizer: After the crops are flooded, a large amount of soil nutrients are lost, and the absorption capacity of the root system is weak, timely topdressing is beneficial to the restoration of plant growth. Before the plant resumes growth, spray fertilizer mainly on the leaves, and choose some common foliar fertilizers on the market according to the actual situation. After the plant regains its growth, fertilize the roots, increase the application of phosphorus, potassium, and trace elements to enhance the plant's resistance to stress.
5. Prevention and control of diseases and insect pests: After the flood, the seedbed or pot soil has high temperature and high humidity, coupled with weak plant growth and reduced stress resistance, forest trees are highly susceptible to diseases such as canker, rot, and black spot. Therefore, water accumulation After discharge, spray the fungicide on the trees in time. Investigate and prevent and control the spread in time. For the prevention and treatment of poplar canker disease and rot skin disease, you can choose 100 times of Junbiqing or Miefuling. For severe diseases, you can use 50 times of the medicine to brush the trunk; for the prevention of poplar black spot, you can choose 25% chlorothalonil 800 Double solution, or 70% thiophanate-methyl 1500 times solution, or 50% carbendazim 1000 times solution whole tree spray, 0.3% urea and potassium dihydrogen phosphate can be added for foliar fertilization at the same time when mixing the liquid. The time of chemical control is sprayed once every 7 days and sprayed 3 times continuously. You can also choose high-efficiency and low-toxic counterpart pesticide control; if it rains after applying the pesticide, you have to re-spray the pesticide again. The general use of the pesticide to prevent the disease is 2 to 3 times.