Currently, it is a critical period for the growth of vegetables in the summer and seedling emergence of autumn vegetables, but it is often hit by heavy rain, resulting in a substantial reduction in yield and quality. If the vegetables that have not emerged after sowing have been washed out by heavy rain, some of the seeds will be exposed on the bare surface, some will be washed away by the rain, resulting in the lack of seedlings. The young seedlings will be washed out by heavy rain, and the young roots will be exposed outside the soil. After sun exposure, wilting and dying; Even with larger vegetables, lodging and stem and leaf damage often occur after heavy rains; if the water accumulation takes a long time, the plant will die and die. Vegetables that have been damaged by heavy rain have reduced stress resistance, and pests and diseases often occur more severely, resulting in a significant decrease in yield and quality. According to the author's investigation in the Weifang area of ​​Shandong Province, if the control measures are not in place for vegetables that are damaged by heavy rainfall, the output will generally be reduced by 2 to 30%, and the heavy ones will be over 50%. Therefore, to improve the production of summer vegetables, the prevention of heavy rain is a key measure.
The main measures for the prevention of rainstorms from vegetables:
1. Renovate the drainage ditch system in the greenhouse and Daejeon as soon as possible. Ensure smooth drainage and ensure that no water accumulates on the ground after the storm.
2. Do a good job of coverage. For non-emerging vegetables, timely cover with grass cover, straw, sunshade nets and other coverings, so that it can not only cover the shade, prevent buds from drying out, but also can effectively reduce the erosion of heavy rain, to ensure that "one seeding seedlings."
3. Quickly rule out the water in the fields after the storm and help the fallen plants. Spray water off the plants with water to facilitate photosynthesis and promote plant growth as soon as possible.
4. Carry out the "Planting Garden". Thunderstorms at noon during the day are "hot rain," with high temperatures, which can easily damage the vegetable roots. On the basis of rapidly removing water, immediately use well water to irrigate it again. Due to the relatively low temperature of the well water, the surface soil temperature can be lowered in time after watering to prevent high temperature damage to the root system and promote the restoration of root vigor.
5. Timely top dressing. In order to promote the recovery of the affected vegetables as soon as possible, after removing the accumulated water, timely apply the quick-acting fertilizer and spray the first mixture of 0.3% potassium dihydrogen phosphate and 1% urea once. When the soil moisture is suitable, topdressing urea per acre. ~ 8 kg.
6. Strengthen the cultivator loose soil. The cultivator can speed up the distribution of excess soil moisture, improve the permeability of the soil, increase the vitality of the root system, promote the absorption of nutrients under the roots, and prevent disease and promote the robust growth of the vegetable seedlings.
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