Recently, the No. 18 typhoon "Nasha" and the 19th typhoon "Niger" successively landed in Hainan and many areas of Guangdong and Guangxi brought heavy rainfall. Storms have adverse effects on vegetable production. Rainwater can cause poor pollination of fruits and vegetables, and break the stems and leaves of vegetable plants, leaching of fertilizers, soil compaction, and weakening of vegetables. If the management is not timely, it will easily cause disease. To this end, it is recommended that the majority of vegetable farmers adopt the following technical management measures.
First, exclude stagnant water
After the rain, the water in the field should be removed in time to stop the rain in the field, reduce the soil water content, restore the root growth of the vegetables, and prevent the plant roots from suffocating due to excessive water accumulation.
Second, clean up the countryside
After the storm, it is necessary to clean up the residual branches in the field, remove the diseased plants and clean up the old leaves, yellow leaves and diseased leaves in the lower part of the plant for centralized treatment to reduce the pathogens. Do a good job in cultivating seedlings or cassava fruit.
Third, cultivating loose soil
The phenomenon of soil compaction often occurs after the rain. Wait for the rain to stop. The soil is slightly dry and then hurry to carry out the cultivating and loosening soil. The cultivating loose soil can improve the aeration of the soil, reduce the soil moisture and improve the physical and chemical properties of the soil to improve the vitality of the root system.
Fourth, spraying foliar fertilizer
After the heavy rain, the roots of the melons have a poor ability to absorb water and fertilizer. At this time, foliar fertilization should be adopted for topdressing. 0.2% potassium dihydrogen phosphate plus 0.5% urea solution or some foliar fertilizer containing trace elements (such as Tsui Kang Hua Ling) or sprayed energy-enhancing amino acids can be used. Foliar-like fertilizers allow plants to quickly return to life.
Five, artificial assisted pollination
Rainwater often causes excessive humidity in the field to affect the pollination success rate of melons and fruits in the flowering period, which affects the rate of results and requires artificially assisted pollination. In the morning of the sunny day, choose the male flower that has just opened, remove the corolla, shake the stamen on the pistil a few times, let the pollen fall into the female flower or rub the stamen on the pistil to finish the artificial pollination. This can improve the result rate.
Sixth, scientific fertilization
During the rain period, the fertilizer is lost, the rain is stopped, the weather is fine, the soil is slightly dry, and the P and K fertilizers and the available nitrogen fertilizer are added after the ploughing of the soil. Because the roots of the vegetable after the Taiwan wind and rain are slightly weaker, the principle of fertilization is to apply the thinner to enhance the growth and achieve the increase in production and resistance. The purpose of the disease.
Seven, replenish seedlings, replanting
For vegetables that have just been transplanted, if the seedlings are scarce after the storm, they can be replanted in time. However, the fields that have been flooded and harvested must be ploughed and ploughed to adapt to local conditions, such as cabbage, cabbage, and radish. In order to save the benefits and reduce losses.
Eight, clean the sludge
Stormy weather will splash a lot of sludge to the newly planted vegetables and the seedling bed seedlings can be combined with the spray surface fertilizer or spray to clean the leaves of the leaf back to enhance the photosynthesis to quickly restore growth.
Nine, the net cooling
In the case of hot days after the rain, the seedlings that have not been transplanted in the seedbed should be covered with a sunshade net and an insect net for cooling. Because the soil is poorly ventilated after rain, the roots are weak. If it is hot in the hot sun, it is easy to lose water or stagnate.
X. Prevention and treatment of pests
After the rain and rain, the humidity of the vegetable field is large and the resistance of the plant is greatly weakened by the impact of rain. Common diseases such as vegetable blight, downy mildew, soft rot, root rot, and squatting are prone to occur. At the same time, pests such as cotton bollworm and tobacco budworm may also occur in large areas. To this end, the use of fungicides and insecticides should be used in a timely manner for spray control. Can be used for chlorothalonil, methyl thiophanate, carbendazim, agricultural streptomycin, carbendazim, etc., and insecticides such as trichlorfon and avermectin can be used. Imidacloprid and soybeans are eliminated and the like is controlled.
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