What harm will rainwater do to vegetable crops? What to do?

Rainwater backflow not only seriously affects farmland operations, but also brings many hazards. Summer rains are mostly acidic, especially thunderstorms, which often lead to soil acidification and seriously affect the normal growth of crops. Some greenhouses are not drained in time, resulting in serious soil compaction, low oxygen content, poor air permeability, and slow emergence of vegetables after planting, which is not conducive to root growth.

Greenhouse fertilizers that have been fertilized will also cause some fertilizer loss and waste due to rainwater, especially nitrogen fertilizer. In addition, rainwater entering the shed is easy to bring pathogenic bacteria, which is harmful to the root system of crops.

<> rainy season, vegetable farmers should remedy the rain in time while taking rainproof measures in the shed. The root system is the basis for the growth of vegetables and is the main protective organ. After pumping water for drainage or drying, according to the growth of vegetables, do a good job of soil hoeing in time.

Before picking, the greenhouse with drip irrigation system can carry out appropriate well water drip irrigation according to the actual situation, which is conducive to breaking the canopy closure of the surface and reducing the ground temperature. To protect the root system of crops, hoeing can be followed"One big and one small"According to the growth state of crops and the distribution of roots, the appropriate small hoe (the hoe area should be narrow), which is conducive to breaking the compaction of the soil surface, increasing the transpiration of soil moisture and reducing soil moisture.

Timely use of medicine to irrigate roots to prevent root rot and other root diseases, such as oxazoliline plus rooting agent. Promotes the root system to return to normal growth as soon as possible. If there is slight waterlogging, vegetable farmers should strip the soil around the base of the vegetable stem in time to speed up the evaporation of water, so that part of the root system is in contact with the air, and re-cover the soil after 2 or 3 days.

After the soil in the shed is dry and wet, hoe the grass in time.

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It will have a certain impact on the growth of your crop, so that it stops growing, or it grows poorly, and it will also produce bacteria, which will cause the roots to rot, and it may also lead to the death of the plant and the decrease in yield; After the rain, the rainwater should be brought down from the greenhouse in time, and the plastic film of the greenhouse should also be of good quality, and the sealing should also be guaranteed.

It is harmful to vegetable crops with rotten roots, and may also lead to excessive acidity of vegetables. It may also lead to a poor harvest of vegetables. It will also cause the vegetables to become smaller.

It can also lead to spoilage of vegetables. Attention should be paid to controlling the temperature and humidity of the surrounding area, and it is also necessary to pay attention to the weather and rain again, and the vegetables should be covered in advance.

It is easy to cause plant rot, it will cause the leaves of the plant to be affected, it is easy to cause wilting and death, and there may be some bacterial infection, the best way is to pay attention to the treatment of the greenhouse, which can be pasted with tape in the leaky place.

1.The potential danger of root rot increases.

The long-term rainy weather makes the soil overhumid for a long time, and the water accumulation is close to saturation, resulting in the pollution of the current green leafy vegetables, melons, nightshade fruits, beans and other vegetable varieties, resulting in the decline of vegetable root vitality and the ability to absorb fertilizer and water. , the leaves are green, the growth and development are slow, and the growth of crops is generally deviated.

2.The quality of vegetables deteriorates.

Long-term low temperature and low light environment affects the photosynthesis of vegetables.

It leads to yellowing of vegetable leaves, thin plants, slow growth and development, rotten buds of bean vegetable seeds sown in early spring, low seedling emergence rate, and irregular seedling emergence. Pollination and fruit setting of nightshade and melon crops were affected to varying degrees. The seedling stage is generally weak, the growth is poor, or the growth is high.

The transplanting time is delayed, and the growth is slow or slow after transplanting. The phenomenon of growth stoppage, late flowering and fruit drop were more obvious. Green leafy vegetables, lettuce, water spinach, slow growth, leaf rot.

Diseases and other early spring vegetables, the yield fell early, and the marketing period was delayed.

3.It is the increase in the incidence of pests and diseases.

Continuous rainfall causes a sudden drop in temperature, insufficient light, and increased humidity, and the root growth of eggplants, vegetables, and melon vegetables is poor, and leafy vegetables.

Weak growth, poor disease resistance of plants, powdery mildew, gray mold, downy mildew, leaf mold, snail, cotton bollworm, beet armyworm.

and other pests and diseases are easy to spread. In addition, there is fog in some areas in the morning and evening, which is not conducive to the prevention and control of local vegetable diseases.

4.The yield of vegetables has declined.

More rainy weather and less sunlight lead to slow growth of leafy and nightshade vegetables. The production of domestic vegetables such as cabbage, lettuce, and cabbage, which should have been marketed in large quantities, has been greatly reduced, and the time to market has also been delayed. The market needs this vegetable for export.

The increased reliance on vegetable regulation, transportation costs and storage costs have led to the emergence of vegetables, resulting in a significant increase in the number of vegetables.

5.The vegetables were submerged and damaged.

Many vegetable bases in Jiande, Shaoxing and other places in China were flooded, resulting in hypoxic rot of vegetable roots and serious death of the whole plant. Reduce yield and quality. It can also cause vegetable pests and diseases.

Long-term rain and high humidity cause damage to plants, and it is easy to induce powdery mildew, leaf mold, downy mildew, soft rot and other diseases, as well as snails and jumping worms.

Pests such as ape leaf worms, noctuidae moths, etc. deterioration, affecting the quality and safety of vegetables.

It will have a serious impact, it will lead to a large reduction in the number of production, it will affect the quality of vegetables, it will affect the income of vegetable farmers, and it will affect the air temperature.

It has a serious impact, which will lead to a large reduction in vegetables, which will affect the yield of vegetables, destroy the land structure, and lead to the loss of vegetable farmers.

In the case of this greenhouse planting, it has just rained, do not water it first, and the cooling water will reduce the soil temperature in the greenhouse, which is not conducive to the growth of the crops just planted.

We had a heavy rainstorm and a lot of crops in the fields were damaged. At present, most areas are in the high temperature and high humidity rainy season, at this stage heavy rain, strong winds, precipitation, rainfall is frequent, most of the crops have also entered the vigorous growth period or maturity period. However, strong winds and heavy rain weather will not only cause water accumulation in the field, suffocation of roots, and reduction of stars, but also cause problems such as crop branches slightly light, field blockage, poor wind, and light plant feet, and will also cause large-scale soil loss, plant falling, mechanical damage, flower and fruit failure, and rotten seedling death.

So in the rainy season, how do we farmers manage the crops in the field to minimize the loss? Today, I will tell you in detail about the agricultural technology backpack. The weather changes during the summer rainy season.

For this reason, no matter what crops are planted, many farmers must keep abreast of the weather changes in the next 1 or 2 weeks by reading the weather forecast and checking the weather news every day, and prepare for wind, rain, heat and disease in advance.

Before the rainy season or before the wind and rain, the farmland planted in the open air should be dug in the field in advance to make the ditch smooth and drain smoothly. For plastic greenhouse farmland, it is necessary to check the shed wall and shed film in advance, repair the damaged parts in time, repair the internal and external low places, and prevent rainwater from pouring into the shed, especially the slope of the wall at the back.

In the case of new seeds, sprouts and vegetables that are easy to fall, in order to prevent wind and rain erosion or soil moisture is too high and fall, it is necessary to do a high soil cultivation before rain. This will hold the plants in place well and prevent them from falling. In the summer, when it rains, it is very windy and windy.

In order to prevent wind and rain from blowing up the diaphragm through the stomata or spraying the plants and eggplant fruits of the crop directly, all stomata must be closed in advance for protection before the wind and rain arrive.

In order to prevent sudden changes in weather, inconvenient environment, high temperature transpiration after rain, soil intensification, etc., it is recommended to set up awnings or awnings in advance before the rain stops, and direct sunlight after the rain. In particular, vegetables and seedlings should be well protected and managed in this regard.

Because when sowing after rain, it is necessary to use the good humidity caused by rain. When sowing or accelerating sowing, soil moisture should be used in time to maximize the germination rate of seedlings, so as not to delay sowing and not affect growth and maturity. Crops.

For fields without irrigation, sowing crops after rain is simply using rainwater to sow crops on time in a hurry.

Seeding after rain is conducive to seed germination, and the primary condition for seed germination is to absorb enough water. Only when the seeds absorb enough water can they be conducive to germination, another reason is that vegetable seeds are generally only sown to a depth of one to two centimeters, and it is easy to wash the seeds out before rain.

Because vegetable seeds are generally sown only one to two centimeters deep, it is easy to wash out the seeds when sown before rain, and even if they are not washed out, the soil moisture is too large, which is not conducive to germination.

Photosynthesis must be under light to take place, so the intensity of photosynthesis increases with the increase of light intensity within a certain range; The respiration of plants is affected by temperature, the concentration of oxygen and carbon dioxide, light, etc., and within a certain range, low temperature can inhibit the respiration of plants and reduce the consumption of organic matter in plants. Therefore, when vegetable farmers plant greenhouse vegetables, the light can be enhanced during the day, and the photosynthesis can be enhanced, and the temperature can be reduced at night and night to weaken the respiration of plants and reduce the consumption of organic matter, thereby increasing the accumulation of organic matter and improving the yield of vegetables

So the answer is:

Answer d Because light is the condition for the synthesis of light and locust flowers, and the light is not strong on cloudy days and rainy days and spring snow, the intensity of photosynthesis will be weakened, and the organic matter synthesis will be less, so the yield will decrease.