Vegetables in the summer to prevent three natural disasters

Vegetables can supplement a large number of vitamins that are missing in the human body. In the process of vegetable cultivation, there may be some natural disasters. If it is light, it will reduce production, but it will not be harvested. This article will introduce you to the three natural disasters that should be guarded in the summer.

rainstorm

Hazardous impacts after sowing, the seeds are washed away to the bottom of the ditch or exposed to the soil surface, resulting in lack of seedlings. After the emergence of the seedlings, the topsoil was washed with heavy rain, causing the roots to be exposed, and after sunning, the vegetables were wilted and dead. All kinds of vegetable seedlings are damaged by heavy rain machinery, which will lead to a decline in growth, a decrease in production, and a small amount of listing, which will result in a phenomenon of “low prices and low prices”.

The first defensive measures are to vigorously build water conservancy, dredge the river channel, reinforce the river bank seawall, transform the easy land, implement deep ditch and sorghum farming, plant trees to maintain water and soil, and the fields and ditches are connected by ditch and drainage. Second, when it is rainy, it is necessary to drain the drainage or mechanical drainage in time. The flooded plants should wash away the sludge on the stems and leaves in time to remove the yellow rotten leaves and straighten the plants. After the soil is slightly dry, it will be ploughed and soiled in time. The third is to deep-plow the soil and apply more organic fertilizers, which can improve the physical properties of the soil, improve the water seepage capacity, and have a certain effect on reducing the rain and wet damage.

high temperature

Harmful high temperature heat damage has adverse effects on vegetable growth and yield formation, and is the basic reason for the formation of vegetable supply “autumn”. For example, when the tomato encounters the above table temperature above 40 °C in the early flowering stage, it will cause the flower to fall. The longer the duration, the lower the fruit setting rate; the pollination rate of the bean is higher than 30 °C; the cucumber is not conducive to fruit growth above 32 °C.

One of the defensive measures is to plant heat-resistant vegetables in summer, such as melon, loofah, cowpea, and spinach. In the cold mountainous areas with high altitude (above 600 meters), the summer high-temperature off-season replenishment production base is established, and the high-stalk crops are shaded and cooled, such as eggplant and sweet pepper. The second is to timely water, cooling and cooling by evaporation. Sprinkler irrigation is best in high temperature and dry seasons, but watering should be avoided at high temperatures around noon, because sudden cooling will cause physiological obstacles to vegetables. The third is to adopt shade cultivation. In the summer, the shade net (cool yarn) is used to cover the cultivation, which can prevent the direct radiation of the sun from burning the vegetables. It can be cooled down by 3 ° C to 5 ° C in the open field, which is beneficial to the summer of the summer vegetables. The fourth is to apply a growth regulator to control the falling flower. For example, 2,4-D dipping and p-oxyphenoxyacetic acid spray can prevent tomato and eggplant from falling due to high temperature.

Hot thunderstorm

Harmful in summer, due to strong solar radiation, the ground is rapidly warming up, causing a large amount of hot and humid air to rise violently, often producing strong thunderstorms, which is called hot thunderstorm. It happens mostly in the afternoon, and the more sultry and windless the weather, the easier it is to happen. Hot thunderstorms often bring greater harm, and have a greater impact on cucumbers, eggplants, and leafy vegetables, especially for young vegetable seedlings.

The best way to prevent defensive measures is to water them in time after the rain, and it is better to use sprinkler irrigation. Because the tillage layer can be completely saturated after watering, the water brings in oxygen, and the toxic gas is discharged, the root's breathing will improve, and the water absorption function will increase. After pouring water, the temperature can be lowered, which is beneficial to the growth of vegetables and is not conducive to the propagation of germs. Watering can also be used to rinse the sludge on the foliage, which is good for photosynthesis.

Thin film transistor liquid crystal display, commonly referred to as the TFT-LCD, is a type of liquid crystal display that USES thin-film transistor technology to improve the image quality. Although TFT-LCD is collectively known as LCD, it is an active matrix LCD used in televisions, flat screens and projectors.

Simply put, the TFT-LCD Panel can be seen as a layer of liquid crystal sandwiched between two glass substrates, the upper glass substrates being color filters, and the lower glass having transistors embedded in it. When the current passes through the transistor, the electric field changes and the liquid crystal molecules deflect, so as to change the polarization of the light, and then the polarizer is used to determine the light and dark state of the pixel. In addition, the upper glass is fitted to the color filter, so that each pixel contains three colors of red, blue and green, which make up the video image on the panel.

The Thin film Liquid Crystal Display is a type of most liquid crystal display that USES thin-film transistor technology to improve the image quality. Although TFT-LCD is generally referred to as LCD, it is an active matrix LCD. It is used in TV, flat panel display and projector.

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