The temperature difference is large and the rain is heavy: the environment inside the shed should be adjusted
When the temperature in the shed exceeds 35 °C, it is necessary to find ways to reduce the temperature inside the shed. Under the premise of increasing the venting opening, the shading net, the operation of covering the crop straw, and the watering can be solved. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Retractable Cable Reel,Portable Water Hose Reel,Retractable Water Hose Reel,Retractable Electrical Cable Reel NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.water-hose-reel.com
First of all, set the shade net to cool down on the roof. Pay attention to the coverage time of the shade net from 11:00 am to 2:00 pm, avoiding full-day coverage, so as not to affect the normal photosynthesis of vegetables. The basic principle is: sunny cover, rainy days do not cover; noon cover, morning and evening do not cover. Shading nets are used differently depending on the crop planting. For example, if the tomato is light, the cover time should be about 4 hours around noon; and the sweet pepper is light and weak, and if it happens to encounter the hot season of the autumn tiger, the cover time can be extended.
Secondly, the operation line covers the crop straw. Some vegetable growers have increased the air vents and set up shade nets, but sometimes they can't lower the temperature inside the shed. It is recommended that the vegetable farmers cover the crop straw in the vegetable operation line, which not only avoids the rapid increase of the ground temperature, but also reduces the evaporation of soil moisture and avoids the spread of weeds, germs and the like. After covering the crop straw in the vegetable operation line, the ground temperature can be lowered by 4-5 °C.
2 consecutive weather: heavy fog
Even the cloudy sky must not cover the shade net to ensure the light intensity required for crop growth, avoiding weak light, making the photosynthetic products less synthetic, resulting in weak plants, small fruit or no fruit. At the same time, we must also do a good job in moisture control.
First of all, pay attention to enhance the illumination in the shed in the continuous cloudy sky. Seedlings that have not yet been planted are very concentrated and have a limited footprint. Artificial light supplementation is necessary and feasible. It is necessary to pay attention to the selection of suitable fill light, with a special agricultural fill light as well. Such as agricultural sodium lamps, iodine tungsten lamps, rare earth lamps, and the like. The 400-500 watt high-pressure sodium lamp works normally, and the light intensity is about 4000 lux at one meter from the bulb.
If the lighting is seriously insufficient, the spotlight cover can be used together. It is also necessary to pay attention to the fill light time. The effect of winter fill light has the rule that “long-term weak light is not as good as short-time strong lightâ€. It is recommended that when the vegetable growers fill the light with cloudy days, they should choose the day before noon and the time when the light in the shed is the strongest. The seedlings that have been planted have large distribution area and poor artificial light-filling effect. The surface of the greenhouse can be improved by removing the cooling agent from the surface of the shed film, wiping the shed film in time, and suspending the reflective film.
Second, proper control of temperature, especially night temperature, minimizes the consumption of photosynthetic products. High temperature at night and vigorous breathing will consume more photosynthetic products, resulting in high seedling height, yellow leaves and long length. Therefore, do not blindly keep warm in the management, especially some new sheds with good heat preservation, with a night temperature of 10-13 ° C and a daytime temperature of about 25 ° C.
3 even cloudy and sunny again: to prevent wilting
After a cloudy day, the plants often wilted. The direct cause is that the loss of water is greater than the absorption, resulting in water shortage of the plants, the leaves of the plants are wilting and curling, and in severe cases, the leaves are dry and dead. After the sunny day, the temperature rises rapidly, especially when the temperature exceeds 35 °C, the air humidity in the shed is rapidly reduced, so that the delicate growth point can not withstand the high temperature, and the water evaporates in a short time, causing bad head.
Therefore, the main way to prevent this problem is to reduce water loss and coordinate the balance of water in the plant. In the rainy days, the light is weak, the amount of water evaporation is small, and the water absorption of the roots is also reduced. The weather suddenly cleared, and the evaporation of leaf moisture suddenly increased, and the water absorption of the root system could not be quickly adjusted. It could not immediately meet the water demand of the plant, which caused water loss and wilting.
As long as you start from these two aspects, you can solve the problem.
First, reduce the light intensity, and clear it after continuous rainy days. It is recommended to lay a sunshade net or splash mud, ink, etc. on the film to minimize the light intensity, so that the plant has a slow adaptation process, and the evaporation gradually increases.
The second is to spray clean water in the shed to increase the air humidity, thereby reducing the water evaporation of the leaves. When spraying water, it is recommended to add 3-5 pieces of aspirin to the sprayer, which can promote the pore closure and also reduce the water transpiration loss of the leaves. For the wilt leaves, it is recommended to spray the foliar fertilizer in time to promote the recovery of the leaves as soon as possible.
4 rainfall weather: heavy anti-high humidity
First of all, it is necessary to prevent rainwater from shed. Vegetable farmers should develop the habit of watching the weather forecast. Before the heavy rain comes, close the air vents and prevent rainwater from entering the shed. If the protection is not proper, after the rainwater is irrigated, the water in the shed should be quickly discharged. When the soil sees dryness, it should be ploughed in time, loosen the soil, and increase its permeability to prevent rooting or root disease. After cultivating, it is best to apply a fertilizer that roots the roots, if it is beneficial, to promote the growth of vegetable roots.
Secondly, the humidity in the shed is large, and attention is paid to disease prevention. In the rainy season, the humidity in the shed is high, and the high temperature and high humidity environment is easy to induce disease. In addition, before the rain comes, close the tuyere, do not operate too early, the front vents can be kept open without water, and all the vents should be opened immediately after the heavy rain to reduce the temperature inside the shed. The temperature of the shed is consistent with the outside temperature, which is an effective measure to reduce nutrient consumption.
In addition, proper fruit thinning, reducing the retention of flowers and flowers, can also reduce nutrient consumption, which is conducive to balanced nutrition distribution. Before the rainy weather arrives, it is recommended to use roots such as ricotta to root the roots, increase root activity, increase nutrient absorption, and increase plant resistance. After the rain, foliar application of amino acid gold plate or photosynthetic power foliar fertilizer directly supplements the nutrition through the leaves, delaying the aging of the leaves.