The weather changes so quickly
Good weather: heavy temperature protection 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. 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 can resist light and light, which can extend the coverage time. Secondly, the operation line covers the crop straw. This will not only avoid the rapid increase of ground temperature, but also reduce the evaporation of soil moisture and avoid the spread of weeds, germs and other diseases. Continuous weather: focus on weak light 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, continuous cloudy sky to pay attention to enhance the illumination inside the shed, artificial light 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. Secondly, proper control of temperature, especially night temperature, minimizes the consumption of photosynthetic products, with a night temperature of 10~13 °C and a daytime temperature of about 25 °C. Even the cloudy day and the next turn: the defense against wilting 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. You can start from the following two aspects: First, reduce the light intensity, and clear it after continuous rainy days. It is recommended to lay a sunshade net or splash mud 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. Rainfall weather: heavy rain prevention 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 to root the roots 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, roots can be used to irrigate the roots, increase root activity, increase nutrient absorption, and increase plant resistance. After the rain, the foliar fertilizer is applied to the foliar surface to supplement the nutrients directly through the leaves, delaying the aging of the leaves. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone dental handpiece high speed,handpiece high speed,high speed handpiece,dental high speed handpiece,high speed dental handpiece Foshan Ja Suo Medical Device Co., LTD , https://www.fjoralinstrument.com