After the Spring Festival, the temperature began to gradually rise. The winter greenhouses in the sunlight and vegetables are in an important period of growth. The vegetable farmers should grasp the following key technical measures.
First, regulate temperature
In early spring, the temperature changes greatly, and management is mainly based on reasonable temperature control. To regulate the indoor temperature through reasonable ventilation, the daytime indoor temperature of vegetables such as eggplant and pepper should be controlled at 28°C-30°C and 14°C-16°C at night; tomatoes, zucchini, and other vegetables should be controlled at 25°C-28°C during the day and 12°C at night. -14°C. When the temperature in the tomato shed rises to about 28°C, it starts to release air. Generally, the top wind is taken and the air volume is gradually increased as the outside temperature gradually increases. Before 4-5 o'clock in the afternoon, before the outside temperature drops, cover grasshoppers in time to ensure that the greenhouse temperature is always maintained within the range suitable for growing vegetables. When the temperature in the shed is not high or when the wind blows during the day, do not ventilate or release the air. In the event of rain, snow or strong winds cooling down the weather, necessary temporary warming measures should be taken to prevent the temperature from being too low, but the night temperature should also be prevented from being too high, so as not to cause the seedlings to grow. When the temperature is too high at the later stage, the bottom wind can be used. When the minimum temperature reaches 15°C or above at night, the grass is no longer covered, and ventilation is provided day and night.
Second, scientific watering
In early spring, due to the low outside temperature, the ventilation volume in the greenhouse is small. Therefore, the timing, time, frequency, and watering mode of watering should be taken into account during management. In the greenhouse covered with plastic film, watering is best to use the film under the dark irrigation or drip irrigation, pouring small water, can not flood irrigation.
Watering time depends on the weather, ensuring that there are 2-3 fine weather after watering. You should try to choose sunny day in the morning, and the amount of watering depends on the weather, plant growth, and soil moisture. Watering in early spring need not be too diligent in order to prevent excessive humidity from causing the occurrence and spread of disease. After mid-to-late March, as the temperature rises and the plant growth speeds up, the amount and times of irrigation can be appropriately increased. Generally, after the watering, the greenhouse film should be closed to increase the temperature inside the greenhouse. After the ground temperature rises, ventilation and dehumidification will be carried out in time, which will help the plants grow robustly and suppress the occurrence of diseases and insect pests.
Third, windproof
In spring, wind, wind, and sand storms may also be accompanied, so it is very important to do a good job of windproof work to protect the film and skeleton. Especially in the case of windy weather with high wind level, if the film is not firmly fastened, it will often be torn by strong winds. To this end, pay attention to listening to the weather forecast. Before the advent of strong winds, secure the scaffolds, secure the membranes, inspect the sheds for damage, and identify any problems that may arise as soon as possible.
Fourth, improve lighting
One is to extend the lighting time as much as possible and increase the light intensity. Under the condition that the temperature in the shed is guaranteed, whether it is sunny or cloudy, grasshoppers should be as early as possible. éç € ? 垦 垦 垦 垦 ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ ã¥é”¬è°‘åŸ é¦ ? ? ? ? ? ? 潜 潜 潜 潜 3 趾 趾淼 禾褰å³åŸ‚ 禾褰å³åŸ‚ è‚· è‚· =è‚· è‚· 㶠笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 笃诘 ψ龊 ψ龊 ψ龊 ψ龊 èˆ èˆ èˆ èˆ èˆ èˆ èˆ èˆ èˆ ã·é³Ž 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212 212龋 跎傺 跎傺 跎傺 窒 窒 窒 窒 ? ? å…± å…± å…± å…± β β BR BR BR
Fifth, timely fertilizer
While appropriately increasing the number of times of watering and watering, the fertilizer is applied once every 7 days in combination with watering (the cucumber may be applied once every 3-5 days). Fertilizer should grasp the principle of “a small number of times†and apply appropriate phosphorus and potassium fertilizers to improve the plant's resistance to stress and improve quality. At the same time as the root application, foliar spray fertilizers may be used, such as spraying 0.2%-0.3% urea solution or potassium dihydrogen phosphate solution.
VI. Pest Control
With the increase of temperature, pests and diseases of vegetables in solar greenhouses will also occur. For the prevention and control of various pests and diseases, we must actively implement the plant protection policy of “prevention-oriented, comprehensive prevention and control†and carry out targeted prevention and control. It is necessary to pay attention to the use of high-efficiency, low-toxic, low-residue pesticides to control the spread of pests and diseases.
Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent. Terrestrial plants may be grown with only their roots exposed to the mineral solution, or the roots may be supported by an inert medium, such as perlite or gravel. The nutrients in hydroponics can come from an array of different sources; these can include but are not limited to waste from fish waste, duck manure, or normal nutrients.
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JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com