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1 The cold bed is the simplest nursery bed. The construction method of the cooling bed is simple, labor saving, material saving, and low investment. However, due to its heat energy only from the sun, so the warming, insulation effect is poor, bed temperature is often subject to temperature changes. Melon cultivation generally uses cold beds in combination with other protection facilities such as greenhouses. The use of a cooling bed in combination with a shed is even more simple. It is a small shed-type cooling bed with no earth walls required. The seedbed width is 130 cm, and the length is determined by the area of ​​the melon field. The depth of the cockroach is 20 centimeters. The bottom of the coffin pit should be leveled and compacted. A layer of sand with a thickness of 2 to 3 centimeters should be spread over the surface to fill in nutritious soil or make nutrients. Small sheds were added to the seedbeds. The sheds were covered with agricultural plastic films. Solar radiation was used to increase the temperature of the beds. At night, straw curtains were used to cover the heat outside the agricultural film.
2 Biological brewing hotbed At the bottom of the cold bed, dig deep 12 to 16 centimeters of pit, padding about 10 centimeters thick tepid material, and increase the bed temperature by releasing heat energy from microbial decomposition of organic matter. Padding with brewing materials should be noted: the brewing of hot materials should use fresh manure, garbage, withered and fallen leaves, high-calorie horse dung, garbage should be mixed with low calorie cow dung and fallen leaves; the broilers should be used before use. 1 week to enter, because it takes a certain time after filling to heat, and prevent bed soil subsidence; heating materials should be divided into 2 to 3 layers of practical, moderate elasticity, moderate moisture, and add a certain amount of nitrogen nutrition, such as 0.5% Ammonium bicarbonate allows microbiological activity with suitable air, moisture and nutrient conditions. Humidity should be about 70%, such as dry brewing materials should be used after soaking, or to add appropriate amount of human waste; padding when the grass should be mixed evenly, but also a layer of grass a layer of manure pad; Lay a layer of 5-7 cm fine soil as a buffer layer, and then drain the nutrient pods or nutrient blocks to prevent the young roots from penetrating into the zeal. With the improvement of production conditions, the practical application of this type of hotbed has been limited, and it is only applied in remote areas.
3 Electrothermal hotbed In the culture soil of the nursery cooling bed, an electric heating wire is uniformly placed underneath, and electric heating and sunlight are used to increase the temperature of the seedbed. The operation is simple and the temperature control instrument can be used to control the temperature freely according to the need. The temperature distribution in the seedbed is uniform and constant. Bringing early seedlings. It can be used in any area where 220 V AC can be guaranteed. At present, it has been widely used in the suburbs of major cities.
The power used per square meter of cantaloupe seedlings is 80 to 100 watts in the north and 50 to 70 watts in the south. The DV series electric heating lines produced in Shanghai use 800 to 1000 watts each and the wiring pitch is 10 to 13.5 centimeters. Before the wiring, lay a layer of 10cm thick sand or fine soil as the heat insulation layer at the bottom of the raft. Insert a row of wooden rods or bamboo sticks with a fixed heating wire 10 centimeters from the end wall at both ends of the seedbed. The length is 20 centimeters. , insert half the insulation. Due to sunlight and nighttime cooling, the seedbed temperature is often high north to south, so the distance between each row of wood sticks should be controlled by the northern rarity. After the sticks are inserted, they can be wired. The electric wires must be straightened and tightened. They cannot cross or overlap. The incoming and outgoing wires should be arranged at the same end of the seedbed and connected to the temperature controller for easy management. After the wiring is over, sprinkle a thin layer of fine soil on the top. The thickness is based on the non-visible wire. Then you can try to heat it by electricity. If the inspection result is normal, you can turn off the power and put nutrition. You must pay attention to safety, and manage the seedbed. Turn off the power during the process to prevent electric shock.
4 Fire hoeing seedlings Fire cultivating seedlings is to set fire paths at the bottom of common cold beds, build a cornice at one end of the seedbed, and burn coal or firewood, and temporarily increase the seedbed temperature as needed. The temperature of the fire pot seedlings is easily regulated, and the seedlings can be greatly advanced. However, the construction is more troublesome and the angle of the fire line is not easy to grasp. Therefore, the temperatures in the seedling beds are often different in different degrees. Therefore, it is only suitable for use in areas where there is a certain degree of construction and management experience, and where power supply is not guaranteed, in early spring.
5 greenhouses and greenhouses nursery cooling beds, hotbeds of small volume, poor insulation effect, seedbed management difficulties, in order to further improve the insulation performance, can be combined with solar greenhouses, greenhouses. The cooling bed or hotbed is set in a greenhouse or a greenhouse, and the straw is covered with two or more layers to increase the insulation capacity. The daily average temperature and minimum temperature of greenhouse sheds are 3~5°C higher than that of small sheds. Due to the large volume and relatively stable temperature, in particular, it can prevent nighttime temperatures from being too low and the impact of freezing damage. Vegetable greenhouses and greenhouses can be used in vegetable production areas. Comprehensive utilization of production gaps. In some places, this method is used for industrial seedlings and large-scale seedlings for melon production are supplied.
Muskmelon Seedling Seedlings
In order to facilitate the centralized management and promote the orderliness and robust growth of seedlings, the melon melon cultivation generally adopts nursery seedlings. The following five kinds of seedbeds are used mainly in various places.