How To Heat Vegetable Seedling

Now there is no heating measures of cold bed seedling, mainly the use of greenhouse plus shed or other insulation materials to protect the way of seedling. The heat source of the seedbed comes only from solar radiation, and the temperature of the seedbed is regulated by covering insulation material and ventilation. This method of seedling cultivation is generally in September, October to start sowing, so that the seedlings in the temperature has not dropped to the critical point of growth and development to a certain state. In the extremely low temperature state is only to ensure that the seedlings do not freeze to death, until the next year after the temperature rises, the seedlings with new roots and then transplanted to the field.

If the area is more continuous cold weather, the temperature of the seedbed will drop to a very low (ground temperature <6℃), resulting in root necrosis, it is difficult to cultivate high-quality and high-yield strong seedlings. Therefore, the following artificial heating methods are usually used.

First, electric hotbed in the seedling bed laying electric hot wire, the use of electric energy through the hot wire into heat energy to improve the bed temperature method. In addition to the use of solar energy, mainly through the hot wire, power to control the temperature, but also can be installed temperature control instrument to achieve automatic control of temperature.

The electric hotbed is made by making the seedbed into a low-lying shape. The seedbed is 30 meters long, 90 to 100 centimeters wide and 15 centimeters deep. Lay insulation straw or chaff on the bottom. Two 1000w electric hot wires, 120 meters long, are laid according to the specification of 8-12 cm between each wire. A total of 8 lines are laid. Pay attention to the laying of lines to follow the principle of dense on both sides of the thin middle, strictly prevent the hotline to touch together, the hotline to straighten, and check whether electricity, and then install temperature control instrument or thermometer. After laying, place a nutrition cup on top of the hot wire.

The advantage of electric hotbed is easy to control the temperature, but the disadvantage is that in mass production, it needs a lot of electricity, but also by the trouble of power failure.

Generally speaking, electric heating hotbed is a small area of production (or a special transformer), as a rapid cultivation of seedlings or cold bed seedling supplement. If you have enough power, you can delay sowing tomatoes, eggplants or peppers by a month or two.

Second,this is the use of organic matter fermentation heat to generate heat energy to improve the soil temperature and air temperature of the seedbed. This is usually done with straw (about 2, 000-3, 000 plants can grow on one mu of straw). The concrete method of the material bed is to first use bamboo poles or straw to make a circumference of 60 cm high and 120 cm wide (the length is made according to actual needs), put the straw pile in the material bed, pay attention to the straw should be poured with appropriate water and human excrement or oil dry. When laying straw, we should pay attention to the distribution characteristics of temperature in the seedbed, that is, more straw on both sides, less in the middle. After 48 hours or so, the central temperature of the material temperature rises to more than 30℃, and the surface temperature reaches more than 12℃, the nutrient cup with seedlings can be moved to the brewing hot bed.

Brewing hot hotbed has the advantage of easy materials, and the disadvantage is that the production of hotbed labor time, bed temperature regulation is more difficult and limited heat, after a period of time need to turn the hotbed or replace the straw.

In the actual production operation, the hot breeding bed can be used as a supplement for cold bed growing seedlings. When the cold bed growing seedlings to the extremely low temperature in winter, the seedlings will be moved to the hot breeding bed to prevent the seedlings from freezing damage, promote growth, and achieve the effect of early transplanting and shortening the slow seedling time.

Third,this way of growing seedlings is to use coal-fired boiler steam, natural gas hot air equipment to maintain the temperature in the greenhouse. It is generally produced by professional companies. Its advantages are large heat production, relatively rich sources of hot raw materials, high efficiency and easy to control the temperature. Its disadvantage is that the one-time investment is too high, mainly used for large-scale seedling production and scientific research activities, not suitable for small area farmers.

Greenhouse seedlings can create the most suitable temperature conditions for plant growth, can make it not affected by external temperature changes (or very little influence), especially for tomato early spring deformity reduction is very helpful.