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Temperature Considerations during Plant Propagation
from:For successful propagation, temperature should limit the strees on developing propugale.Very high temperatures or very low temperatures may limit and affect rate of development of propugale. See to that there is no excessive water loss. Light levels should not go beyond the desired range. Excessive water loss may result into death of propagule
Temperature
The ideal temperature varies with plant species. Air temperature should be between 70 to 85 Fahrenheit. Soil temperature should be between 70 to 75 Fahrenheit for plants that are grown during temperature climates. Air temperatures should be controlled. There should be high light intensity and ventilation must be provided during winter and summer days. Enclosed structure can be ventilated by active and passive means. Active means involves use of fans. You can also use fans that pull air through moistened pads. Such fans provide a cooling effect. Passive ventilation makes use of a principle. We all know that if the air is hot, it rises. The structure is designed in such a way that the hot air can easily escape through a vent in the structure
During winters you should add heat to get the optimum temperature. By doing this
cold injury to the plant is also minimized. The approach to protect the plants from cold varies with the kind of crop and type of climate in which plants are grown. It is economically viable to give optimum temperatures in warmer climate. In winter, it may be viable to maintain the temperatures above those that cause injury.
You can also add heat to the entire air volume of structure. You can do this by heating the soil. By doing this, the heat rises into crop canopy. Air temperatures that are 2 feet above crop are lower than desired. Air temperature that is around plants is in required range. Heat can also be given to the root by many innovative ways.
Methods such as in bench heating and below bench heating are well known. In in-bench heating, warm water is circulated through polyvinylchloride pipe.Sometimes heating cables are also used. Various arrangements of shields are used that reduce heat loss from crop area. In a greenhouse, overhead plastic shield, called a thermo blanket is used. It minimizes heat loss from crop zone.
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