Protecting the garden from spring frosts
Spring frosts (temporary lowering the temperature below O ° C on the soil surface and in the air) are:
most dangerous spring frosts during the period with an average daily temperature of 5-10 ° C. Radiation frosts occur in the windless night in the absence of clouds, occur frequently and are short-lived. Advective arise during the invasion of cold masses "of air from the northern regions (more persistent and harmful) most dangerous mixed frozen -.. al-convective-radiation flowers of most fruit trees damaged at -2,2 ° C and fruit zavyazyvashiesya. - at -1,1 ° C Heavily damaged flowers and tie the fruit crumble, from the partially damaged develop deformed fruits (shallow and one-sided)
late spring frosts often coincide with the beginning of the flowering plants and the formation of the fruit:
flowers in bud stage.damaged at -3-4 ° C;
blooming flowers are damaged at -2-3 ° C;
fruit ovaries are damaged at -1-2 ° C
signal for the start of the protection of gar
preventive and straight.
By preventative methods to combat include the selection of breeds and varieties, and their rational allocation with strict regard to climate (in a rugged relief).By direct protection methods include:
construction of various cultivation facilities,
whitewashing of trees,
use of various chemicals (plant growth regulators),
direct heating devices and special devices.
for cultivation facilities and shelters use different svegoprozrachnye and milky-white polymer films.They are used to protect the strawberry planting, various ranotsvetuschih berry bushes and fruit trees on dwarf rootstocks.To reduce the risk of frost damage to plants can be offset flowering phase, that achieved with a solid whitewashing of fruit trees, milk of lime or polymers.
most common and affordable way to protect the garden are smoke screens, which use pre-prepared smoke heaps of organic materials: rotten straw, branches, firewood, peat, leaves, etc., which give a large amount of thick smoke, as well as special neutralsmoke bombs.Smoke heap and checkers are lit on the leeward side of the garden with decreasing temperature, and continue to fumigate another hour after sunrise.Dymlenie effectively with weak frosts (to -2 ° C).special heating devices with oil, coal, resins used for outdoor heating.To combat the short-term frost irrigation and sprinkler irrigation is used, effective at -3-4 ° C.The water, having a high specific and latent heat when freezing produces heat (1L releases 80 kcal).Therefore, when watering the garden before frost temperature difference may reach 2-3 ° C, this is enough to protect the flowers from being damaged.An even greater effect is achieved by using irrigation through the trees prior to the frost flowers.Sprinkler irrigation start by lowering the air temperature in the morning to 2-0 ° C and is stopped when the ice melts in the trees.During spraying the protective ice to remain wet.A break in the sprinkling during freezing leads to the death of the flowers.Irrigation can be stopped only by increasing the temperature to 3-4 ° C.