After entering the winter, protecting vegetables and fruit trees for safe wintering has become a top priority. Recently, most cities in China have experienced haze and cool weather, especially in Shaanxi, where it is expected that the coldest weather since 1992, local snowfall, ultra-low temperature duration of 4-6 days, frost defense work is urgent to do peach frost damage.
First, peach frost damage
1, different crop varieties, different cold resistance. For example, jujube trees that grow robustly can withstand temperatures as low as -20 to 30°C. Grapes can only tolerate temperatures as low as -10°C, whereas subtropical evergreen trees such as citrus are frozen at -5°C.
2, storage nutrition is vulnerable to cold. The nutrient reserve of the tree promotes the conversion of starch to soluble sugar under low temperature conditions, the concentration of cell fluid increases, the water potential decreases, and the excessive water loss of the cells is inhibited, so that the freezing point is reduced, and the protoplasmic colloids are also protected from freezing and solidification. Excessive results, too many branches and late nutrient supply are not timely, autumn leaves fall back to the tree after the lack of nutrients, resistance is poor, easy to be frozen.
3, the amount of nitrogen fertilizer is too much, the plants are long, the cell wall is thin, the cell fluid concentration is low, the plants are soft, and the cold resistance is poor.
Second, the physiological changes after freezing crops
After the plants are frozen, the leaves resemble a scald. The cells lose their turgor, the tissues are soft, the leaves become brown, and eventually dry and die. Sudden cooling causes the cell gap and even the intracellular ice to become large, and the volume of the cell becomes large, which damages the cell membrane and causes dehydration, mechanical damage, and penetration. The branches showed death from the inner shoots, edema and browning of the bark at the base and stem.
Peach bark is thin, when the cold current comes, it is easy to freeze the bark or even dead trees. In order to solve the problem of freezing injury, it needs to be prevented in time, and less frost damage will reduce the occurrence of peach gum disease.
Third, peach tree antifreeze measures:
"Coughing Corruption" - Chinese (Grass) medicinal preparations, with the characteristics of wound repair, conditioning growth, bactericidal broad-spectrum (conduction sterilization, direct sterilization), crop safety, etc., good for infective and physiological mixed diseases The control effect. Its usage includes branch painting, root irrigating, and high-concentration spraying in clear gardens. Brown sugar: supplements amino acids and other nutrients. Silicone: Increased permeability. S. blight: Promote rooting, stabilize roots, and enhance plant resistance. Vervoline: Supplements nutrients such as amino acids to improve crop resistance.
Recommended program:
Corruptive rot 100 times + Wofengsu 600 times + brown sugar 100 times + silicone 3,000 times to dry 2-3 times. Before going to deciduous; Scutellariae 200-300 times + Wofengsu 600 times to root 1 time.
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