Rape leaves slightly frozen without serious problems
Around 20th of November, there was a large-scale cooling process in our province. In some regions, the minimum daily temperature dropped to around 0°C, and a relatively serious frost appeared. This caused some freezing damage to rapeseeds and wheat in some plots, especially seedlings. The dry soil of the soil is seriously affected. The rape reflected in the text message may be subject to frost damage if symptoms of damage are concentrated in a short time after the low temperature. If the seedlings are larger, only the peripheral leaves are affected by freezing. If the seedlings are small, the soil is dry, and when it is heavily frozen, it will have certain adverse effects on its growth. Severe diseases may cause dead seedlings. If conditions permit, it can drown the damaged rapeseed field and increase the soil moisture, which will help to reduce the freezing of dead seedlings. In the absence of irrigation conditions, roots may be properly planted, or covered with grass cover seedlings. Spraying potassium dihydrogen phosphate and humic acid foliar fertilizer on the affected rapeseeds will help improve the frost resistance of rape.
Reminder: In previous years, temperatures in all parts of the province were generally high, and rape and wheat that had not undergone low-temperature exercise were weak in cold resistance and were vulnerable to sudden frost weather. After cold exercise, its cold resistance and antifreeze ability will be significantly enhanced. In recent rape and wheat, the site conditions (eg, topography, soil moisture, etc.) are more likely to cause frost hazards, and the seedlings are also more susceptible to freezing. Protection should be taken and the seedlings must be kept safe for winter.
Downy mildew is prone to occur under conditions of low temperature and high humidity, and its occurrence usually takes a long time. On the diseased leaf, water spots on the leaves first appeared, then yellowed and enlarged. Before the occurrence of frost damage, low temperatures must pass and suddenly occur after the low temperature. The frozen leaves first had large areas of icing and dark leaves. After thawing, they looked like scalded scalded water stains. After dehydration, the dried leaves turned white. The light leaves yellowed. The frozen part of the frozen rapeseed leaves will lose a lot of water. If the seedlings are small at this time, the root system will be less and the distribution will be shallow. The soil in the field will be arid and the seedlings will die due to physiological water shortage. This is often referred to as “dry freezingâ€. seedling. It is beneficial to protect the seedlings in order to avoid severe cold damage during the wintering period.
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