In order to prevent freezing injury in rapeseed production, we must first select varieties with strong cold resistance; secondly, we should reasonably arrange sowing dates according to the characteristics of varieties. Early sowing and early planting of varieties with stronger winter may increase dry matter accumulation and achieve early growth of strong seedlings. And improve the ability of frost resistance. At the same time take the following technical measures to prevent freezing damage.
The topdressing Miaofei should seize the opportunity to pursue Miaofei, especially the late planting seedlings and live seedlings later, should pay close attention to cultivator loose soil, fertilization, thinning, filling the seedlings, in order to promote the rape before the vegetative growth, forming a strong Root system. During the seedling stage, the application of phosphorus and potash fertilizer should be increased, and the application amount of nitrogen fertilizer should be appropriately controlled or reduced so as to prevent the plants from being tender and juicy, and the cold resistance being deteriorated.
The cultivating soil bacon height is generally suitable to the first leaf of the base, which can not only loosen the soil and increase the soil temperature, but also can directly protect the root, which is beneficial to root growth and prevent root extraction.
It is best to fill the winter water before filling winter water. Pre-winter irrigation can reduce the temperature difference between day and night, improve the microclimate in the field, ease the cold attack, and prevent dry frozen seedlings. Overwintering water should be poured and perfused.
The removal of early bolting early winter rapeseed rape must be removed before the beginning of spring in order to reduce frost damage. After picking, a fast-acting nitrogen fertilizer must be topdressed so that the plant nutrients can be compensated to promote its recovery and promote branching. , increase the number of pods.
Re-applied wax fertilizer can be added in the rapeseed rows of miscellaneous fertilizer, ring fertilizer, human waste, turfgrass and other fertilizers, can increase the ground temperature 2 ~ 3 °C, play a cold and warm effect, but also can play winter fertilizer spring Effect. Http://
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