Since the beginning of spring, long-term low temperature and rain, especially the severe low temperature of minus 3 to minus 6 degrees on March 10, has caused serious impact on potato production. The sprouts of open-air cultivated potato stems and leaves have all been frozen and their buds have suffered. Different degrees of frost damage. From the analysis of the degree of frost damage, the multi-span greenhouses are superior to greenhouse cultivation. The cultivation of greenhouses is superior to the flat-covered and low-arched lids, and the flat-covered low-arched lids are superior to the flat lids. According to preliminary analysis, the output loss of the spring potato will reach more than 20% this time, and the time to market will be delayed by more than 10 days. According to the current situation of the disaster, the author puts forward the following management opinions:
1, timely rupture of membrane emergence. With the temperature rising, the climate under discontinuous rain, the potato has entered the peak of emergence. Membrane emergence must be broken in time to prevent high-temperature injury seedlings, to prevent frozen stems and leaves rot, affecting the growth of new shoots.
2, Qinggou drainage. At present, many high-level groundwater in the potato fields is blocked. The growth of the potato is very unfavorable. The debridement should be taken care of and the depth of the main trench should be 30 cm. The depth of the trench should be 20 cm.
3. Use topdressing with caution. As a result of frost damage, some farmers are only afraid that the potato will not be sufficiently fertilized. This practice is not allowed. Because the current potato field is not lack of fat, make-up top dressing without any benefit. In addition, when the growth of stems and leaves shows symptoms of lack of fertilizer, they can make up the dressing.
4, to prevent re-"cold winter" frost damage. By the end of March, there was the possibility of another "cold spring". If serious frost damage occurs, the consequences will exceed the frost damage. The potato farmers should have preventive measures. Yesterday, the weather forecast, the afternoon of the day before the arrival, can be timely covered with straw and other coverings. The second is the use of a low-thick film cover. The third is the application of potassium dihydrogen phosphate two or three days before the low temperature. Enhance plant resistance to cold.
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