Since the beginning of spring, the overall temperature is high, which is conducive to the transformation and upgrading of weak seedlings. However, the temperature fluctuations are too high and they fluctuate, causing freezing damage to wheat in fields. In particular, the risk of freezing damage that occurs later is greater. Affected by ground troughs and shallow troughs on April 4th, there are sometimes light rains, and southeast winds are around Grade 5; on the 5th to the 6th, due to the combined effect of stronger northern cold air and the development of the southern extratropical cyclone eastward and northward, the whole city There is a small to moderate rain process, accompanied by inland 6-8 grades, and 8-10 grades in the coastal sea to southeast winds. At the same time, the temperature dropped significantly and gradually cleared on the night of the 6th. On the morning of the 7th, the minimum temperature was between 0 and -1 degrees, with frost or frost, and the temperature rose rapidly during the day on the 7th. This has increased the risk of freezing damage to already-jointed wheat.
After the occurrence of low temperatures, it is necessary to check the fields in time and take remedial measures in time. In the wheat field where the frozen mortality rate of stem stems exceeds 10%, timely recovery fertilizer should be applied. Generally, the mortality rate of frozen stems is 10-30% in wheat fields, and 4-5 kg/mu of urea can be topdressed. If the freezing mortality rate exceeds 30% in the stems of wheat field, the mortality will increase by 10%, and the urea needs to be increased by 2-3%. Kg/mu, the upper limit should not be more than 15 kg/mu, and it is possible to strive to shake the birth and post-high-staggering tillering to restore production loss.
At the same time, we must continue to do a good job of other field management work based on increasing production and income. We must focus on the following three aspects for field crop management:
1. For the fields that have not been topdressed in time, they should seize the rainfall process from the 5th to the 6th and follow the joint-stocking and panicle-fertilizer.
2, do a good job in clearing the ditch, enhance root vitality, to prevent waterlogging.
3. Pay close attention to the occurrence of pests and diseases, and do a good job in the prevention and control of late-stage diseases and pests in wheat and rape.
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