At present, wheat is in the period of jointing and booting, and it grows rapidly. It is extremely vulnerable to low temperatures and cold, and it reminds farmers to take precautions against cold damage.
Measures to prevent cold chilling:
1. Watering. Maintaining adequate soil moisture and moist microclimate in the field is of great significance for preventing cold damage. Drought will increase the freezing damage of wheat. Because the heat capacity of water is larger than the heat capacity of air and soil, watering before the cold current can regulate the microclimate near the ground floor, increase the moisture in the air near the ground, release latent heat when the condensation occurs, and reduce the variation of the ground temperature. It has a good effect against cold chilling. At the same time, after the irrigation, the soil moisture increases, the soil thermal conductivity increases, the soil temperature increases, and the cold damage is reduced.
2. Spray plant growth regulators. Plant growth regulators have the ability to maintain the stability of plant cell membranes, activate vitality of plant life, enhance plant immunity and resist various kinds of disasters, and can quickly repair the damage caused by various disasters to crops, and have a significant effect on the defense against low temperature and cold damage of wheat. . After spraying, it can effectively prevent the harm of low temperature, “cold spring†and early frost, and timely spraying after the occurrence of frost damage has obvious effects on relieving freezing damage and repairing damage.
Remediation measures after cold damage:
If cold chilling occurs, it is necessary to remediate in time. The main remedial measures: 1. Rejuvenation and watering. Immediately after cold damage, wheat can be quickly applied nitrogen fertilizer and watering. The coupling effect of nitrogen and moisture can promote the development of small tillers, improve the percentage of tillers and spikes, and make up for loss of main stem. Generally, about 10 kilograms of urea is applied to each acre.
2. Foliar application of plant growth regulators. After the wheat was frozen, timely spraying of plant growth regulators such as Tianda Aiduoxin had a significant effect on the recovery of wheat, which was manifested by the rapid growth of medium and small tillers and the rapid growth of latent shoots, which significantly increased the number of wheat spikes. The number and 1000-grain weight can significantly increase wheat yield.
3. Control pests and diseases. After being chilled and chilled, wheat suffers from low disease resistance and is prone to pests and diseases. It should be sprayed with pesticides in time to prevent pests and diseases.
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