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Cold freezing injury in winter wheat rape rape prevention and control of wheat rape
The following measures for prevention of freezing and freezing of wheat in winter include: (1) Spreading warm farmyard fertilizers before the onset of cold waves to protect childbirth from frost damage. (2) irrigation. For the jointed wheat field blocks, it is conditional to irrigate before the onset of the cold wave, and the ground temperature can be adjusted to reduce the freezing damage. (3) Smoke. When the cold wave arrives or after the cold wave occurs, the use of straw, wheat bran, cow dung and other fumes in the field can increase the temperature. (4) Spraying soil surface warming agent and cold-resistance agent to improve cold resistance of plants. Disaster reduction measures include: (1) Timely top dressing. The wheat is not chased after returning to green joint fertilizer, and the fertilizer is applied in a timely manner after the disaster. The amount of urea per hectare is 8 to 10 kilograms. Has been applied after the jointing fertilizer, foliar spray 1% ~ 2% of urea and 0.5% ~ 1% of potassium dihydrogen phosphate mixture 30-50 kg per mu. (3) spraying fulvic acid foliar fertilizer to promote growth. Due to the unusual change in temperature after the first year of the year, the rapeseed in our province suffered from various degrees of frost damage. Heavy rain and snow around March 12 drastically reduced the temperature and caused some damage to rape that had just begun budding and convulsions. However, the duration was short. Most rapeseed leaves were only affected by frozen hair. Therefore, it is necessary to correctly analyze the situation of the seedlings and grasp the defense. Remedial measures to promote transformation and upgrading of seedlings. First, mixed fertilizer spray, disease prevention and pest control. In the middle and late March, rape twitching and early flowering period, the implementation of mixed fertilizer spraying 1 or 2 times, 50 grams of liquid boron fertilizer per acre, potassium dihydrogen phosphate 100 grams, carbendazim 150 grams of water 50 kg, even spray, Plays a role in supplementing fertilizers, preventing flowering but not sclerotinia, and rape sclerotinia. If the weight of rapeseed meal is heavy, it can be combined with 15 grams of aciclovir or a large heroin. In addition, for those who do not chase buds and fertilizers, it is necessary to pay close attention to topdressing, generally 5 to 7.5 kg of urea or 15 to 20 kg of ammonium bicarbonate, plus 7.5 kg of potassium chloride. Second, picking up. For rape with severe wilting of rapeseed, picking alfalfa on sunny afternoon can be selected, and promptly applying topdressing nitrogen fertilizer after picking can help reduce the impact of freezing injury. Third, the ditch drainage, flood control and stain removal. After the spring, timely clear the ditch, deepen the ditch, reduce the groundwater level and the humidity in the field, promote the growth of rapeseed roots well, and prevent the premature decline of rapeseed. This is also an important measure for Tiantan after the snow. 4. Spray plant growth regulator "802". Can play a role in restoring the growth of rapeseed. Fifth, strengthen the monitoring of seedlings. Abnormal climate change in our province, pay attention to weather changes, do a good job of monitoring the seedlings, in the event of low temperature damage should immediately take effective measures to improve the field microclimate, improve the ability of rapeseed frost resistance, reduce the damage caused by frost damage.