Rapeseed damage should be prevented early
Rapeseed is susceptible to freezing damage at low temperatures, especially in rapeseed with good autumn yield. Because of its green leaves and leaves, it is more susceptible to freezing damage at low temperatures. According to the survey, the degree of freezing is closely related to the strength of rapeseed seedlings, topography, soil moisture and quality of transplanting. Early prevention of freezing is the key to obtaining high yield of rapeseed.
Enhance cold resistance
Different measures are taken for different seedlings to ensure that winter rapeseed is the fundamental measure to prevent low temperature. During the wintering process, the leaves of rapeseed are most susceptible to freezing and death, resulting in a decrease in the number of branches after the year, which directly affects the yield. Therefore, we must make every effort to make roots before the year. For the winter before the long seedlings, from the light snow to the winter solstice, the ploughing of the soil between the rapeseed lines is about 10 cm deep, cutting part of the roots, reducing its nitrogen absorption capacity, and promoting the accumulation of organic matter such as sugar in the rapeseed plants to improve cold resistance. ability. Grasping the rapeseed cultivating bauxite to thicken the root soil layer has a certain effect on blocking the cold wind and influencing the heat-absorbing and cold-resisting ability. Especially after the high-footling seedlings are soiled, the shortening of the rhizome is conducive to heat preservation. When entering the cold winter season, especially before the low temperature attack, the quick-acting nitrogen fertilizer should be controlled to control the growth of the nutrient area of ​​rapeseed, so that the waxy layer of rape leaves accumulates, which is beneficial to cold resistance.
Early weight application
Increasing the amount of phosphorus and potassium fertilizer in the wax fertilizer can play a role in increasing the thickness of the wax layer of the leaf. It is best to apply the wax fertilizer before the cold wave. In the early winter, the application of organic fertilizers such as pig manure or soil fertilizer between the rapeseed lines can increase the ground temperature by 2-3 °C, and it can also be used as a spring effect. It is advisable to apply 1000-1500 kg of pig manure or 90-2500 kg of soil fertilizer. Potassium can increase the concentration of cell liquid and enhance the cold resistance of cells. Generally, 5-8 kg of potassium chloride and 10-15 kg of superphosphate are applied per acre of ditch or hole. The plant ash is rich in potassium and has strong heat preservation. When the weather suddenly becomes cold, other measures can't be implemented. It can spread a layer of ash and wood ash on the leaves and fields of rapeseed, which not only protects the leaves, but also increases the heat absorption properties of the soil and improves the soil. temperature.
Timely foliar spray
Spraying phosphate fertilizer on rapeseed leaves can significantly increase the thickness of the waxy layer of the leaf surface, and the cold resistance effect is remarkable. Generally, due to the low-temperature purple leaves, after spraying the phosphate fertilizer for 5 days, it can be converted into normal green, and can withstand the low temperature attack of minus 5 °C. The specific method is to use 2 kg of superphosphate or 0.5 kg of ternary compound fertilizer per acre, soak it in 30-40 kg of water for one week, then filter out the fertilizer residue, spray it on the foliar surface, spray again every 7 days, spray The focus of the object is the rapeseed field where the nitrogen fertilizer is too heavy to appear green. For the leaner rapeseed, 0.1-0.2 kg of urea can be added to the phosphate fertilizer solution to promote the growth of rape leaves, so as to improve the ability of the leaves to produce waxy layers and enhance cold resistance.
(Cao Dihuan)
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