At present, the rapeseed in the southwestern region has been twitching and flowering, and the rapeseed in the middle and lower reaches of the Yangtze River is in the bud stage, which is an important period for the formation of yield. Since the beginning of the spring, there have been low temperature, overcast and illuminating weather in the Yangtze River Basin, causing rapeseed to rise late in spring and slow to grow, and the growth period is delayed by 5-7 days. In order to capture this year's oil harvest, we must seize the agricultural time, effectively respond and promote scientific disaster relief. Specially put forward technical advice on field management in the middle and late stages of rape.

(1) Clearing the ditch in time, increasing the temperature and reducing the stain.

This spring, there are many low-temperature and rainy weathers, especially in recent rains. It is necessary to grasp the weather clearing gap and clean up the field ditch in time to ensure that the “three ditch” is unblocked, so that there is no dark stain on the plough layer, no clear water in the ditch, and prevention of waterlogging. Harm, increase soil temperature and promote the growth and development of rapeseed. The soil culture of the ditch is on the edge of the rapeseed line to improve the resistance of the rapeseed.

(2) Strengthen monitoring and control of pests and diseases.

The initial flowering stage is an important barrier for the prevention and control of Sclerotinia sclerotiorum. At present, rapeseed has entered the bud stage in most areas, and it is about to enter the early flowering stage. The rapeseed grows prosperously, the ventilation and light transmission in the field is poor, and the sclerotinia sickness is easy to occur after the temperature rises. All localities should strengthen forecasting and forecasting, and guide farmers to prevent and cure Sclerotium disease in time after the weather has cleared. The specific method is to use 40% sclerotia 100-200 g per mu or 50% carbendazim WP 100-200 g to 50 kg of water, which is generally controlled once in the early flowering stage of rapeseed, and the field of flowering is obvious. Control once.

(3) Combining control and promoting scientific fertilization.

Spring is the rapid growth period of rapeseed, and it is also the peak period of fertilizer demand. It is necessary to control the application of nitrogen fertilizer according to the timely and appropriate amount of seedlings, and to properly apply phosphorus and potassium fertilizer. For the poorly growing and late-sown fields in the lower reaches of the Yangtze River, applying 2-3 kg of urea and 5 kg of potassium chloride per acre can increase the number of branches, flower buds, per pod fruit and 1000-grain weight. Apply boron fertilizer to the field with less or no boron application. In response to the postponement of the growth period of rapeseed this year, all localities should carry out "one spray three defenses" during the flowering period. The application rate per acre can be sprayed with 200 g of potassium dihydrogen phosphate, 100-200 g of carbendazim, 50-100 g of selebrex boron (effective boron content of 20%) and 50 kg of water. Promote growth, prevent premature aging, prevent sclerotia, and prevent high temperature.

(4) Harvest at the right time and ripen after stacking.

In oily rice and dryland rapeseed, the cropping season is relatively loose. It should be harvested when the eighty-seven plants of the whole field are yellow, and stacked in the ground or the sun dam for 5-7 days. After the ripening, the weather is threshed in order to improve the oil content. . The one-time mechanical harvest of rapeseed is carried out after the pods are completely yellow. In order to timely replant the rice in the paddy rice field, the harvest can be harvested when the whole field of 60% rapeseed is yellow (2 to 3 days earlier than normal maturity), and the rapeseed is cut from the middle and lower part of the plant and stacked on the field or in the field. (The pod layer is placed upwards), and covered with a film for 3-4 days, spread out to dry, accelerate the ripening of rapeseed, increase the 1000-grain weight and oil content.