From 11 to 12, there were small to moderate rains in the north of China, Huanghuai, Jianghuai, Jiangnan, South China and southwestern China. Heavy rain occurred in parts of the south of the Yangtze River and northern China, and heavy rains occurred in parts of the south and south of the south of the Yangtze River (50-90 mm). ). Strong precipitation is not conducive to the flowering and pod formation of rapeseed.
Since the rapeseed planting in autumn of 2011, most of the meteorological conditions in the production area have changed gradually. The water and heat conditions in the autumn to winter are good, which guarantees the planting area of ​​rapeseed and lays a good foundation for seedlings; but from January to March 2012. Most of the medium-term production areas continued to be cold and rainy, resulting in the growth period of rapeseed was 5 to 15 days later than normal. The seedlings decreased, which had a certain impact on the growth and yield of rapeseed. The weather improved in the middle and late March, which was conducive to the growth and development of rapeseed. .
The hydrothermal conditions in autumn to early winter are good, which is conducive to sowing seedlings and forming strong seedlings. In the fall of 2011, the temperature in the middle and lower reaches of the Yangtze River and the southwestern region were higher than normal, the precipitation was sufficient, and the soil moisture was suitable, which was conducive to the seedling emergence, transplanting and survival of rapeseed, and the cultivation of rapeseed. The temperature in the early winter is slightly lower than that in normal years, which inhibits the excessive growth of rapeseed in some areas, enhances the ability to resist cold, and lays a good foundation for seedlings.
In April, rapeseed has entered a critical stage of production formation. At this time, the temperature fluctuates greatly and the strong convective weather increases. All localities should pay close attention to the weather changes, strengthen the field management, and make up for the adverse effects caused by the low temperature and low weather.
First, all localities must strengthen water and fertilizer management. In view of the characteristics of late growth and weak growth of rapeseed this year, it is necessary to supplement the horn fruit fertilizer in time, promote the weight gain of pods and pods, increase the grain weight; clear the ditch in time to prevent premature aging, lodging, and promptly remove Weeds improve the microclimate in the field and promote the formation of yield.
The second is to strengthen the monitoring and control of pests and diseases. In the early period of continuous rainy weather, the soil moisture is large, and the suitable temperature and humidity conditions are conducive to the development of sclerotinia disease. The production area should adopt measures such as foliar fertilization and drug control to avoid spreading.
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