Hunan rapeseed grows slowly, and early spring field management is particularly important.

In January 2011, Hunan experienced the coldest month since 1978. The average temperature in the province was only 1.9 °C, ranking second in history. The average monthly temperature in 32 cities and counties such as Zhangjiajie and Fenghuang hit a new low. The average temperature in Changsha is 2.0 °C, which is 3 °C lower than the historical period. Due to the long duration of the low temperature in the previous period, Hunan rapeseed grew slowly.

On February 23, in the rape field of Hunan Academy of Agricultural Sciences, the reporter saw that the variety of rapeseed was uneven, and a small number of early-maturing varieties had entered the flowering period, but the mid-maturing varieties were still in the bolting period, and the growth was poor. The rapeseed is only 20 to 30 cm high. “The growth period of the whole rapeseed is delayed by about 7 to 10 days compared with previous years. At this time last year, the rapeseed of the medium-ripe variety has entered the initial flowering period”. Professor Chen Weijiang from the Crop Research Institute of Hunan Academy of Agricultural Sciences analyzed that the main reason for the poor growth and slow growth of rapeseed this year was that the weather in our province was cold in January, the temperature continued to be low, the average temperature was low, and the accumulated temperature was low.

Although the rain and snow are frequent, the extreme low temperature is not too low, and the rape damage is not serious. In January, there were frequent rains and snows in Hunan. There were 4 rain and snow weather events. The number of rain and snow days was between 6 and 26 days. The strongest snowfall period occurred from 18th to 20th, including 69 cities and counties including Changsha. Blizzard. Because the freezing is not very serious in general, the extreme minimum temperature is not too low, generally between -3 ° C and -4 ° C, the freezing damage of the leaves and moss of rapeseed is not very serious. Professor Chen Weijiang from the Crop Research Institute of Hunan Academy of Agricultural Sciences explained that the reason why rapeseed injury is not serious this year is that the temperature in our province is slowly decreasing in January, the growth of rapeseed has experienced the stage of low-temperature refining, and the other reason is the extreme minimum temperature. Not very low. However, when heavy snow fell in Changsha from the 18th to the 20th, some of the rapeseed that had been bolted was still quite serious.

At present, Hunan Province is in the midst of winter and spring alternating. In early spring, the temperature rises faster, the rainwater increases obviously, and the weather changes. Field management is especially important. Professor Chen Weijiang suggested that farmers should start to strengthen field management from three aspects. First, pay special attention to clearing ditch drainage in spring. Because rapeseed is a crop that needs water and water, there is much rain in spring. At this time, it is necessary to strengthen drainage in the field. The second is that for the poorly growing rapeseed, you can properly chase some moss fertilizer, but the amount is not too big; the third is to pay close attention to the change of temperature, if the rainy weather is more, the temperature will rise faster, pay attention to the bacteria Prevention and treatment of nuclear diseases.

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