Since the autumn, most of the temperature in the Sichuan Basin has changed dramatically. So far, in the past two months of the past, the temperature of the basin has experienced two large steep drops, and the intensity of the process cooling has reached the standard of cold wave or strong cold wave. The first strong temperature drop from September 20 to 24, the daily average temperature dropped from the peak of 28.9 °C on September 19 to 17.8 °C, the process cooling rate was about 11 °C; the second strong temperature drop from October 22 At the beginning, it has been 5 days, the daily average temperature has dropped from 20.4 °C to 10.1 °C, and the process has cooled to about 10 °C; if so, it occurs frequently in the mid-autumn season, and the rain is "from Xia Chengqiu" and "one night into winter" The temperature changes drastically, and such "autumn wind" weather is rare in the autumn climate of the perennial basin.
At the same time, the rainy days in the basin since the fall have also been rare in recent years.
In terms of the Sichuan and the Sichuan agricultural areas in the southwestern Sichuan Basin, the temporal and spatial distribution of autumn rain and autumn wetness is: rainy in early September, and the rainy days in the plateau mountainous areas and parts of southwestern Sichuan are 7-9 days; The majority of the Qiu District and the Anning River Plain are also about 6 days. The majority of the wetness is mainly distributed in the northeast, southeast and Panxi regions of the basin; the rainfall is more than double that of the same period of the previous year.
During the rainy period in late September, most of the basins and parts of the southwestern Sichuan have rainy days of 7-9 days or more; the majority of the wetness is concentrated in the northwestern part of the basin and the basin south of the hills and even the entire southwestern Sichuan, with more precipitation than normal. More than 50%.
During the rainy period from the end of October to the middle of the middle of October, except for a few rainy days in a few hilly areas in the western part of the basin, almost all of the Sichuan agricultural areas have been raining for more than half of the time, although the rainfall is not large; When the three rainy periods are superimposed, the rainy days in the entire Sichuan agricultural area are 15-20 days, or even 20-25 days; the wetness of the underlying surface is obvious.
For the current rainy weather, the agricultural advice is as follows:
1. In the past agricultural year, the basin was winter, spring, summer, volt, and autumn, and the seasonal drought was very light, or basically did not appear. The perennial autumn rain-prone areas such as the southwestern basin and the northeastern basin occur mostly in the autumn season, and since the autumn of this year, the basin has been rainy, which masks the regional differences in the autumn rain climate. Therefore, the wet damage and grass damage caused by autumn rain in most agricultural areas in Sichuan has caused certain difficulties for autumn farming activities, and it also brought heavy tasks to the winter field management work of Xiaochun grain and oil crops in the new agricultural year. Grasping the current autumn species and strengthening the management of the early spring seedling stage may be the focus of key agricultural activities for a period of time after the autumn broadcast.
2. Autumn rain adds a lot of convenience to the farmland water conservancy and autumn storage work, especially for some Tanggu micro-water conservancy to increase water storage, as shown in Figure 17. The water conservancy of large and medium-sized projects needs to be investigated in depth; strengthening the management of autumn storage in the water source project is always an important basic material condition for the agricultural safety measures in the next spring of next year, and it is a good opportunity to seize the favorable conditions of autumn rain. The increase in the total amount of water will provide necessary and sufficient water source preparation for water use, disaster prevention and reduction in the next spring.
3. The autumn temperature level of Sichuan agricultural area is not low this autumn. Except for the strong cooling caused by two strong cold waves, the temperature conditions for the rest of the time are conducive to the planting of autumn and winter vegetables and the positive growth of seedling stage. Nowadays, vegetables everywhere are growing well, especially the leafy autumn vegetables have a relatively fast vegetative growth, and the pests are relatively small and light, as shown in Figure 18. This is to stabilize the market price of vegetables, and there is ample food and quality. Ye Cai Ying City. Some facilities for vegetable winter seedlings have begun. Strengthening the field management of autumn and winter vegetables is still a very urgent and important task for the safety of the "vegetable basket project".
4. The recent temperature fluctuations are relatively large. In view of the temperature conditions suitable for wheat, the average temperature of the day drops to about 15 °C. The suitable time for wheat to be broadcasted is relatively short and relatively concentrated. Please be sure to pay close attention to the time of farming, and plough the wheat before the end of November, and strive to not broadcast the late-season wheat after November 15. The temperature trend and the autumn rain are all brought to the attention of the wheat farmers, and the difficulty is not small, please pay attention to it.
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