The sowing date and harvest date of rice and wheat in various places and the seasonal pressure distribution in Xia Dong on various continents.

1。 South of Huaihe River in Qinling Mountains of China is south, and north is north. It takes longer to sow in the south, and it takes longer to sow in the farther south. In some places, it can even be planted three times a year, which means it can be planted at any time. North China is generally planted twice a year and harvested in summer and autumn; It is planted once a year in Northeast China. The geographical latitude of most parts of the United States is similar to that of China, and the planting and harvesting time is the same as that of China. Australia grows crops in the southern hemisphere at the opposite time to China. There is little difference in sowing and harvesting time between Europe and China. You can grasp that the time of sowing and harvesting is the same as that of countries with similar latitude and longitude in China. It's in this geography textbook. You can have a look.

2. There is a general law about air pressure: the land air pressure is higher than the ocean air pressure in winter and the ocean air pressure is higher than the land air pressure in summer.

3. High dimension, low temperature and short plant growth period; Low latitude, high temperature and long plant growth period.