The United States accounts for more than 40%, China accounts for nearly 20%, and South America accounts for about 10%. Corn production in China is relatively independent, with low annual import and relatively stable export. Domestic annual output has become the main factor affecting domestic supply. Generally speaking, domestic corn began to be listed at the end of 10. When it went public, it was the time when the spot price of corn went down. In May and June of the following year, corn began to be in short supply, and the price began to rise, reaching its peak in July and August.

Under normal circumstances, the price of corn began to fall when the supply reached the highest during the harvest period, and reached a high point when the supply was in short supply in spring and early summer and the output of new works was uncertain. In the middle and late summer solstice, the output of new works will gradually become clear, but it is also the most critical period affected by the weather. Therefore, we should pay close attention to the fact that corn prices will fall before the harvest period. The response degree of corn price to weather change ultimately depends on the overall supply and demand of the market.