What are the main reasons for the continuous reduction of grain production in China?

1. The seeds of cereals are closely related to the local climate. 2. The sowing season missed the prime time. 3. Fertilization and management are not in place in cultivation. 4. The climate temperature difference is too big to be ignored. In recent years, the influence of temperature on grain output is obvious. In 20 18, the wheat yield in Shandong province was generally low, which was mainly caused by weather except for scab in the later period. The continuous rainfall during sowing delayed the sowing of wheat by one week.

This year, some areas in Texas suffered from severe drought during summer sowing. The drought-affected area in counties such as Leling Qingyun exceeds 300,000 mu, and many farmers do not sow corn until July (the local sowing date is not later than June 25th), resulting in many corns not maturing normally due to insufficient accumulated temperature. First, the external climate. If the temperature is low this year and the accumulated temperature of wheat can't reach its required temperature, wheat production will be reduced. In the second case, drought, if the temperature is too high all the year round and the rainfall is low, it will also reduce production if it cannot be watered on time.

First, the area of high-yield crops has decreased. As we know, corn is a high-yield crop, and the average yield per mu is more than three times that of soybean. This year, the national corn planting area is 55 1 10,000 mu, a decrease of more than 20 million mu or 3.6% compared with the previous year. The soybean planting area increased by 65438+ 1 100 million mu over the previous year. Second, agricultural meteorological disasters in China are more serious than last year. The production of summer grain and early rice has been reduced due to natural disasters. In the early stage of autumn grain growth, many places in the south suffered from heavy precipitation, Hubei, Anhui and other places were seriously affected, some farmland was repeatedly flooded, and crops fell seriously.

There are mainly two parts, man-made reasons and natural environment reasons. Man-made reasons include seed selection, cultivation methods, drug management leading to phytotoxicity, untimely weeding and fertilization leading to the shortage of fertilizer-removing grass and so on. Natural causes include natural disasters, or inappropriate temperatures, and so on. ! There are many scientific reasons for the reduction of grain production, except water shortage. If you don't know much about the climate and other reasons, you won't talk nonsense. Or factors such as pests and diseases will also lead to reduced grain production.