more than 10 years of research and development

Food crops mainly include wheat, rice, maize, oat, rye, barley, millet, sorghum and barley. Among them, wheat, rice and maize account for more than half of the world's food.

1. Wheat, rice and maize are known as the three major grain crops, and their yields are as follows:

[1] In 1990, wheat sown area was 231.5 million hectares, accounting for about one third of the world's total grain sown area, and wheat output was 595.1 million tons, accounting for 31% of the world's total grain output.

[2] Rice is one of the most important food crops in the world. In 1990, the sown area was 145.8 million hectares, accounting for more than 20% of the world's total grain sown area. The annual output was 518.5 million tons, accounting for 27% of the world's total grain output.

[3] Corn people's food is also a forage crop, which is regarded as "miscellaneous grain" or "coarse grain". In 1990, the sown area was 129.1 million hectares, accounting for 18.5% of the world's total grain sown area, second only to wheat and rice, ranking third.

2. Distribution of wheat production in the world

The world wheat is concentrated in temperate regions of 25 N-55 N and 25 S-40 S.

There are four main producing areas in the Northern Hemisphere: Western Europe Plain-Central Europe Plain, Southern Eastern Europe Plain-Southern West Siberia Plain; Northeast China Plain-North China Plain-Middle and Lower Yangtze Plain; Mediterranean Coast-Turkey, Iran-India River and Ganges Plain; Central North America Plain. Four wheat belts account for more than 90% of world wheat production. The main commodity wheat areas are the United States and Canada. In Dalian, Australia, Argentina and France, wheat exports account for more than 80% of the world's total wheat exports.

The main distribution areas in the southern hemisphere are South Africa, southern Australia and the Pampas grassland in South America.

3. Distribution of maize production in the world

Maize originated in Central America and is a kind of warm-loving crop. Maize is widely distributed, mostly concentrated in areas with high temperature, rainy summer and long growing season. Maize mainly concentrated in North America, Asia and Europe, accounting for more than 4/5 of the world's total maize production; among them, North America is the largest, accounting for 46.75% of the world's total Maize production, ranking first in the world, followed by Asia (1/5) and Europe (1/7). Maize mainly concentrates in three major regions: the corn belt in the central United States, which produces more than 2/5 of the world's maize. The North China Plain, the Northeast Plain, the Guanzhong Plain, the Sichuan Basin and so on. The Southern Plain of Europe, from France to the west, through Italy, Yugoslavia, to Romania. In 1991, the country with the largest output was the United States (189 million tons), followed by China (99 million tons).

4. Distribution of Rice Production in the World

The northernmost limit of rice growth is Huma, Heilongjiang Province, China. But the main growing areas are southern China, Taiwan, Japan, Korean Peninsula, Southeast Asia, South Asia, the Mediterranean coast of southern Europe, the southeastern United States, Central America, Oceania and parts of Africa. Rice is also grown in the river areas of northern China. [2] That is to say, besides Antarctica, rice is grown in almost all parts of China. Rice growth.

5. Cleaning up of grain

Now wheat, corn and rice are all cleaned up by grain sorters. After seed cleaner, gravity separator, destoner, vibration grader, color sorter etc. and then to become commodity grain for sale and consumption.