China's grain output has been stable at more than 1.3 trillion jin for eight consecutive years. The so-called "ton of grain field" refers to farmland with an annual grain output of 2000,<> jin.
To create tons of grain fields in the northeast region, it is necessary to protect and make good use of the black soil, the "giant panda in the cultivated land" The local tonne grain field is not calculated as dry grain with standard water, but as tide grain with 4 waters. Even so, field agriculture can produce 30,2000 kilograms of corn tide grain per mu in a good year.