Saying fairly, because our nation at a unit area of plough land can be produced more grain it has played great role to solve food problem of 1.3 billions population especially including super rice of academician Yuan Longping, hybrid corn Yudan-13 of researcher Li Denghai, soybean high yield zhonghuang №6 of researcher Wang Lianzheng, wheat high yield variety xiaoyan №6 of academician Li Zhensheng, they have a great contributions. In the world mainly produced grain superpower Chinese grain output per a unit area of plough land is the highest and higher than over 51% of US, however if our ideas have been limited by high yield to solve Chinese food problem and think of have being high yield seed including GM rice Chinese food problem can be solved that are too misplayed. Here simple formula as following ：
?Grain output＝output per unit area×area of plough land
This formula makes us to enlarge our ideas. Videlicet total grain output is product of two factors, per unit yield of grain in our country have been higher than others, the opinion by theory of soil using artificial plough land to increase our land resource and reach the target increasing grain. If our plough land reaches up 4 billions mu account of 500㎏／mu our grain output capacity will maybe reach 2 billions tons. I ask Chinese scientists, especially agricultural scientists that do you dare it is true, if you have it to be done, so I say that is not good only depending on high yield.(to be proofread)
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