一位东北农民很骄傲地介绍自己的经验：“单卖苞米不赚钱，但用自产的苞米养猪，成本就低了。”“多投入,多产出”是东北农民过去长期的农业生产观念,现在这种观念正在被“合理投入,有效产出”所取代。近两年吉林省农安县采集了上万个土样进行化验,结果显示,由于近年来大量投入 A Northeast farmer is very proud to introduce his own experience: “Single sell corn is not profitable, but the cost of raising pigs with self-produced corn is low.” “More investment, more output” is the past long-term agricultural production of farmers in Northeast China Concept, which is being replaced by “reasonable input and effective output”. Nearly two years, Nong’an County, Jilin Province collected tens of thousands of soil samples for testing, the results show that due to a large investment in recent years