Field experiments of soil testing and formula fertilization and farmers used fertilizer were conducted to study effects of soil testing and formula fertilization on maize yield and fertilizer benefit.The results showed that in the treatment by formula fertilization could improve maize yield better than that by the farmer custom fertilization in different types of soil,the retain production of maize was increased by 2.62%~33.71%,the income was increased by1 261.69~5 293.74 yuan/hm2 and the ratio of output to...