通过2002～2003年夏玉米田问试验研究了不同耕作措施对土壤结构和养分的影响.结果表明:耕作后B2容重减少较多;2003年9月份各个坡度秸秆下B2的0～10 cm、11～20cm两土层的平均容重比对照分别降低13.39%和13.41%;2003年9月份各个坡度秸秆下B2的0～10 cm土层的平均土壤固相率比对照降低13.38%,平均土壤液相和气相的比例提高了19.72%和10.64%;耕作后B2的土壤养分增加也较多。

This paper investigated the effects of various tillage measures on soil structure and nutrient of sum-nler maize through field experiments in 2002-2003 Results showed that：Through the measurement．the soil bulkdensity of B2 decreased much than that of cheek after tillage；The average soil bulk density of B_{2<\sub> under mulch de-creased respectively 13.39％and 13.41％than that of cheek on 0-10cm，11-20cm tWO soil layers in september．2003；The average soil solid rate nf 7<\sub>under mulch decreased 13.38％than that of cheek on 0-10cm soil layer．and the average soil liquid rate．the average soil gas rate increased respectively 19.72％and 10.64％in september．2003：And the soil nutrient gained much than that of cheek.}