耕层和土壤质量是玉米大幅度、可持续增产的首要限制因子

摘要

Aiming at the maize production and development situation in Northeast of China,the limiting factors for sharply and sustainable yield-increasing of maize were analysed in the study.The analysis indicated that,with the improvement of productivity level,too shallow topsoil depth became more problematic.Shallow tillage was a cultivation at low productivity level period.The topsoil depth condition must be improved in order to make sure sharply and sustainable yield-increasing of maize.The source of blocking maize straw returning to filed was too shallow topsoil depth.There was still misunderstanding concerning soil tillage at present.%针对我国东北地区玉米生产状况和发展趋势,对玉米大幅度增产和可持续增产的限制性因子进行探讨.分析指出:随着生产力水平的提高,耕层过浅问题越加突显；浅耕是生产水平低下时期的耕作方式,要实现玉米大幅度增产和可持续增产必须在耕层改造上下工夫；耕层太浅是阻碍玉米秸秆还田的根源所在；目前在土壤耕作上还存在一些误区.