机具作用时间对农田黑土压实效应的影响

Effects of Compaction Effect about Implement Action Time on Black Soil

通过农田土壤压实模拟装置,以基质势作为土壤压实程度指标,对东北黑土区典型农田黑土在0.1～2.5s作用时间下的压实效应进行了研究。结果表明,农田黑土在100、200、400和800kPa接地压强下,0.1～2.5s作用时间下存在过度压实的阈值时间。阈值时间可以通过土壤基质势与作用时间关系确定,阈值时间随土壤有机质含量提高而提高。因此,在保证作业质量的前提下,合理选择机具作用时间、降低接地压强和提高有机质含量是避免农田土壤过度压实的重要措施。

Through farmland soil compaction simulation device,matric potential as indicators of soil compaction, compaction effect of typical black soil region of northeast black soil in 0.1～2.5 s action time were studied.Results showed that black soil in 100,200,400 and 800 kPa ground pressure and during 0.1～2.5 s action time had threshold time of excessive compaction.Threshold time can be determined by the relationship of soil matric potential and action time.With the increase of soil organic matter,threshold time improved.Therefore,in the precondition of ensuring the operation quality,reasonable selection of implement action time,reducing ground pressure and increasing organic matter content were important measures that avoid excessive compaction of soil.