Effects of corn straw cover years on soil organic matter and compactness in typical black soil areas of Songnen Plain

Abstract China is a huge agricultural country with rich straw resources. However, the problem to be solved urgently find means use crop effectively and reasonably. To study influence of no-tillage mulching measures on soil compactness organic matter, taking black test field in Gaojia Village, Lishu County, Jilin Province as research object, characteristics matter different tillage layers under cover years no-till are discussed. The results show following: (1) 0–50 cm layer, highest treatment method NT 1 (no-tillage corn stover for one year), an average value 2.62%, content increased by 57.46% compared RT (ridge tillage). (2) surface (0–20 cm) higher than RT, increase more 6.87%, deep (20–50 lower decrease 23.48%. (3) No-tillage can improve agglomeration structure soil, moisture reduce volume thus increasing firmness soil. This provide theoretical basis promoting comprehensive utilization resources developing eco-agriculture.