Change characteristic of soil compaction of long-term different tillage methods in cropland

Soil tillage is closely related to creating favorable conditions for crop growth and ensuring crop yield. One of the main goals of soil tillage is influencing the physical, chemical and biological properties of soil. One of the basic soil properties affected by tillage is the soil compaction. The objective of this work was to evaluate the effects of no tillage (NT), plow tillage (PT), spacing tillage (ST) and conventional tillage (CT) on the soil compaction from annual and seasonal changes, soil profile characteristics and seasonal freezing-thawing for a productive soil. The field experiment was initiated in Gongzhuling County, Jilin Province in 1983, which was to determine the effects of various rotation and tillage combinations on crop yield and soil physical and chemical properties. The soil of the experimental site was silt loam, which was well-drained soil developed mainly from glacial tillage. The experiment design was a completely random block design with 3 replications. The plot was 150 m long and 8 m wide (1 200 m2). We measured the soil compaction change in different years and seasons with SC-900 soil compaction meter. The results showed that no tillage increased the soil compaction in 0-25 cm depth significantly(Pth was higher than other dates. The soil compaction of different tillage methods increased with the increase of soil depth, which meant the soil compaction of upper layer was less than lower layer significantly(P ©, 2015, Chinese Society of Agricultural Engineering. All right reserved.