Investigating Effects of types of Tillage and Cover Plant on the Gompertz Model Coefficients and Confined Compression Curve

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Bayat Hossein; Bayazidi Farhad; Ebrahimi Eisa; Hamzei Javad

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Journal Paper

Paper Information

Journal: APPLIED SOIL RESEARCH Year:2024 | Volume:12 | Issue:2 Page(s): 79-95

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Information Journal Paper

Title

Investigating Effects of types of Tillage and Cover Plant on the Gompertz Model Coefficients and Confined Compression Curve

Author(s)

Bayat Hossein | Bayazidi Farhad | Ebrahimi Eisa | Hamzei Javad | Issue Writer Certificate

Keywords

Compression

stress

Chisel

Vicia

Lathyrus sativus

Abstract

Tillage reduces soil compaction while increasing soil porosity. Cover plants are fast-growing plants with great impacts on the physical and chemical properties of soil. The confined Compression curve indicates the relationship between stress and void ratio. This research evaluated the impact of tillage types and cover plants on Gompertz model coefficients. In this research, a factorial experiment in a randomized complete block design was conducted with three replications in Hamadan province. Experimental factors were tillage at three levels, including conventional tillage, conservation tillage, or minimum tillage and no-tillage systems, with cover plant factor at three levels of Vicia, Lathyrus sativus, and no cover plant. Samples were taken at the end of the growing season. To measure the confined Compression curve, intact samples were used at 6, 30, and 1500 kPa. The effect of treatments on the coefficients of the confined Compression curve revealed that coefficients, b, and c were reduced in Lathyrus sativus and Vicia, respectively compared to the crop plant due to the higher organic matter content. Also, there was a reduction in the soil compressibility of these plants (Lathyrus sativus and Vicia). The pre-compaction stress in different treatments ranged between 2.46 and 2.58 kPa, with the highest value in Vicia under minimum tillage treatment. In general, the results demonstrated that the use of cover plants and conservation tillage leads to not only a decrease in soil compaction but also an improvement in the physical and mechanical properties of the soil, decreasing soil compressibility.

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