ASSESSING PROCEDURES OF ESTIMATING PRE-COMPACTION STRESS OF SOIL AMENDED WITH ORGANIC MANURES USING DATA FROM PLATE SINKAGE AND CONFINED COMPRESSION TESTS

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AGHILINATEGH N.; HEMMAT A.; SADEGHI M.

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Journal: Journal of Water and Soil Science Year:2011 | Volume:15 | Issue:55 Page(s): 183-197

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Title

ASSESSING PROCEDURES OF ESTIMATING PRE-COMPACTION STRESS OF SOIL AMENDED WITH ORGANIC MANURES USING DATA FROM PLATE SINKAGE AND CONFINED COMPRESSION TESTS

Author(s)

AGHILINATEGH N. | HEMMAT A. | SADEGHI M. | Issue Writer Certificate

Keywords

SOIL COMPACTIONQ2

CONFINED COMPRESSION TESTQ2

PLATE SINKAGE TESTQ3

PRE-COMPACTION STRESSQ3

ORGANIC MANURESQ2

Abstract

One important parameter in determining the allowable stress to prevent SOIL COMPACTION is precompaction stress (σpc). If the stress induced into the soil due to agricultural machinery traffic is lower than the spc, the possibility of the irreversible (plastic) deformation is low. In this study, PLATE SINKAGE TEST (PST) and CONFINED COMPRESSION TEST (CCT) were used to determine the spc of the disturbed soil samples obtained from the topsoil of a long-term organic amendment experiment. In the organic amendment experiment, ORGANIC MANURES (sewage sludgeو compost, farmyard manure) at three rates (25, 50 and 100 t ha-1) and one inorganic fertilizer combination (250 kg urea ha-1 and 250 kg ammonium phosphate ha-1) were added to a silty clay loam soil for seven years under wheat-corn rotation. The effect of organic and inorganic fertilizers and gravimetrical water contents (17.1 and 20.9% db) on the spc values was determined using two statistical designs: 1) factorial design and 2) orthogonal contrasts in a completely randomized design with three replications. The spc values were estimated by the following methods: 1) Casagrande, 2) maximum curvature and 3) intercept of virgin compression line (VCL) with the x-axis at zero strain. The results showed that in both tests, the spc values for treatments amended with ORGANIC MANURES had over-estimations and the values of the over-estimation were increased as the manure application rate increased. The values of the over-estimations for CCT were higher than for PST. Therefore, it can be concluded that the results of the PST are more reliable. The spc values estimated by any of the three procedures depend on the manure treatment as well as the initial water content of the soil. For determining the stress at the threshold of the compaction for the un-manure soils (control and inorganic fertilizer) or the treatments amended with low application rate (25 t ha-1) of the ORGANIC MANURES, the PST and the Casagrande procedure can be recommended. In contrast, for the soils amended with high application rates (50 and 100 t ha-1), the PST and the maximum curvature procedure can be used.

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APA: Copy

AGHILINATEGH, N., HEMMAT, A., & SADEGHI, M.. (2011). ASSESSING PROCEDURES OF ESTIMATING PRE-COMPACTION STRESS OF SOIL AMENDED WITH ORGANIC MANURES USING DATA FROM PLATE SINKAGE AND CONFINED COMPRESSION TESTS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 15(55), 183-197. SID. https://sid.ir/paper/14764/en

Vancouver: Copy

AGHILINATEGH N., HEMMAT A., SADEGHI M.. ASSESSING PROCEDURES OF ESTIMATING PRE-COMPACTION STRESS OF SOIL AMENDED WITH ORGANIC MANURES USING DATA FROM PLATE SINKAGE AND CONFINED COMPRESSION TESTS. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2011;15(55):183-197. Available from: https://sid.ir/paper/14764/en

IEEE: Copy

N. AGHILINATEGH, A. HEMMAT, and M. SADEGHI, “ASSESSING PROCEDURES OF ESTIMATING PRE-COMPACTION STRESS OF SOIL AMENDED WITH ORGANIC MANURES USING DATA FROM PLATE SINKAGE AND CONFINED COMPRESSION TESTS,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 15, no. 55, pp. 183–197, 2011, [Online]. Available: https://sid.ir/paper/14764/en

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