اثر مدیریت شخم و کشت گیاهان پوششی بر شاخص‌های منحنی فشردگی خاک در شرایط رطوبتی مختلف

نویسندگان

1 دانشگاه بوعلی سینا

2 دانشجوی دکتری دانشگاه گیلان، ایران،

3 کارشناسی ارشد فیزیک و حفاظت خاک، دانشکده کشاورزی، دانشگاه بوعلی سینا همدان،

چکیده

فشردگی خاک یکی از مهمترین عوامل محدود کننده رشد ریشه گیاهان است. برای بررسی وضعیت فشردگی از منحنی فشردگی که بیانگر رابطه بین نسبت پوکی و تنش فشاری است، استفاده می‌شود. هدف از انجام این پژوهش بررسی اثر تغییر سیستم خاک‌ورزی و نوع گیاه پوششی بر ویژگیهای فشردگی خاک است. برای بررسی اثر نوع خاک‌ورزی و نوع گیاه پوششی بر شاخص‌های منحنی فشردگی محصور، فاکتور گیاه پوششی در سه سطح ماشک، خلر و بدون گیاه پوششی و فاکتور خاک‌ورزی نیز در سه سطح خاک‌ورزی مرسوم، کمینه‌خاک‌ورزی و بی‌خاک‌ورزی به‌ صورت آزمون فاکتوریل در قالب طرح بلوک‌های کامل تصادفی با سه تکرار در دو سال زراعی متوالی انجام شد. آزمایش‌های سه مکش ماتریک خاک 6، 30 و 1500 کیلوپاسکال انجام شد. منحنی فشردگی در تیمارهای مختلف با استفاده از دستگاه تک‌محوری اندازه-گیری شد و سپس شاخص‌های منحنی فشردگی محصور شامل تنش پیش‌-تراکمی، شاخص فشردگی و شاخص تورم تعیین شدند. نتایج نشان داد که بیشینه مقدار شاخص فشردگی در مکش‌های ماتریک 30 و 1500 کیلوپاسکال در تیمار خاک‌ورزی حداقل بدون گیاه پوششی برابر با 63/0 و 75/0 به دست آمده است. نتایج نشان داد که میزان تاثیر نوع خاک‌ورزی و نوع گیاهان پوششی تابعی از مقدار مکش خاک است و در مکش‌های ماتریک کم تغییرات معنی‌داری در فشردگی خاک رخ می-دهد. همچنین مشاهده شد که خاک‌ورزی حفاظتی نسبت به خاک‌ورزی مرسوم سبب بهبود وضعیت فشردگی خاک شده است. به‌طورکلی نتایج نشان داد که استفاده از گیاهان پوششی و سیستم خاک‌ورزی حفاظتی در مناطق نیمه خشک نقش مهمی در کاهش فشردگی خاک دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Tillage Management and Cover Crop Cultivation on the Components of the Soil Compression Curve in Different Matric Suctions

نویسندگان [English]

  • hossein bayat 1
  • eisa ebrahimi 2
  • farhad bayazidi 3
1 Assistant Professor (PhD), Department of Soil Science, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran.
2 Ph. D. Student, Soil Science Department, Faculty of Agricultural Sciences, University of Guilan, Rasht
3 Former M.Sc. Student of Soil Science, Department of Soil Science, Faculty of Agriculture, Bu Ali Sina University, Hamedan, Iran
چکیده [English]

Abstract
Background and Objectives
Soil compaction is a crucial factor that limits plant growth and reduces yield. To assess the level of compaction, the compaction curve is used, which shows the relationship between compressive stress and void ratio. This curve comprises three main components: pre-compression stress, compression index, and swelling index. The soil behaves elastically along the swelling line but becomes plastic and irreversible at the end of the virgin compaction line. The point where these two lines intersect is known as pre-compaction stress. The soil swelling index indicates its resilience and elasticity, while the compaction index reflects its ability to resist or undergo compaction. Some researchers have used the ratio of swelling index to compaction index to express soil's ability to recover after being subjected to stress. As long as applied stress does not exceed pre-compaction stress, soil exhibits elastic properties. To date, no comprehensive study has been conducted on how tillage type and cover crop type affect confined compression curve parameters. Therefore, this research aims to investigate how changing tillage systems and cover crop types impact soil compaction characteristics at different suctions.
Methodology
This study was conducted at Bu-Ali Sina University, Hamedan, Iran, to investigate the effect of tillage type and cover crop type on the components of the confined compression curve. The cover crop factor was tested in three levels: Vicia ash, Lathyrus sativus, and no cover crop. The tillage factor was tested in three levels: conventional tillage, minimum tillage, and no tillage. The experiment was designed as a randomized complete block factorial with three replications over two consecutive crop years. The Experiments were conducted at three suctions of 6, 30, and 1500 kPa. The confined compression curve was measured using a uniaxial device under a loading rate of 1 mm/min. The test consisted of two stages: loading and unloading. During the loading stage, 100 readings were taken at 0.01 mm intervals with an additional force of 10 kPa applied to the sample at each interval. During the unloading stage, 33 readings were taken at 0.03 mm intervals. Finally, the components of the confined compaction curve including pre-compaction stress, compaction index, and swelling index were determined.
Findings
The results indicated that the highest compaction index values for suction levels of 30 and 1500 kPa were observed in the tillage treatment without cover crops, with values of 0.63 and 0.75, respectively. The effectiveness of tillage and cover crop types was found to be dependent on soil suction levels, with significant changes in soil compaction occurring at lower suctions. Conservation tillage was observed to improve soil compaction compared to conventional tillage. At the suction level of 6 kPa, the cover crop had a significant effect (p < 0.05) on the swelling index, while the effect of tillage on this parameter was not significant. The reduction in compaction index due to cover crop application may be attributed to increased binding properties of soil particles, reduced deformation against external forces, and increased soil resilience. At the suction level of 6 kPa, higher moisture content resulted in differences in mechanical characteristics of the soil due to different cultivation systems and plant types. Overall, the results indicated that an increase in soil suction leads to an increase in pre-compression stress. However, no significant changes were observed in the three parameters investigated at suctions of 1500 kPa and 30 kPa. It is possible that the interaction between tillage type, cover crop type, and moisture content at this suction level contributed to the increase in pre-compaction stress observed in the conservation tillage-cover crop treatment. This may be due to improvements in soil structure, which have a significant impact on soil compaction properties. At the matric suction of 1500 kPa, the highest compaction index value was observed in the tillage treatment without cover crops (0.754). At lower suctions, cover crops were found to reduce compressibility by increasing soil elasticity, while treatments without cover crops were more susceptible to compaction.
Conclusion
In conclusion, the study investigated the impact of tillage practices, cover crop types, and soil suction levels on soil compaction properties. The findings revealed that the compaction index values were highest in the tillage treatment without cover crops at suction levels of 30 and 1500 kPa, indicating greater susceptibility to compaction in the absence of cover crops. The effectiveness of tillage and cover crops varied depending on soil suction levels, with notable changes in compaction occurring at lower suctions. It was observed that treatments that increase organic matter in the soil, decrease soil compressibility. Overall, the results have shown that using cover crops and conservation tillage systems in semi-arid areas plays an important role in reducing soil compaction.

کلیدواژه‌ها [English]

  • No-tillage
  • Pre-compaction stress
  • Minimum tillage
  • Swelling index
  • Cover crops

مراجع

Aragón A,  Garcıa MG, Filgueira RR and Pachepsky YA, 2000. Maximum compactibility of Argentine soils from the Proctor test; the relationship with organic carbon and water content. Soil and Tillage Research 56(3-4): 197-204.
Atkinson J 1993. An Introduction to the Mechanics of Soils and Foundations: Through Critical State Soil Mechanics. McGraw-Hill Book Company (UK) Ltd.‏
Bayat H, Ebrahimi E and Fallah M, 2018. Estimation of soil moisture using confined compression curve parameters. Geoderma 318: 64-77.
Blanco-Canqui H and Lal R, 2007. Regional assessment of soil compaction and structural properties under no-tillage farming. Soil Science Society of America Journal 71: 1770–1778
Bronick CJ and Lal R, 2005. Soil structure and management: a review. Geoderma 124(1-2): 3-22.‏
Casagrande A, 1936. The determination of pre-consolidation load and it's practical significance. Vol.3, P.60, In: Proceedings of International Conference of Soil Mechanics and Foundation Engineering. Cambridge.
Chakraborty K and Mistri B, 2017. Estimation of soil compaction from bulk density and its effect on crop production: A case study of Burdwan-I Block, West Bengal. Indian Journal of Spatial Science 8(2): 101-107.
Chen F, Sun X and Lu H, 2022. Influence of water content on the mechanical characteristics of mudstone with high smectite content. Geofluids. https://doi.org/10.1155/2022/9855213
Cresswell HP and Hamilton GJ, 2002. Bulk density and pore space relations.Pp.35-58, ‏ In: McKenzie NJ, Cresswell H and Coughlan K. (eds.), Soil Physica Measurement and Interpretation for Land Evaluation: A Laboratory Melbourne Handbook, CSIRO Publishing, Australia.
Da Veiga M, Horn R, Reinert DJ and Reichert JM, 2007. Soil compressibility and penetrability of an Oxisol from southern Brazil, as affected by long-term tillage systems. Soil and Tillage Research 92(1-2): 104-113.
Derpsch R, Friedrich T, Kassam A and Li H, 2010. Current status of adoption of no-till farming in the world and some of its main benefits. International Journal of Agricultural and Biological Engineering 3(1): 1-25.
Dexter AR, 1988. Advances in characterization of soil structure. Soil and Tillage Research 11(3-4): 199-238.
Ebrahimi E, Bayat H and Fallah M, 2021. Relationship of soil moisture characteristic curve and mechanical properties in Entisols and Inceptisols of Iran. Geoderma Regional 27: e00434.
Hamza MA and Anderson WK, 2005. Soil compaction in cropping systems: A review of the nature, causes and possible solutions. Soil and Tillage Research 82(2): 121-145.
Horn R, Richards BG, Gräsle W, Baumgartl T and Wiermann C, 1998. Theoretical principles for modelling soil strength and wheeling effects a review. Zeitschrift für Pflanzenernährung und Bodenkunde 161(4): 333-346.
Huo L, Liu J, Abbas A, Ding Q, Wang H, Zhou Z and Bai Z, 2022. Effects of dry bulk density and water content on compressive characteristics of wet clayey paddy soil. Agronomy Journal 114(4): 2598-2607.
Imhoff S, Da Silva AP and Fallow D, 2004. Susceptibility to compaction, load support capacity, and soil compressibility of Hapludox. Soil Science Society of America Journal 68(1): 17-24.
Jimenez RL, Gonçalves WG, de Araújo Filho JV, de Assis RL, Pires FR and Silva GP, 2008. Crescimento de plantas de cobertura sob diferentes níveis de compactação em um Latossolo Vermelho Growth of cover crops under different levels of soil compaction of a Typic Red Latosol. Revista Brasileira de Engenharia Agrícola e Ambiental-Agriambi 12(2): 116-121.
Junior MD and Pierce FJ, 1995. A simple procedure for estimating preconsolidation pressure from soil compression curves. Soil technology 8(2): 139-151.
Gompertz B, 1825. On the nature of the function expressive of the law of human mortality, and on a new mode of determining the value of life contingencies. Pp.513–583, Philosophical Transactions of the Royal Society of London.
Keller T, Lamandé M, Schjønning P and Dexter AR, 2011. Analysis of soil compression curves from uniaxial confined compression tests. Geoderma 163(1-2): 13-23.
Kemper WD and Rosenau RC, 1986. Aggregate stability and size distribution. Pp.425–442, In: Klute A, (ed.), Methods of Soil Analysis, Part 1: Physical and Mineralogical Methods. Soil Science Society of America, Madison, Wisconsin, USA.
Kemper WD and Chepil WS, 1965. Size distribution of aggregates. Pp.499–510, In: Klute A, (ed.), Methods of Soil Analysis, Part 1: Physical and Mineralogical Methods. Soil Science Society of America, Madison, Wisconsin, USA. 
Koolen AJ and Kuipers H, 1989. Soil deformation under compressive forces. Pp. 37-52, In: Mechanics and Related Processes in Structured Agricultural Soils, Springer, Dordrecht.
Koolen AJ, 1974. A method for soil compactibility determination. Journal of Agricultural Engineering Research 19(3): 271-278.
Koudahe K, Allen SC and Djaman K, 2022. Critical review of the impact of cover crops on soil properties. International Soil and Water Conservation Research 10)3(: 343-354
Kuan HL, Hallett PD, Griffiths BS, Gregory AS, Watts CW and Whitmore AP, 2007. The biological and physical stability and resilience of a selection of Scottish soils to stresses. European Journal of Soil Science 58(3): 811-821.
Larson WE, Gupta SC and Useche RA, 1980. Compression of agricultural soils from eight soil orders 1. Soil Science Society of America Journal 44(3): 450-457.
Lebert M and Horn R, 1991. A method to predict the mechanical strength of agricultural soils. Soil and Tillage Research 19(2-3): 275-286.
Liebman M and Davis AS, 2000. Integration of soil, crop and weed management in low-external-input farming systems. Weed Research Oxford 40(1): 27-48.
Lin L, Han S and Wang E, 2016. Effect of organic matter and clay content on compression rebound characteristics of black soil. Acta Pedologica Sinica 53: 1138–1147
Mahboubi AA, Lal R and Faussey NR, 1993. Twenty-eight years of tillage effects on two soils in Ohio. Soil Science Society of America Journal 57(2): 506-512.
Mosaddeghi MR, Hajabbasi MA, Hemmat A and Afyuni M, 2000a. Compactibility of Lavark soil as affected by soil moisture content and farmyard manure. Journal of Science and Technology of Agriculture and Natural Resources 3(4): 27-40. (In Persian with English abstract).
Mosaddeghi MR, Hajabbasi MA, Hemmat A and Afyuni M, 2000b. Soil compactibility as affected by soil moisture content and farmyard manure in central Iran. Soil and Tillage Research 55(1-2): 87-97.
Klute A and Dirksen C, 1986. Hydraulic conductivity and diffusivity. Pp. 687-734, In: Klute A, (ed.), Methods of Soil Analysis, Part 1: Physical and Mineralogical Methods. Soil Science Society of America, Madison, Wisconsin, USA.  
Okovido JO and Obroku EO, 2021. Study of density and void ratio relation for reconstituted tropical residual soil at varying fines contents. Nigerian Journal of Technology 40(3): 371-378.
Pereira JO, Défossez P and Richard G, 2007. Soil susceptibility to compaction by wheeling as a function of some properties of a silty soil as affected by the tillage system. European Journal of Soil Science 58(1): 34-44.
Pesch C, Lamandé M, de Jonge LW, Norgaard T, Greve MH and Moldrup P, 2020. Compression and rebound characteristics of agricultural sandy pasture soils from South Greenland. Geoderma 380: 114608.
Pytka J, 2001. Load effect upon soil stress and deformation state in structured and disturbed sandy loam for two tillage treatments. Soil and Tillage Research 59(1-2): 13-25.
Reichert JM, Mentges MI, Rodrigues MF, Cavalli JP, Awe GO and Mentges LR, 2018. Compressibility and elasticity of subtropical no-till soils varying in granulometry organic matter, bulk density and moisture. Catena 165: 345–357.
Saffih-Hdadi K, Défossez P, Richard G, Cui YJ, Tang AM and Chaplain V, 2009. A method for predicting soil susceptibility to the compaction of surface layers as a function of water content and bulk density. Soil and Tillage Research 105(1): 96-103.
Schwarz D, Pagáč M, Petruš J and Polzer S, 2022. Effect of water-induced and physical aging on mechanical properties of 3D printed elastomeric polyurethane. Polymers 14(24): 5496.
Seitz D, Fischer LM, Dechow R, Wiesmeier M and Don A, 2022. The potential of cover crops to increase soil organic carbon storage in german croplands. Plant and Soil 1-17.
Sharratt B, Zhang M and Sparrow S, 2006. Twenty years of tillage research in subarctic Alaska: I. Impact on soil strength, aggregation, roughness, and residue cover. Soil and Tillage Research 91(1-2): 75-81.
Soane BD, 1990. The role of organic matter in soil compactibility: a review of some practical aspects. Soil and Tillage Research 16(1-2): 179-201.
Stengel P, 1990. Characterization of the structural state of the soil. Objectives and methods. Soil structure and its evolution, Laon (France) 9: 15-36.
Stipešević B and Kladivko EJ, 2005. Effects of winter wheat cover crop desiccation times on soil moisture, temperature and early maize growth. Plant Soil Environment 51(6): 255-61.
Suravi KN, Attenborough K, Taherzadeh S, Macdonald AJ, Powlson DS, Ashton RW and Whalley WR, 2021. The effect of organic carbon content on soil compression characteristics. Soil and Tillage Research 209: 104975.
Tang AM, Cui YJ, Eslami J and Défossez P, 2009. Analysing the form of the confined uniaxial compression curve of various soils. Geoderma 148(3-4): 282-290.
Vogeler I, Horn R, Wetzel H and Krümmelbein J, 2006. Tillage effects on soil strength and solute transport. Soil and Tillage Research 88(1-2): 193-204.
Wei P, Zheng YY, Xiong Y, Zhou S, Al-Zaoari K and Zaoui A, 2022. Effect of water content and structural anisotropy on tensile mechanical properties of montmorillonite using molecular dynamics. Applied Clay Science 228: 106622.
Xiao Z, Yu N, An J, Zou H and Zhang Y, 2022. Soil compressibility and resilience based on uniaxial compression loading test in response to soil water suction and soil organic matter content in Northeast China. Sustainability 14(5): 2620.
Zhang B, Horn R and Hallett PD, 2005. Mechanical resilience of degraded soil amended with organic matter. Soil Science Society of America Journal 69(3): 864-871.
 
 
 
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