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Soil solarization

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Soil solarization

Soil solarization is a non-chemical environmentally friendly method for controlling pests using solar power to increase the soil temperature to levels at which many soil-borne plant pathogens will be killed or greatly weakened.[1] Soil solarization is used in warm climates on a relatively small scale in gardens and organic farms.[2] Soil solarization weakens and kills fungi, bacteria, nematodes, and insect and mite pests along with weeds in the soil[3] by mulching and covering the soil with a tarp, usually with a transparent polyethylene cover to trap solar energy.[4] This energy causes physical, chemical, and biological changes in the soil community.[5] Soil solarization is dependent upon time, temperature, and soil moisture.[1] It may also be described as a method of decontaminating soil or creating disease suppressive soils by the use of sunlight.[6][7]

Soil disinfestation

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Soil solarization is a hydrothermal process of disinfecting the soil of pests, accomplished by solar power (referred to as solar heating of the soil in early publications) and is relatively a new soil disinfestation method, first described in extensive scientific detail by Katan in 1976.[8] The mode of action for soil solarization is complex and involves the use of heat as a lethal agent for soil pests from the use of transparent polyethylene tarps.[9] To increase the effectiveness of solar heating requires optimal seasonal temperatures, mulching during high temperatures and solar irradiation, and moist soil conditions.[10] Soil temperatures are lower when decreasing in soil depth and it is necessary to continue the mulching process to control for pathogens.

Soil solarization practices require that soil temperatures reach 35-60 degrees Celsius (95 to 140°F), which kills pathogens in the top 30 centimeters of soil.[11] Solarization does not sterilize the soil completely. Soil solarization enhances the soil towards promoting beneficial microorganisms.[1] Soil solarization creates a beneficial microbial community by killing up to 90% of pathogens.[11] More specifically, a study reported after eight days of solarization 100% of Verticillium dahliae (a fungus that causes farm crops to wilt and die) was killed at a depth of 25 centimeters.[9] Soil solarization causes a decrease in beneficial microbes, however beneficial bacteria like Bacillus species are able to survive and flourish under high temperatures in solarized soils.[11] Other studies have also reported an increase in Trichoderma harzianum, a fungus that is also used as a biological fungicide,[12] after solarization.[11] Soil solarization allows for the recolonization of competitive beneficial microbes by creating a favorable environment.[3] The number of beneficial microbes increases over time and makes solarized soils more resistant to pathogens.[11]

The success of solarization is not only due to the decrease in soil pathogens, but also to the increase in beneficial microbes such as Bacillus, Pseudomonas, and Talaromyces flavus.[1] Soil solarization has been shown to suppress soil borne pathogens and cause an increase in plant growth, in particular after organic supplementation.[13][14] Suppressed soils promote rhizobacteria and have shown to increase total dry weight in sugar beets by 3.5 times.[15] Also the study showed that plant-growth promoting rhizobacteria on sugar beets treated with soil solarization increased root density by 4.7 times.[15] Soil solarization is an important agricultural practice for ecologically friendly soil pathogen suppression, the efficacy of which even overwhelms that of fumigation.[16]

Soil decontamination

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A 2008 study used a solar cell to generate an electric field for electrokinetic remediation of cadmium-contaminated soil. The solar cell could drive the electromigration of cadmium in contaminated soil, and the removal efficiency that was achieved by the solar cell was comparable with that achieved by conventional power supply.[17]

In Korea, various remediation methods of soil slurry and groundwater contaminated with benzene at a polluted gas station site were evaluated, including a solar-driven, photocatalyzed reactor system along with various advanced oxidation processes (AOP). The most synergistic remediation method incorporated a solar light process with TiO2 slurry and H2O2 system, achieving 98% benzene degradation, a substantial increase in the removal of benzene.[18]

History

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Soil solarization is the third approach for soil disinfestation. The two other main approaches, soil steaming and fumigation, were developed at the end of the 19th century.[19][20] In 1939, Groashevoy, who used the term "solar energy for sand disinfection", controlled Thielaviopsis basicola upon heating the sand by exposure to direct sunlight in Caucasus.[21] The idea of solarization was based on observations by extension workers and farmers in the hot Jordan Valley, who noticed the intensive heating of the polyethylene-mulched soil. The involvement of biological control mechanisms in pathogen control and the possible implications were indicated in the first publication, noticing the very long effect of the treatment.[8] In 1977, American scientists from the University of California at Davis reported the control of Verticillium in a cotton field, based on studies started in 1976, thus denoting, for the first time, the possible wide applicability of this method.[22]

The use of polyethylene for soil solarization differs in principle from its traditional agricultural use. With solarization, soil is mulched during the hottest months (rather than the coldest, as in conventional plasticulture which is aimed at protecting the crop) in order to increase the maximal temperatures in an attempt to achieve lethal heat levels.

In the first 10 years following the influential 1976 publication, soil solarization was investigated in at least 24 countries[23] and has been now been applied in more than 50, mostly in the hot regions, although there were some important exceptions. Studies have demonstrated effectiveness of solarization with various crops, including vegetables, field crops, ornamentals and fruit trees, against many pathogens, weeds and a soil arthropod. Those pathogens and weeds which are not controlled by solarization were also detected. The biological, chemical and physical changes that take in solarized soil during and after the solarization have been investigated, as well as the interaction of solarization with other methods of control. Long-term effects including biological control and increased growth response were verified in various climatic regions and soils, demonstrating the general applicability of solarization. Computerized simulation models have been developed to guide researchers and growers whether the ambient conditions of their locality are suitable for solarization.

Studies of the improvement of solarization by integrating it with other methods or by solarizing in closed glasshouses, or studies concerning commercial application by developing mulching machines were also carried out.

The use of solarization in existing orchards (e.g. controlling Verticillium in pistachio plantations) is an important deviation from the standard preplanting method and was reported as early as 1979.

References

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  1. ^ a b c d Raaijmakers, Jos M.; Paulitz, Timothy C.; Steinberg, Christian; Alabouvette, Claude; Moënne-Loccoz, Yvan (23 February 2008). "The rhizosphere: a playground and battlefield for soilborne pathogens and beneficial microorganisms". Plant and Soil. 321 (1–2): 341–61. doi:10.1007/s11104-008-9568-6. ISSN 0032-079X.
  2. ^ D’Addabbo, Trifone; Miccolis, Vito; Basile, Martino; Candido, Vincenzo (1 December 2009). "Soil solarization and sustainable agriculture". In Lichtfouse, Eric (ed.). Sociology, organic farming, climate change and soil science. pp. 217–74. doi:10.1007/978-90-481-3333-8_9. ISBN 978-90-481-3333-8. Retrieved 2 January 2026.
  3. ^ a b Stapleton, James J.; DeVay, James E. (June 1986). "Soil solarization: a non-chemical approach for management of plant pathogens and pests". Crop Protection. 5 (3): 190–8. doi:10.1016/0261-2194(86)90101-8. ISSN 1873-6904. Retrieved 5 January 2026.
  4. ^ Yaduraju, Nanjapur T.; Mishra, J. S. (29 February 2004). "Soil solarization: an eco-friendly approach for weed management". In Inderjit (ed.). Weed biology and management (PDF). pp. 345–62. ISBN 978-1402017612. Retrieved 5 January 2026.
  5. ^ Stapleton, James J. (12 September 2000). "Soil solarization in various agricultural production systems". Crop Protection. 19 (8–10): 837–41. Bibcode:2000CrPro..19..837S. doi:10.1016/s0261-2194(00)00111-3. ISSN 1873-6904. Retrieved 5 January 2026.
  6. ^ Dupont, R. Rayan; McLean, Joan E.; Hoff, Richard H.; Moore, William M. (6 March 2012). "Evaluation of the use of solar irradiation for the decontamination of soils containing wood treating wastes". Journal of the Air & Waste Management Association. 40 (9): 1257–65. doi:10.1080/10473289.1990.10466780. ISSN 2162-2906. Retrieved 5 January 2026.
  7. ^ Fang, Haiyan; Guo, Cunwu; Mei, Xinyue; Hao, Minwen; Zhang, Jiayin; Luo, Lifen; Liu, Haijiao; Liu, Lixiang; Huang, Huichuan; He, Xiahong; Zhu, Youyong; Yang, Min; Zhu, Shusheng (October 2024). "Light stress elicits soilborne disease suppression mediated by root-secreted flavonoids in Panax notoginseng". Horticulture Research. 11 (10) uhae213. doi:10.1093/hr/uhae213. ISSN 2052-7276.
  8. ^ a b Katan, Jaacov; Greenberger, A.; Alon, H.; Grinstein, Avshalom (1 May 1976). "Solar heating by polyethylene mulching for the control of diseases caused by soil-borne pathogens". Phytopathology. 66 (5): 683–8. doi:10.1094/Phyto-66-683. ISSN 0031-949X. Retrieved 5 January 2026.
  9. ^ a b Mihajlović, Milica; Rekanović, Emil; Hrustić, Jovana; Grahovac, Mila; Tanović, Brankica (2017). "Methods for management of soilborne plant pathogens". Pesticidi i Fitomedicina. 32 (1): 9–24. doi:10.2298/pif1701009m. ISSN 1820-3949.
  10. ^ Katan, Jaacov (September 1981). "Solar heating (solarization) of soil for control of soilborne pests". Annual Review of Phytopathology. 19 (1): 211–36. doi:10.1146/annurev.py.19.090181.001235. ISSN 0066-4286. Retrieved 5 January 2026.
  11. ^ a b c d e Katan, Jaacov; Gamliel, Abraham (2 August 2017). "Soil solarization as integrated pest management". In Gamliel, Abraham; Katan, Jaacov (eds.). Soil solarization: theory and practice. American Phytopathological Society. pp. 89–90. doi:10.1094/9780890544198.012. ISBN 9780890544198.
  12. ^ Mollah, Md. Mahi Imam; Hassan, Nayem (September 2023). "Efficacy of Trichoderma harzianum, as a biological fungicide against fungal diseases of potato, late blight and early blight". Journal of Natural Pesticide Research. 5 100047. doi:10.1016/j.napere.2023.100047. ISSN 2773-0786. Retrieved 6 January 2026.
  13. ^ Gamliel, Abraham; Stapleton, James J. (March 1997). "Improvement of soil solarization with volatile compounds generated from organic amendments". Phytoparasitica. 25: S31 – S38. doi:10.1007/BF02980329. ISSN 1876-7184. Retrieved 6 January 2026.
  14. ^ Mauromicale, Giovanni; Lo Monaco, Antonino; Longo, Angela Maria Grazia (December 2010). "Improved efficiency of soil solarization for growth and yield of greenhouse tomatoes". Agronomy for Sustainable Development. 30 (4): 753–61. doi:10.1051/agro/2010015. ISSN 1773-0155. Retrieved 6 January 2026.
  15. ^ a b Stapleton, James J.; Quick, James; DeVay, James E. (1985). "Soil solarization: effects on soil properties, crop fertilization and plant growth". Soil Biology and Biochemistry. 17 (3): 369–73. Bibcode:1985SBiBi..17..369S. doi:10.1016/0038-0717(85)90075-6. ISSN 0038-0717. Retrieved 6 January 2026.
  16. ^ Lombardo, Sara; Longo, Angela Maria Grazia; Lo Monaco, Antonino; Mauromicale, Giovanni (1 May 1976). "Solar heating by polyethylene mulching for the control of diseases caused by soil-borne pathogens". Phytopathology. 66 (5): 683–8. doi:10.1094/Phyto-66-683. ISSN 0031-949X. Retrieved 6 January 2026.
  17. ^ Yuan, Songhu; Zheng, Zhonghua; Chen, Jing; Lu, Xiaohua (15 March 2009). "Use of solar cell in electrokinetic remediation of cadmium-contaminated soil". Journal of Hazardous Materials. 162 (2–3): 1583–7. doi:10.1016/j.jhazmat.2008.06.038. PMID 18656308. Retrieved 6 January 2026.
  18. ^ Cho, Il-Hyoung; Chang, Soon-Woong (January 2008). "The potential and realistic hazards after a solar-driven chemical treatment of benzene using a health risk assessment at a gas station site in Korea". Journal of Environmental Science and Health, Part A, Toxic/Hazardous Substances and Environmental Engineering. 43 (1): 86–97. doi:10.1080/10934520701750090. PMID 18161562. S2CID 19062151. Retrieved 6 January 2026.
  19. ^ Johnson, James (January 1946). "Soil-steaming for disease control". Soil Science. 61 (1): 83–92. Retrieved 6 January 2006.
  20. ^ Hyslop, J. A. (August 1914). "Soil fumigation" (PDF). Journal of Economic Entomology. 7 (4): 305–12. Retrieved 6 January 2006.
  21. ^ Grooshevoy, S. E. (1939). "Disinfestation of seed-bed soil in cold frames by solar energy". Review of Applied Mycology. 18: 635–6. Retrieved 6 January 2026.
  22. ^ Pullman, Gerald S.; DeVay, James E.; Garber, R. H.; Weinhold, A. R. (1981). "Soil solarization: effects on Verticillium wilt of cotton and soilborne populations of Verticillium dahliae, Pythium spp., Rhizoctonia solani, and Thielaviopsis basicola". Phytopathology. 71 (9): 954–9. doi:10.1094/Phyto-71-954.
  23. ^ Katan, J. (1987). "The first decade (1976–1986) of soil solarization (solar heating): A chronological bibliography". Phytoparasitica. 15 (3): 229–255. Bibcode:1987Phyto..15..229K. doi:10.1007/BF02979585. S2CID 31396706.

Further reading

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  • Katan, Jaacov; DeVay, James E. (1991). Soil Solarization. CRC Press. ISBN 9780849368684.
  • James J. Stapleton: Solarization for Vegetable Weed Control. Statewide Integrated Pest Management Program. Kearney Agricultural Center, University of California. pdf
  • Robert McSorley and Harsimran K. Gill: Introduction to Soil Solarization. University of Florida. pdf
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