Volume 7, Issue 1 ((Spring and Summer) 2020)                   Iranian J. Seed Res. 2020, 7(1): 39-52 | Back to browse issues page

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Malek M, Ghaderi-Far F, Torabi B, Sadeghipour H. (2020). Quantification of Changes in Relative Humidity and Seed Moisture Contents of Canola Cultivars under Different Temperatures Using Hygroscopic Equilibrium Curve. Iranian J. Seed Res.. 7(1), 39-52. doi:10.29252/yujs.7.1.39
URL: http://yujs.yu.ac.ir/jisr/article-1-438-en.html
Gorgan University of Agricultural Sciences and Natural Resources , farshidghaderifar@yahoo.com
Abstract:   (5931 Views)

Extended Abstract
Introduction: Seeds, like other materials, are hygroscopic and exchange moisture with their surroundings. The changes in the moisture of seeds during storage depend on their hygroscopic nature and this feature plays an important role in determining the seed quality and longevity. Furthermore, studying the hygroscopic characteristics if seeds can be useful in seed storage studies as well as in commercial applications such as drying and seeds processing. Therefore, in this study, the relationship between seed moisture content and relative humidity in seed of rapeseed cultivars was studied.
Material and Methods: In this study, the relationship between the ambient relative humidity and seed moisture content of three rapeseed cultivars at 10, 20 and 30 °C was investigated using hygroscopic equilibrium curves. Therefore, water desorption and absorption curves were studied separately. Water absorption and desorption curves were obtained by drying the seeds at 1% relative humidity and seed hydration at 100% relative humidity, respectively, followed by transferring the seeds to different relative humidities at different temperatures and finally determining the equilibrium moisture content of the seeds. It should be noted that glycerol and sulfuric acid solutions were used to creation different relative humidity. Finally, the relationship between seeds moisture content against the relative humidity was quantified by fitting the D’Arcy-Watt equation.
Results: The results indicated that the seeds moisture content varied in cultivars and temperatures at different relative humidities. Also, there was a difference between water desorption and absorption curves in all cultivars and temperatures; desorption curves were generally higher than water absorption curves. The greatest difference among the cultivars regarding seed moisture content was observed at 100% relative humidity, and this difference was less severe at lower relative humidities. Also, the highest seed moisture content of rapeseed cultivars was observed at 20 °C and 100% relative humidity, and the lowest seed moisture content was recorded at 30 °C and 1% relative humidity.
Conclusions: According to the results, it was found that the relationship between seed moisture content and relative humidity followed a sigmoidal function, and this relationship would also vary depending on cultivar and temperature. There was also a difference between the adsorption and desorption curves, which is called "hysteresis", and showed that the seed moisture content at a constant relative humidity was generally higher in the state of dehydration compared with that in the state of hydration. Due to this event, desorption curve is situated higher than the absorption curve.

  1. Response to hygroscopic equilibrium curves in seeds of different rapeseed cultivars was compared.
  2. Sulfuric acid and glycerol solutions were used to create different relative humidity.
Article number: 3
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Type of Study: Research | Subject: General
Received: 2019/09/15 | Accepted: 2019/12/14

1. Agrawal, R.L. 1980. Seed Technology. Publisher: Oxford & IBH Publishing Co. New Delhi, 685 p.
2. Akram-Ghaderi, F., Soltani, A. and Kamkar, B. 2010. Seed Science and Technology. Jahad University Press of Mashhad, 512p. [In Persian].
3. Al-Muhtaseb, A., Mcminn, W. and Magee, T. 2004. Water sorption isotherms of starch powders: part 1: mathematical description of experimental data. Journal of Food Engineering, 61(3): 297-307. [DOI:10.1016/S0260-8774(03)00133-X]
4. Ayranci, E., Ayranci, G., and Dogantan, Z. 1990. Moisture sorption isotherms of dried apricot, fig and raisin at 20 C and 36 C. Journal of Food Science, 55: 1591-1593. [DOI:10.1111/j.1365-2621.1990.tb03577.x]
5. Bewley, J.D., Bradford, K. and Hilhorst, H. 2013. Seeds: Physiology of Development, Germination and Dormancy. Springer Science & Business Media, 27-81.
6. Bradford, K. J., Dahal, P. and Bello, P. 2016. Using relative humidity indicator paper to measure seed and commodity moisture contents. Agricultural Environmental Letters, 1(1): 1-4. [DOI:10.2134/ael2016.04.0018]
7. Daniel, I., Kruse, M. and Börner, A. 2013. Controlled deterioration and predicting viability of Okra seed in storage. International Journal of Vegetable Science, 19(4): 324-333. [DOI:10.1080/19315260.2012.729261]
8. Director, J., Parihar, S., Dadlani, M. and Basu, S. 2014. Effect of seed moisture content and storage temperature on seed longevity of hemp (Cannabis sativa). Indian Journal of Agriculture Science, 84: 1303-1309.
9. Ellis, J.E., Bass, L.N. and Witing, D. 2008. Storing vegetable and flowers seeds. Seed Science and Technology, 28: 413-420.
10. Ellis, R. 1988. The viability equation, seed viability nomographs, and practical advice on seed storage. Seed Science and Technology, 16: 29-50.
11. Ellis, R., Agrawal, P., and Roos, E. 1988. Harvesting and Storage Factors That Affect Seed Quality in Pea, Lentil, Faba bean and Chickpea. In World Crops: Cool season food legumes. Springer, Dordrecht. pp. 303-329. [DOI:10.1007/978-94-009-2764-3_29]
12. Ellis, R., and Hong, T. 2007. Quantitative response of the longevity of seed of twelve crops to temperature and moisture in hermetic storage. Seed Science and Technology, 35: 432-444. [DOI:10.15258/sst.2007.35.2.18]
13. FAO (Food and Agriculture Organization of the United Nations). 2018. FAOSTAT Statistics Database.
14. Gaderi-Far, F., Soltani, A. and Sadeghipour, H.R. 2010. Determination of seed viability constants in medicinal pumpkin (Cucurbita pepo L. subsp. Pepo. Convar. Pepo var. styriaca Greb), borago (Borago officinalis L.) and black cumin (Nigella sativa L.). Journal of Plant Production, 17: 53-66. [In Persian with English Summery].
15. Hall, C.W. 1975. Drying Farm Crops. Reynoldsburg, Ohio: Agricultural Consulting Associates, Inc.
16. Hay, F.R., Mead, A., Manger, K. and Wilson, F.J. 2003. One step analysis of seed storage data and the longevity of Arabidopsis thaliana seeds. Journal of Experimental Botany, 54: 993-1011. [DOI:10.1093/jxb/erg103] [PMID]
17. Kapsalis, J. G. 1981. Moisture sorption hysteresis. In: Rockland, L.B. and Stewart, G.F. (Eds.). Water Activity: Influences on Food Quality. New York: Academic Press, pp. 143-177. [DOI:10.1016/B978-0-12-591350-8.50011-5]
18. Kaya, S. and Kahyaoglu, T. 2006. Influence of dehulling and roasting process on the thermodynamics of moisture adsorption in sesame seed. Journal of Food Engineering, 76(2): 139-147. [DOI:10.1016/j.jfoodeng.2005.04.042]
19. Khaliliaqdam, N. and Ghaderi-Far, F. 2012. Simulation of moisture changes and temperature effect on response of hygroscopic equilibrium curve of two soybean cultivars seed. Journal of Seed Science and Technology, 1: 53-61. [In Persian with English Summery].
20. Kouhila, M., Belghit, A., Daguenet, M. and Boutaleb, B. 2001. Experimental determination of the sorption isotherms of mint (Mentha viridis), sage (Salvia officinalis) and verbena (Lippia citriodora). Journal of Food Engineering, 47(4): 281-287. [DOI:10.1016/S0260-8774(00)00130-8]
21. Malik, C.P. and Jyoti. 2013. Seed deterioration: A review. International Journal of Life Science Biotechnology and Pharma Research, 2(3): 374-385.
22. Roberts, E. and Ellis, R. 1989. Water and seed survival. Annals of Botany, 63: 39-39. [DOI:10.1093/oxfordjournals.aob.a087727]
23. Shelar, V., Shaikh, R., and Nikam, A. 2008. Soybean seed quality during storage: a review. Agricultural Review, 29(2): 125-131.
24. Sogi, D., Shivhare, U., Garg, S. and Bawa, A. 2003. Water sorption isotherm and drying characteristics of tomato seeds. Biosystems Engineering, 84(3): 297-301. [DOI:10.1016/S1537-5110(02)00275-1]
25. Sun, W.Q. 2002. Methods for Studying Water Relations under Stress. In Desiccation and Survival in Plants: Drying without Dying. (eds.). Black, M. and Pritchard, H.W. pp. 47-91, CABI Publishing, New York, NY. [DOI:10.1079/9780851995342.0047]
26. Velázquez-Gutiérrez, S.K., Figueira, A.C., Rodríguez-Huezo, M.E., Román-Guerrero, A., Carrillo-Navas, H. and Pérez-Alonso, C. 2015. Sorption isotherms, thermodynamic properties and glass transition temperature of mucilage extracted from chia seeds (Salvia hispanica L.). Carbohydrate Polymers, 121: 411-419. [DOI:10.1016/j.carbpol.2014.11.068] [PMID]
27. Yan, Z., Sousa-Gallagher, M.J. and Oliveira, F.A. 2008. Sorption isotherms and moisture sorption hysteresis of intermediate moisture content banana. Journal of Food Engineering, 86(3): 342-348. [DOI:10.1016/j.jfoodeng.2007.10.009]

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