A Study on the Seed Susceptibility of Wheat (Triticum aestivum L.) Cultivars to Impact Damage

Author
F. Shahbazi
Department of Agricultural Machinery, Faculty of Agriculture, Lorestan University, Lorestan, Islamic Republic of Iran.
Abstract
Mechanical damage due to harvesting, handling, and other processes is an important factor that affects the seeds quality. Seed damage results in lower grain value and more storability problem and reduces seed germination and seedling vigor and subsequent yield of crops. Tests were conducted to determine the percentage of physical damage (PPD) and percentage of loss in germination (PLG) of wheat seeds due to impact. The effect of wheat seed variety and impact velocity was determined. Wheat seed varieties selected for testing included: Kohdasht, Maron, Simereh, Sardari and Zagros. Four impact velocities: 10, 20, 30 and 40 m s-1 were used. Results showed that effects of impact velocity and seed variety on seed damages were significant. PPD to seeds was higher than PLG in higher impact velocities. It found that the total damage of seeds increased from 4.17% (0.48 PPD and 3.68 PLG) to 73.32 % (47.59 PPD and 25.73 PLG) as impact velocity increased from 10 to 40 m s-1 for all wheat varieties studied. Impact results indicated that Sardari wheat variety was more susceptible to PPD (27.39 %), while Maron seeds were more susceptible to PLG (14.70%). Among the varieties studied, Sardari wheat seeds showed the highest level of total damage i.e.sum of PPD and PLG.

Keywords

1. ASAE. 1993. ASAE S352.2 Dec 92. Moisture Measurement: Unground Grain and Seeds. In ASAE Standards, 1993, St. Joseph, ASAE, MI, 449 PP.
2. Ayre, L. 1980. Seed Vigor Affects Cereal throughout the Season. Arable Farm, 3:42-45.
3. Bartsch, J. A., Haugh, C. G., Athow, K. L. and Peart, R. M. 1979. Impact Damage to Soybean Seed. ASAE Paper No. 79-3037, St. Joseph, ASAE, MI.
4. Baryeh, E. A. 2002. A Simple Grain Impact Damage Assessment Device for Developing Countries. J. Food. Eng., 56: 37-42.
5. Bergen, G. A., Jayas, D. S. and White, N. D. G. 1993. Physical Damage to Peas and Lentils Due to Free Fall. Can. Agric. Eng., 35(2): 151-155.
6. Bilanski, W. K. 1966. Damage Resistance of Seed Grains. Trans. ASAE, 19(2): 360-363.
7. Bourgeous, L., Moes, J. and Stobbe, E. H. 1995. Impact of Threshing on Hard Spring Wheat Seed Vigor. Can. J. Plant Sci., 76: 215-221.
8. Evans, M. D., Homes, R. G. and McDonald, M. B. 1990. Impact Damage to Soybean Seed as Affected by Surface Hardness and Seed Orientation. Trans. ASAE, 33(1): 234-240.
9. Fiscus, D. E., Foster, G. H. and Kaufmann, H. H. 1971. Physical Damage of Grain Gaused by Various Handling Techniques. Trans. ASAE, 14(3): 480-485.
10. Grass, L. and Tourkmani, M. 1999. Mechanical Damage Assessment in Rejected Durum Wheat Seed Lots in Morocco. Seed. Sci. Technol., 27: 991-997.
11. Khazaei. J., Shahbazi. F., Massah. J., Nikravesh, M. and Kianmehr, M. H. 2008. Evaluation and Modeling of Physical and Physiological Damages to Wheat Seeds under Successive Impact Loadings: Mathematical and Neural Networks Modeling. Crop Sci., 48: 1532-1544.
12. King, D. L. and Riddolls, A. W. 1960. Damage to Wheat Seed and Pea Seed in Threshing. J. Agric. Eng. Res., 5: 387-398.
13. Kirk, I. W. and McLeod, H. E. 1967. Cottonseed Rupture from Static Energy and Impact Velocity. Trans. ASAE, 10(2): 217-219.
14. Mitchell, F. S. and Roundthwaite , T. E. 1964. Resistance of Two Varieties of Wheat to Mechanical Damage by Impact. J. Agric. Eng. Res., 9: 303-306.
15. Parde, S. R., Kausalb, R. T., Jayasa, D. S. and White, N. D. G. 2002. Mechanical Damage to Soybean Seed during Processing. J. Stored. Prod. Res., 38: 385-394.
16. Paulsen, M. R., Nave, W. R. and Gray, L. E. 1981. Soybean Seed Quality as Affected by Impact Damage. Trans. ASAE, 24(6): 1577-1582.
17. Ptasznik, W., Bernard, J., Giec, W. and Khan, A. A. 1995. Susceptibility of Bean Seeds to Thermal and Impact Damage. J. Agric. Eng. Res., 61:137-144.
18. SAS. 1985. SAS User's Guide: Statistics. Version 5 Edition, Statistical Analysis System, Inc., Cary, NC., USA.
19. Shahbazi, F. 2010. A Study on Susceptibility of Chickpea (Cicer arietinum L.) Seed Varieties to Mechanical Damage. Ir. J. Biosys. Eng., 41(2): 105-112.
20. Sosnowski, S. 2006. Reasons of Mechanical Damage of Bean Seeds under Dynamic Loads. Acta. Agrophysica, 130:1-65.
21. Stout, B. A. and Cheze, B. 1999. Plant Production Engineering. CIGR Handbook Agric. Eng., Am. Soc. of Agric. Eng. , St. Joseph, MI, 3.
22. Szwed, G. and Lukaszuk, J. 2007. Effect of Rapeseed and Wheat Kernel Moisture on Impact Damage. Int. Agrophysics, 21: 299-304.
23. Tang, J., Sokhansanj, S. and Sosulski, F. 1991. Determination of the Breakage Susceptibility of Lentil Seed. Cereal. Chem., 68(6): 647-650.
Journal of Agricultural Science and Technology
Volume 14, Issue 3
May and June 2012
Pages 505-512