The effect of soil compaction on the growth and grain yield of soybean on clay soil | |
| Author | Jayatilake, Kamani Geeethanjalee |
| Call Number | AIT Thesis no.AE-04-03 |
| Subject(s) | Soil compaction Soybean--Soils. |
| Note | A dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-04-03. |
| Abstract | Most physical properties of agricultural soils could be affected by compaction due to vehicular traffic by agricultural machinery causing deficiencies in crop growth and yield. Among many legume crops soybean (Glycine max (L) Mere) possess the leaching roles because of its exceptional nutritional constituents, and its ability to be grown as short-term secondary crop in many parts of the world. The objective of this study was to determine the effect of soil compaction on soil physical properties and growth and grain yield of soybean crop in Bangkok clay soil. By a series of field experiments, the compaction effect by axle load and wheel passes on soil physical properties and soybean growth and yield were investigated. Compaction in terms of four axle load treatments (power tiller dead weight, and approximately 1.3, 1.6 and 1.9 times the dead weight) and four wheel pass treatments (0, 1, 3, and 5 passes) were imposed by a power tiller tires after the seed bed preparation. The effect of compaction on soil physical properties (bulk density, soil porosity and cone penetration resistance) were measured before and after treatments, soybean growth parameters (plant height, plant dry weight, root dry weight, pod parameters) at each growth stages during the growing period and finally the yield were assessed . There were significant changes, an increasing trend in soil bulk density and penetration resistance values observed in 1, 3, and 5 passes and axle load increased by 2 kN and 3 kN compare to the control treatments. Decreasing trends were observed in porosity in both compaction methods and a steeper trend in axle load treatment Growth parameters were mostly affected by 3 wheel passes, 5 wheel passes, 2 kN and 3 kN axle loads. Decreasing trends were observed for most growth parameters such as plant dry weight, root length, stem diameter, seeds per pod and pods per plant. A decreasing trend of grain yield (1364 -978 kg/ha) was appeared in wheel pass treatment while axle load treatment did not show such a trend. On average yield values of axle load treatment remained in a lower range compare to no wheel pass treatment (817, 978, 708 and 801 kg/ha). The used compaction levels did not lead to severe subsoil compaction in clay soils however, it affected the growth performance of soybean plant at different growth stages. It did not contribute to statistically significant changes within the treatments in most measured parameters. Compaction effects of Axle load appeared to be more predominant than the wheel pass treatment. |
| Year | 2004 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-04-03. |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jayasuriya, H.P. W.; |
| Examination Committee(s) | Salokhe, V.M.;Canillas, Emmanuel C.;Babel, M.S.; |
| Scholarship Donor(s) | Government of Netherlands.; |