Effect of plowing and harrowing on some physical properties of a typical Bangkok clay | |
| Author | Ong, Kheng Hoi |
| Call Number | AIT Thesis no. 1236 |
| Subject(s) | Tillage--Research Soils--Thailand--Bangkok--Testing |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand |
| Publisher | Asian Institute of Technology |
| Abstract | On many soils, the benefits of minimum seedbed preparation have been established; however the extent to which it can be used in fine-textured soils, which normally present tillage problems, was not established. The experiment was carried out on Bangkok clay to study the effect of three types of plowing treatments, namely no-plowing, vertical-disk plowing and moldboard plowing, and three levels of harrowing, i.e. harrowed-once, harrowed-twice and harrowed-trice, on some of the soil physical properties. Significant differences in the soil bulk density, total porosity and soil strength. were observed between the harrowing treatments and the levels of harrowing. These were attributed by the difference in the ability of the plowing and harrowing treatments in working down the soil. The unplowed and vertical-disk plowed treatments generally had plow depths shallower than the core sample's depth of 10 cm. It was observed that no significant difference existed in the mean-weight clod size between the plowing treatments. Nevertheless, highly significant difference was shown between the harrowing treatments. The moldboard plowing - harrowing sequence of operation was found to be most effective in producing a suitable and deep-enough seedbed on the clay soils. |
| Year | 1977 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Nielsen, Jens Moller |
| Examination Committee(s) | Singh, Gajendra ; Paiboon Prabuddham |
| Scholarship Donor(s) | Lee Foundation of Singapore |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1977 |