Effect of tillage practices on selected physical properties of soil and rice yield in Bangkok clay soil | |
| Author | Rahmati, Mohammad Hashem |
| Call Number | AIT Diss. no.AE-01-03 |
| Subject(s) | Tillage Soil physics |
| Note | A dissertation submitted in partial fulfillment of the requirements for the Degree of Doctor of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. AE-01-03 |
| Abstract | Many tillage methods are practiced by the farmers, which vary from conventional to unconventional methods. Therefore, this study was conducted to determine the effects of conventional and selected other tillage treatments on the specific soil physical properties and rice yield during two rainy seasons (1998 and 1999) and one dry season (2000) in Bangkok clay soil, The tillage treatments tested in the first rainy season were; a) plowing once by moldboard plow, rotary tilling once, three times harrowing, leveling followed by transplanting (H3R1T); b) plowing once by moldboard plow, three times harrowing, , leveling followed by transplanting (H3ROT); plowing once by moldboard plow,rotary tilling twice, harrowing three times, leveling and transplanting (H3R2T); and d) plowing once by moldboard plow, harrowing twice, leveling and direct seeding (H2R1T) and the conventional tillage (H3ROT). The experimental design during rainy seasons was Randomized Complete Block (RCB) with four replicates. In the dry season, Treatments were randomized and four replicates were used. In the first rainy season there were significant linear relationships (P=0.05) between the value of bulk density in the plow layer and rice yield. Besides, it was found that increase in the intensity of tillage practices decreased the values of hydraulic conductivity, cone index, infiltration rate and bulk density in the plow layer, In the dry season, conventional tillage (H3ROT) was superior in terms of production higher rice yield and lower costs of tillage practices when compared to treatment (H3R1T). AS revealed in the rainy season, decreasing cone index (from 150 to 90 kPa) and bulk density (from 1.20 to 1.16 g/cm3) in the pole layer significantly increased the rice yield in Bangkok clay soil. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. AE-01-03 |
| Type | Dissertation |
| 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) | Salokhe, V.M.; |
| Examination Committee(s) | Salokhe, V.M.;Ranamakhaarachchi, S.L.;Ahmed, K.M.; |
| Scholarship Donor(s) | Agricultural Ministry of Iran; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2001 |