| Author | Rattana Sonkam |
| Call Number | AIT Thesis no. AE-01-02 |
| Subject(s) | Soybean--Yields--Thailand--Phitsanulok
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of
Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-01-02 |
| Abstract | Since tillage is the operation which makes a major contribution to the cost of crop
production, there has been attempts to reduce the degree of the operation so that the total cost
can be minimized. This study was conducted to evaluate the results of conventional tillage
(CT) and three different conservation tillage methods, namely, no-tillage (NT), inverted-T
seeder (IT), and double disk opener type seeder (DD) on soybean yield under three different
straw management methods, i.e., burnt rice straw (SI), unburnt rice straw and spread by hand
(S2), and cut-straw removed (S3) in a strip-plot design with four replication on a loamy sand
soil in Phitsanulok, a province in the northern part of Thailand.
The operation cost which including cost for land preparation, planting, and seed were
reduced 8% for NT, 32% for DD, and 57% for IT compared with the operation cost in CT
(5,341 Baht/ha). The soil bulk density at 0-5 cm and 5-10 cm soil depth was higher in all three
conservation methods than that in CT method. Additionally, soil moisture content in
conservation tillage methods was higher than that under CT method. The soil moisture
content was lower in burnt rice straw than in the unburnt as well as in cut-straw removed
plots.
Rice straw covering on the soil surface reduced the amount of grass weeds, while, CT
method reduced the amount of grass weeds and increased the amount of broad-leaf weeds.
In this experiment, the percentage of seed emergence was found to be higher under
direct drilling method than in broadcasting. The results obtained from this one cropping
season experiment indicated that the grain yield under three conservation methods was
significantly lower than that under conventional tillage. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-01-02 |
| 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) | Singh, Gajendra; |
| Examination Committee(s) | Salokhe, Vilas M.;Ranamukhaarachchi, S.L.;Zoebisch, Michael Alber; |
| Scholarship Donor(s) | Naresuan University ; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2001 |