Land levelling under direct seeding rice culture in Malaysia.
Fujii, H.; Meng ChangCho;
JIRCAS Journal Year: 1995 Vol: 2 Issue: 2 Pages: 79-86 Ref: 5 ref.
1995
บทคัดย่อ
The improvement of field surface configuration by land levelling is an important measure for weed control and adequate seedling establishment, the major constraints on stable direct seeding culture. Land levelling experiments were carried out in fields in the Muda area using a motor grader and tractor to analyse the difference in improvement depending on the type of machines and field configuration level required for stable seedling establishment. The field surface was improved (s.d=3.8 cm) through land levelling using a motor grader coupled with a laser machine control system (LMCS). The field surface level was also improved (s.d=2.2-3.2 cm) using a tractor with rear bucket in the absence of a laser machine control system. Thus, by using the tractor which is very common in this area, it was possible to reach a s.d value of 2.5 cm without a laser machine control system. Furthermore, the analysis of the relationship between the s.d value and the percentage of vacant spot areas revealed that, in w
et direct seeding, adequate seedling establishment, in which the percentage of vacant spot areas was less than 4%, could be achieved when the s.d value of the field surface level was 2.5 cm and field ditches were provided. Theoretically a s.d value of 2.0 cm which can be obtained by using a bulldozer coupled with LMCS is suitable. Based on the fact that (1) it is difficult to obtain a s.d value of 2 cm without the use of a laser bulldozer and that (2) by the improvement of the field surface with a s.d value of 2.5 cm a percentage of vacant spot areas of less than 4% can be attained, a s.d value of 2.5 cm for the field surface level is recommended as the standard of land levelling in the Muda area.