Optimum seed rates in wet seeded rice culture in the Mekong Delta of Vietnam

Country
Viet Nam

Description

[Synopsis]

Double and triple cropping in wet seeded rice culture(WSC), which is broadcasting the pre-germinated seeds on the wet soil after the land preparation and draining out the standing water on the paddy fields, is predominant in the Mekong Delta area. The rice yields per hectare in the WSC have been stagnated since 1995. A feature in the WSC is to use seed rates as high as 200 to 300kg ha-1 . So, we tried to identify the optimum seed rates in order to increase the yields per hectare and decrease the seed rates. The field trials on the seed rates were carried out in the fields at Cuu Long Delta Rice Research Institute and two other sites in Can Tho Province. Number of panicles per m2 significantly decreased as the seed rates decreased from the conventional one (200kg ha-1 ) in both dry and wet seasons. In contrast, the filled grains per panicle significantly increased as seed rates decreased from the conventional one in both seasons. As the 1000 filled grains weight at different seed rates were almost same, the grain yields at different seed rates were decided by the number of filled grains per m2 . The highest yields were obtained at the seed rates from 50 to 100 kg ha-1 in both seasons. However, taking the establishment of sufficient number of seedlings into consideration, 80 to 100 kg ha-1 were recommended as the practical seed rates. The recommended seed rates also have another advantage of saving 1/2 to 1/3 of the conventional seed rates. It is important that the seed rates should be applied to the paddy fields with smooth land level, and good irrigation and drainage facilities, and to the renovated farmers.

Affiliation

Japan International Research Center for Agricultural Sciences Crop Production and Postharvest Technology Division

Classification

Administration

Term of research

FY2000 (FY1998-2000)

Responsible researcher

HIRAOKA Hiroyuki ( Crop Production and Postharvest Technology Division )

TAN Pham Sy ( Cuulong Delta Rice Research Institute )

KHUONG T. Quang ( Cuulong Delta Rice Research Institute )

HUAN Tran Ngoc ( Cuulong Delta Rice Research Institute )

ほか
Japanese PDF

2000_15_A3_ja.pdf797.19 KB

Related Research Highlights