KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)
- Volume 43 Issue 1
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- Pages.49-53
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- 1998
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- 0252-9777(pISSN)
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- 2287-8432(eISSN)
Nitrogen Management with Split Application of Urea for Direct-Seeding Rice in Wet Paddy
- Lee, Ho-Jin (Department of Agronomy, Seoul National University) ;
- Seo, Jun-Han (Department of Agronomy, Seoul National University) ;
- Lee, Jung-Sam (Department of Agronomy, Seoul National University) ;
- Jung, Yong-Sang (Department of Agricultural Chemistry, Kangwon University) ;
- Fred E. Below (Department of Crop Science, University of Illinois)
- Published : 1998.03.01
Abstract
Direct-seeding has major advantages such as labor and cost saving by eliminating preparation of seed bed and transplanting. But, it required increased input of fertilizers and pesticides because of the extended paddy period. Direct seeding in wet paddy (DSWP) gives faster growth and more uniform seedling emergence than direct-seeding in dry paddy. This research had an objective to develop an efficient N management practices for DSWP with split application of N fertilizer. A paddy field experiment was conducted to evaluate effects of starter N and N-topdressing which was delayed N application until 5-leaf stage, with comparison to transplanting (TP). Total amount of N application were two levels; 110kg and 77kg/ha. The N applications were split four times during rice growth stages; starter, topdressing at 5-leaf stage, top dressing at tillering stage, and topdressing at panicle initiation stage. DSWP had more tillers/