Effects of drainage after submerged direct-seeding on the effectiveness of fertilized nitrogen and the growth and yield of rice plants

S. Yoshinaga, M. Nishida, K. Wakimoto, K. Tasaka, K. Matsushima, T. Togashi, K. Shimotsubo

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Drainage after seeding has recently been practiced in general for the improvement of seedling emergence in submerged direct-seeding rice (Oryza sativa L.) cultivation. We examined the relationship between water management after direct-seeding and the effectiveness of fertilized nitrogen to clarify the effects of drainage on the growth and yield of rice. It was confirmed that the drainage after seeding improved the seedling emergence rate and stimulated the initial growth of the seedling. When controlled release fertilizer (LP 100) was applied as basal dressing, water management after seeding had no effect on the growth and yield. However, when ammonium sulfate was applied, the yield was reduced by the drainage after seeding, due to the decrease in nitrogen uptake of rice at the panicle initiation stage, and resulting reduction in the number of spikelets. In this case, nitrogen uptake seemed to be reduced because nitrogen uptake in the early growth stage was increased by the increase in initial growth and tillering and because the content of ammonium nitrogen in soil was reduced by nitrification of the fertilized nitrogen during drainage. These results showed that the suppression of nitrogen uptake at the initial growth stage and the avoidance of nitrogen deficiency at the intermediate growth stage, are important to stabilize not only seedling emergence but also growth and yield for the management of drainage after seeding.

Original languageEnglish
Pages (from-to)481-486
Number of pages6
JournalJapanese Journal of Crop Science
Volume69
Issue number4
DOIs
Publication statusPublished - 2000

Keywords

  • Drainage
  • Growth
  • Nitrogen fertilizer
  • Nitrogen uptake
  • Rice
  • Seedling emergence
  • Submerged direct-seeding

ASJC Scopus subject areas

  • Food Science
  • Agronomy and Crop Science
  • Genetics

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