Development of a water storage-type deep-irrigation method for rice aimed at increasing the environment-protecting function of paddy fields - Growth and yield of rice in a year with a hot summer in the Tohoku region

Yusuke Goto, Mitsuo Saito, Satoshi Nakamura, Teiji Nakamura, Toru Kato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We are developing a deep-irrigation method to grow rice at a steady high yield in the Tohoku region, while increasing the function of water storage, which is one of the functional benefits of paddy fields in environmental protection. The main objective for promoting the water storage function is to delay the runoff of river-water, which is abundant due to snow melting and rainfall in the rainy season, until summer when there is often a shortage of water supply. We designed a water management system taking into consideration the following points: 1) To increase the water storage function of the paddy field, the water depth is kept as deep as possible using the present levee (the maximum water depth, 25-30 cm). 2) Considering the steady high yield in the Tohoku region, the water depth at the meiotic stage is kept at 25-30 cm to protect the plant from low temperatures. 3) The water depth is increased continuously until mid-July when water is abundant, assuming the water supply is steady, and the depth is controlled to have only one peak. 4) The yield is increased by deep irrigation, referring to the yield-increasing technique of the deep-irrigation method used by an outstanding farmer. Since this method was developed to cope with cool summers, the yield by this method may be lower in years with hot summers, when the yield by customary cultivation is high. In 1994, we had a very hot summer, and the rice yield in the Tohoku region was high. In this study, we compared the growth and yield of rice cultivated by the water storage-type deep-irrigation method and the customary cultivation method in that year. Since the yield by the water storage-type deep-irrigation method was not inferior to that of customary cultivation, this method was suggested to be useful even in years with hot summers.

Original languageEnglish
Pages (from-to)480-481
Number of pages2
JournalJapanese Journal of Crop Science
Volume68
Issue number4
Publication statusPublished - 1999 Dec 1

Keywords

  • Deep water
  • Environmental protection
  • Irrigation
  • Paddy field
  • Rice
  • Yield

ASJC Scopus subject areas

  • Food Science
  • Agronomy and Crop Science
  • Genetics

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