Growth Inhibition of Rice by Water Drainage during Fallow at IRRI

• NOZOE Takuhito

  Crop, Soil and Water Science Division, International Rice Research Institute (IRRI) Crop Production and Environment Division, Japan International Research Center for Agricultural Sciences (JIRCAS)

• RODRIGUEZ Reynaldo

  Crop, Soil and Water Science Division, International Rice Research Institute (IRRI)

• AGBISIT Ruth

  Crop, Soil and Water Science Division, International Rice Research Institute (IRRI)

抄録

In a rice cultivation experiment at the International Rice Research Institute (IRRI), water drainage during the fallow period inhibited the growth of paddy rice, especially during the early stage of subsequent cultivation. This symptom became more prominent when rice straw was not applied, and when the amount of fertilizer applied was small. The application of a mixture of nitrogen, phosphorus, and potassium fertilizers reduced this inhibition. The amounts of phosphorus in the growth-inhibited rice and soil were smaller than those without growth inhibition. The findings suggest that one of the factors that inhibited rice growth was phosphorus deficiency. The inhibition was associated with high soil pH and low Fe(II) content in the problem soil. There was a negative correlation between soil pH and Fe(II) content. Water drainage during fallow decreased the amount of Fe(II) in the soil because Fe(II) was oxidized to Fe(III) under oxidative conditions. During the subsequent cultivation season, the amount of Fe(II) in the soil was low and the soil pH was high. The application of rice straw improved rice growth. The phosphorus deficiency of growth-inhibited rice was associated with a small amount of available phosphorus in soil presumably because of the high soil pH and the adsorptopn of phosphorus to Fe(III) oxides in the soil.

収録刊行物

• Japan Agricultural Research Quarterly: JARQ

  Japan Agricultural Research Quarterly: JARQ 40 (4), 361-367, 2006

  国立研究開発法人　国際農林水産業研究センター

キーワード

• ferrous iron
• pH
• phosphorus deficiency
• the tropics

詳細情報

• CRID: 1390001204702256640
• NII論文ID: 130003377660
• DOI: 10.6090/jarq.40.361
• ISSN: 21858896
• ISSN: 00213551
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可