This first section briefly describes some of the chemical principles governing the composition of natural waters. We are mainly concerned with the short-term, diurnal and seasonal changes in the water of deepwater rice fields, rather than the long-term processes controlling the composition of the water entering the fields. For a more complete account of the composition of natural waters see Stumm and Morgan (1981).


Photosynthetically Active Radiation Rice Field Water Hyacinth Flash Flood Flood Water 
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Copyright information

© International Research Institute (IRRI) 1992

Authors and Affiliations

  • David Catling

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