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Temperature Regime of Azolla under Rice
Author(s) -
Kröck T.,
Alkämper J.,
Watanabe I.
Publication year - 1988
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1988.tb00675.x
Subject(s) - azolla , agronomy , sowing , paddy field , canopy , environmental science , diurnal temperature variation , air temperature , poaceae , rice plant , crop , biology , botany , atmospheric sciences , physics
The effects of different rice canopies on the temperature regime of the Azolla plants and their immediate environment were studied in a paddy field in the Philippines. Diurnal temperature cycles were measured in the field with thermocouples. Without rice plants Azolla temperature reached of up to 41°C, which was 6°C above air temperature. The rice canopy reduced the temperature of Azolla by up to 5°C. The relationship between the temperature of Azolla and of its environment (air and floodwater) is discussed. Differences between the two planting patterns of rice were obvious. With 20 × 20 cm spacing temperatures were reduced to a greater extend and at an earlier rice crop stage than with double‐narrow‐row spacing. Under extremely high temperatures the nee canopy may improve the conditions for the growth of Azolla.