Abstract
AbstractAzolla, a free floating waterfern which is used as green manure for rice, forms mats that cover the water surface. Light intensity, oxygen concentration and pH in the water under the Azolla cover were determined in the laboratory and in the field. The relative light intensity under a full cover of Azolla was about 10 percent. Azolla reduced the maximum oxygene concentration in water by 3–8 ppm. The pH was lowered by 1.4 points. The relationship between these characters and possible effects on the utrient conditions in floodwater and soil are discussed.
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