NDLI: Effect of green manure and floodwater algae on diurnal fluctuations of floodwater pH and depth of aerobic soil layer under lowland rice conditions

Content Provider	Springer Nature Link
Author	Thind, H.S. Rowell, D.L.
Copyright Year	1997
Abstract	The present investigation was undertaken to elucidate the effect of floodwater algae and green manure on floodwater pH and depth of aerobic soil layer which are mainly responsible for the nitrogen losses in lowland rice production systems. The study was conducted in an environmental chamber using a sandy loam soil. Cylindrical plastic bottles 7 cm in diameter were used and 5 cm soil layer covered with 5 cm deep floodwater was created in each bottle to simulate submerged rice conditions. The presence of algae in the floodwater increased the floodwater pH owing to removal of CO$_{2}$ during photosynthesis during the day, the value decreasing again during the night. Addition of green manure, without algal growth, depressed the pH for the first week and after 4 weeks of incubation. With algae, the application of green manure in vitro resulted in lower diurnal pH increases especially for the first 2 weeks of incubation and a consistently higher morning pH throughout the study. The addition of green manure eliminated the aerobic soil layer below the soil-water interface, presumably because green manure cause a high O$_{2}$ demand owing to increased microbial activity which results in a lower Eh value.
Starting Page	161
Ending Page	165
Page Count	5
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	192
Issue Number	2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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