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Influence of phosphorus application to flood water on oxygen concentrations and survival of rice during complete submergence

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Title Influence of phosphorus application to flood water on oxygen concentrations and survival of rice during complete submergence
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Creator Ramakrishnayya, G., Setter, T.L., Sarkar, R.K., Krishnan, P., Ravi, I.
 
Subject Flooding submergence, O2 concentration, Phosphorus, Rice, Submergence
 
Description Not Available
Low concentrations of phosphorous were added to the floodwater of submerged rice in an
attempt to regulate algal growth, so as to increase floodwater O2 concentration and plant
survival during submergence for up to 12 days. Increasing the phosphorus concentration of the
floodwater by 1 ppm increased algal growth by at least 4-fold based on chlorophyll concentrations, and increased floodwater O2 concentrations to over twice air saturation. However,
additions of phosphorus reduced rice plant survival during submergence by up to 35%. The
adverse effects of a high phosphorus concentration in the floodwater were mainly attributed to
competition between the algae and the submerged rice for CO2 and, perhaps, light. The
importance of photosynthesis during the submergence of rice was supported by the results of
experiments in which floodwater CO2 concentration was manipulated by altering pH. The
survival of an intolerant rice cultivar during submergence increased from 0 to 17 and 62% at
pH 8, 7, and 5 respectively, while floodwater CO2 concentrations at these pHs would have
increased from 0.02 to 0.3 and 1.0 mol m73 respectively. The results were used to question the
importance of floodwater O2 concentrations above anoxia for submergence tolerance of rice.
ICAR, IRRI
 
Date 2022-11-11T10:49:18Z
2022-11-11T10:49:18Z
1999-04-01
 
Type Article
 
Identifier RAMA KRISHNAYYA, G., SETTER, T., SARKAR, R., KRISHNAN, P., & RAVI, I. (1999). INFLUENCE OF PHOSPHORUS APPLICATION TO FLOODWATER ON OXYGEN CONCENTRATIONS AND SURVIVAL OF RICE DURING COMPLETE SUBMERGENCE. Experimental Agriculture, 35(2), 167-180. doi:10.1017/S0014479799002045
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http://krishi.icar.gov.in/jspui/handle/123456789/75019
 
Language English
 
Relation Not Available;
 
Publisher Cambridge University Press