Soil and fertilizer nitrogen transformations under alternate flooding and drying moisture regimes

Sahrawat, K L (1980) Soil and fertilizer nitrogen transformations under alternate flooding and drying moisture regimes. Plant and Soil, 55 (2). pp. 225-233. ISSN 0032-079X

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A study of changes in NH4 + and NO3 ––N in Maahas clay amended with (NH4)2SO4 and subjected to 4 water regimes in the presence and absence of the nitrification inhibitor N-Serve (Nitrapyrin) showed that the mineral N was well conserved in the continoous regimes of 50% and 200% (soil weight basis) but suffered heavy losses due to nitrification-denitrification under alternate drying and flooding. N-Serve was effective in minimizing these losses. Another incubation study with 3 soils showed that after 10 cycles of flooding and drying (either at 60°C or 25°C), the ammonification of soil N was enhanced. Nitrification of soil as well as fertilizer NH4 + was completely inhibited upto 4 weeks by the treatments involving drying at high temperature. Flooding and air drying at 25°C, on the other hand, enhanced ammonification of soil N but retarded nitrification. These treatments, however, enhanced both ammonification and nitrification of the applied NH4 + fertilizer N. Under flooded conditions rate of NH4 + production was faster in soils that were dried at 60°C or 25°C and then flooded as compared to air dried soils. It is concluded that N losses by nitrification-denitrification and related N transformations may be considerably altered by alternating moisture regimes. Flooding and drying treatments seem to retard nitrification of soil N but conserve that of fertilizer NH4 + applied after these treatments.

Item Type: Article
Uncontrolled Keywords: Ammonification - Mineral nitrogen recovery - Nitrapyrin (N-Serve) - Nitrification - Soil drying - Soil pH
Subjects: Others > Soil Science
Others > Fertilizer Applications
Depositing User: Mr Sanat Kumar Behera
Date Deposited: 16 Nov 2011 13:46
Last Modified: 23 Jan 2012 08:18
Official URL:
Funders: International Rice Research Institute
Acknowledgement: The work reported was carried out under a postdoctoral fellowship at the International Rice Research Institute. The author is grateful to Dr. F. N. Ponnamperuma, Principal Soil Chemist for his valuable suggestions during the course of the work and the write up of the manuscript.
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