Rhizosphere soil nitrogenase (C2H2reduction) as influenced by the nitrogen management in intermediate deep water rice

Autor:	J. L. N. Rao, V. Rajaramamohan Rao, B. B. Reddy
Rok vydání:	1983
Předmět:	Rhizosphere business.product_category Phosphorus chemistry.chemical_element Nitrogenase Biology Nitrogen Plough chemistry.chemical_compound chemistry Agronomy Genetics Urea Nitrogen fixation Animal Science and Zoology Poaceae business Agronomy and Crop Science
Zdroj:	The Journal of Agricultural Science. 101:547-551
ISSN:	1469-5146 0021-8596
DOI:	10.1017/s0021859600038569
Popis:	SUMMARYIn a field experiment, the influence of different forms and methods of application of urea nitrogen on the rice rhizosphere soil nitrogenase was evaluated under simulated intermediate deep water situations. Nitrogenase was high when the soil received small amounts of nitrogen and phosphorus with a water level of 20–25 cm. Moreover, during and after the flash floods the nitrogenase activity was considerably increased. There was a significant reduction in the nitrogenase activity when the nitrogen was applied to the shallow water through urea briquettes, but when it was applied either behind the plough or between the rows, the activity was stimulated. Increased water level of about 50 cm for prolonged periods considerably reduced the nitrogenase activity. Results indicate that the method of application of urea nitrogen and the water level influenced the rhizosphere soil nitrogenase activity under intermediate deep water situations.
Databáze:	OpenAIRE
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