+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn

+ Translate
+ Recently Requested

Nitrogen fixation in paddy soils part 1 factors affecting nitrogen fixation

Nitrogen fixation in paddy soils part 1 factors affecting nitrogen fixation

Soil Science and Plant Nutrition 24(3): 357-366

The 4 long-term experimental plots (Umbric haplaquept) with different fertilizer treatment at Central Agriculture Experimental Station in Konosu City, Saitama Prefecture [Japan] were used for the sites of investigation. The 4 plots were NF (applied with no fertilizer), IF (applied with inorganic fertilizers), GM (applied with green manure and CaCO3) and OM (applied with manure and inorganic fertilizers). Flooded water, floating weed [Pithophora zelleri] upper (0-2 cm) and lower (2-10 cm) parts of Apg horizon and rhizosphere were collected from each plot before flooding, during flooding, and after drainage. These samples were analyzed for [microbial] N2 fixing activity by acetylene reduction method, pH, Eh [oxidation-reduction potential], and contents of Fe2+, NH4+, chlorophyll-type compounds and water-soluble carbohydrates. The N2-fixing activity of all samples showed almost the same pattern of change with time: very low before flooding, rapidly increased after flooding, the maximum value at the maximum tillering stage of rice plant, declined afterwards and reached a very low value after drainage. Rough estimation of the N2-fixing capacity of each part of the paddy field revealed that the most important site of the N2 fixation was the reduced Apg horizon, that the importance of flooded water and/or the oxidized layer in the N2 fixation was rather low except in infertile soil, and that the role of rhizosphere in the N2 fixation could not be neglected also in Japan. Reduced condition and content of easily decomposable organic substances were judged to be main factors which control the N2-fixing activity in the flooded soil on the basis of correlations between the N2-fixing activity and several analytical data of the paddy soils.

(PDF emailed within 1 workday: $29.90)

Accession: 005986573

Download citation: RISBibTeXText

Related references

Nitrogen fixation in paddy soils. 1. Factors affecting N2 fixation. Soil Science and Plant Nutrition 24(3): 357-365, 1978

Nitrogen-fixing microorganisms in paddy soils. Part I. Characteristics of the nitrogen fixation in paddy soils. Soil Plant Food, 1: 102-104, 1955

Nitrogen-fixing micro-organisms in paddy soils. XVII. Nitrogen fixation in a mixed culture of photosynthetic bacteria (Rhodopseudomonas capsulatus species) and other heterotrophic bacteria (7). Stimulative effects of pyruvic acid on nitrogen fixation. Soil Sci. Pl. Nutr, 11: 4, 36-39, 1965

Nitrogen fixation in paddy soils 3. nitrogen fixation and its active sites in soil and rhizosphere. Soil Science and Plant Nutrition 25(2): 165-172, 1979

Some factors affecting asymbiotic nitrogen fixation in soils as measured by nitrogen 15 enrichment. Agronomy Journal: 251-254, 1972

Nitrogen fixation in paddy soils part 2 a model experiment for paddy soil. Soil Science and Plant Nutrition 24(3): 367-374, 1978

Nitrogen fixation in paddy soils. 3. N2 fixation and its active-sites in soil and rhizosphere. Soil Science and Plant Nutrition 25(2): 165-171, 1979

Factors affecting the uptake of nitrate and nitrogen fixation in field beans. Effect of nitrate supply on nitrogen fixation. UK, Long Ashton Research Station: Report 1979: 76-77, 1980

Nitrogen fixation. Application of the acetylene reduction method in nitrogen fixation studies in paddy soil. International Rice Research Institute Annual Report, 1968. 137-139, 1968

The respiratory costs of nitrogen fixation in soybean cowpea and white clover part 2 comparisons of the cost of nitrogen fixation and the utilization of combined nitrogen. Journal of Experimental Botany 30(114): 145-154, 1979

Atmospheric nitrogen fixation by free living microorganisms part 5 effect of concentration of fixed nitrogen in the medium on nitrogen fixation. Izvestiya Sibirskogo Otdeleniya Akademii Nauk SSSR Seriya Biologicheskikh Nauk 5(1): 16-23, 1978

Studies on the nitrogen-fixation efficiency of Casuarina (II). Factors affecting the formation and nitrogen-fixation efficiency of nodules. Quarterly Journal of Chinese Forestry 20(1): 29-51, 1987

Effect of nitrogen sources on nitrogen fixation of anabaena spp isolated from paddy soils. Proceedings of the National Science Council Republic of China Part B Basic Science 7(3): 317-321, 1983

Effects of straw and nitrogen fertilizer application on anaerobic nitrogen fixation in paddy soils. Izvestiya Timiryazevskoi Sel' skokhozyaistvennoi Akademii (3): 107-112, 1984

Influence of ammonium nitrogen on nitrogen fixation in paddy soils. Soil Science 131(3): 140-144, 1981