Estimation of associative nitrogen fixation in relation to water regime and plant nutrition in a long-term pot experiment with rice (Oryza sativa L.)

Trolldenier, G.

doi:10.1007/bf00257648

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…A significant negative correlation (r = -0-90, P < 005, n = 60) between acetylene reducing activity (ARA) and amount of N fertilizer was observed. These results agree with those reported by Trolldenier (1987) in pot assays and Prosperi et al (1992) in laboratory experiments. The contribution of N 2 -fixing micro-organisms other than cyanobacteria to N fixation seems to be negligible, since a significant positive correlation (r = 0-84, P < 005, n = 35) between mean values of ARA and mean values of N 2 -fixing cyanobacteria was observed.…”

Section: Nitrogenase Activitysupporting

confidence: 93%

“…In plots with 140 kg N/ha, at least 2 5 % of the N applied was not used by the plants, and therefore it could have contributed to the pollution of surrounding waters. In other instances, and in agreement with Trolldenier (1987), the difference between removed and applied N was positive and higher at lower N input rates. This difference can be explained, as suggested by Trolldenier (1987) and Roger et al (1993), by the utilization of dinitrogen fixation as an alternative source of N, since soil N content did not decrease after three crop seasons (Table 6) and the estimated amount of N supplied by irrigation water ( < 10 kg N/ha per year) was not enough to explain such a difference.…”

Section: Tv Responsessupporting

confidence: 83%

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Effect of nitrogen rates on rice growth and biological nitrogen fixation

et al. 1996

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S U M M A R YThe effect of different rates (0-140 kg/ha) of nitrogen fertilizers on soil cyanobacteria and rice crop performance were studied in a rice-cropping system on an alkaline Fluvent soil at Valencia, Spain, during three consecutive crop seasons . The results showed that the rice fields of Valencia favour the development of N 2 -fixing cyanobacteria. Nitrogen fixation varied during the cultivation cycle, reaching its highest values at the maximum tillering stage, 5-6 weeks after sowing, and showed a positive correlation with the abundance of cyanobacteria and a negative correlation with the amount of N fertilizers used. Grain yield increased with increasing amounts of N fertilizers up to 70 kg N/ha. N rates appeared to affect grain yield by causing variations in the number of panicles/m 2 . Leaf chlorophyll readings at the end of the tillering stage were positively correlated with the number of panicles/m 2 , suggesting that it could be a useful parameter for predicting productivity. There was a significant increase in the N uptake of the rice but a decrease in the apparent N recovery and Nuse efficiency of applied fertilizer N, with the application of increasing rates of N fertilizer. In all instances, except in plots fertilized with 140 kg N/ha, the amount of N removed by plants was significantly higher than that applied as N fertilizer. The differences were positively correlated with the values for N fixation, suggesting a significant contribution by N fixation to rice production. These results show that a rational use of biological N fixation, in combination with inorganic N fertilization, would permit the input of N fertilizers to be reduced by c. 50 % without any significant loss of productivity and with an ecological benefit for the whole ecosystem.

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Section: Nitrogenase Activitysupporting

confidence: 93%

Section: Tv Responsessupporting

confidence: 83%

Effect of nitrogen rates on rice growth and biological nitrogen fixation

et al. 1996

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“…In similar trials, Trolldenier (1987) found balances negatively correlated with the amount of N applied, ranging from -440 to +418 mg N crop -1 pot -1. Extrapolated values averaged 19 kg N ha -~ crop -1 with 65 kg N ha -~, -0.3 with 112 kg N, and -1 4 with 146 kg N. Using available N of a stabilized 15N-labelled soil as control, Zhu et al (1984) estimated that when no N fertilizer was applied and photodependent BNF was controlled, heterotrophic BNF contributed 16-21% of rice N, or 11-16 kg N ha -~ crop -1…”

Section: Total Heterotrophic Bnfmentioning

confidence: 78%

“…Therefore, there is renewed interest in pot studies ( A p p et al, 1986;Singh and Singh, 1987;Trolldenier, 1987). In a 4-crop experiment comparing organic N (Azolla and B G A ) and urea, Singh and Singh (1987) found positive N balances ranging from 13 to 163 mg N crop -1 pot -~.…”

Section: Nitrogen Balance and Bnf Contribution In Wetland Ricementioning

confidence: 99%

“…Data are from 14 reports, including both field and pot studies. To allow for comparisons, data from pot experi- (19751;App et al (1980App et al ( , 1984App et al ( , 1986; De and Sulaiman (1950); Firth et al (1973); Greenland and Watanabe (19821;Inatsu and Watanabe (1969); Konishi and Seino (1961); Koyama and App (1979); Santiago-Ventura et al (1986); Singh and Singh (19871;Trolldenier (1987); and Willis and Green (1948). 177 values obtained in pots were extrapolated to kgNha t i crop on an area basis.…”

Section: Nitrogen Balance and Bnf Contribution In Wetland Ricementioning

confidence: 99%

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