Biological N2 Fixation in wetland rice fields: Estimation and contribution to nitrogen balance

Roger, Pierre-Armand; Ladha, J. K.

doi:10.1007/978-94-017-0910-1_3

Cited by 67 publications

(42 citation statements)

References 18 publications

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“…In the soil, they are reported to improve organic content, water holding capacity, nitrogen status, and release vitamins, plant stimulating hormones, extra cellular polysaccharides and also solubilize phosphates [23], [24]. More than half of the total nitrogen used in paddy crop derives from the native soil nitrogen pool which is maintained through biological nitrogen fixation by both hetero- and autotrophs in soil [25]. Thus, use of cyanobacterial biofertilizer is considered to be a good management of paddy fields since their use not only increases fertility of the soil but is also eco-friendly.…”

Section: Introductionmentioning

confidence: 99%

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

et al. 2013

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This study deals with anilofos tolerance and its mineralization by the common rice field cyanobacterium Synechocystis sp. strain PUPCCC 64. The organism tolerated anilofos up to 25 mg L−1. The herbicide caused inhibitory effects on photosynthetic pigments of the test organism in a dose-dependent manner. The organism exhibited 60, 89, 96, 85 and 79% decrease in chlorophyll a, carotenoids, phycocyanin, allophycocyanin and phycoerythrin, respectively, in 20 mg L−1 anilofos on day six. Activities of superoxide dismutase, catalase and peroxidase increased by 1.04 to 1.80 times over control cultures in presence of 20 mg L−1 anilofos. Glutathione content decreased by 26% while proline content was unaffected by 20 mg L−1 anilofos. The test organism showed intracellular uptake and metabolized the herbicide. Uptake of herbicide by test organism was fast during initial six hours followed by slow uptake until 120 hours. The organism exhibited maximum anilofos removal at 100 mg protein L−1, pH 8.0 and 30°C. Its growth in phosphate deficient basal medium in the presence of anilofos (2.5 mg L−1) indicated that herbicide was used by the strain PUPCCC 64 as a source of phosphate.

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Section: Introductionmentioning

confidence: 99%

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

et al. 2013

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“…Among the important issues addressed was that rice derives only a basal level of its N nutrition indirectly from the N 2 -fixing activities of diverse, free-living and loosely associated diazotrophs in its agroecosystem (Ladha 1986;Yanni 1991Yanni , 1992Yanni , 1998Roger and Ladha 1992;Yanni and Abd El-Rahman 1993;Yanni et al , 2000Yanni and Abd El-Fattah 1999). Serious economic and environmental problems associated with the use of inorganic and organic fertilizers to enhance rice production were identified.…”

Section: Introductionmentioning

confidence: 99%

The beneficial plant growth-promoting association of Rhizobium leguminosarum bv. trifolii with rice roots

Yanni¹,

Rizk²,

El-Fattah³

et al. 2001

Functional Plant Biol.

166

117

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This paper summarizes a multinational collaborative project to search for natural, intimate associations between rhizobia and rice (Oryza sativa L.), assess their impact on plant growth, and exploit those combinations that can enhance grain yield with less dependence on inputs of nitrogen (N) fertilizer. Diverse, indigenous populations of Rhizobium leguminosarum bv. trifolii (the clover root-nodule endosymbiont) intimately colonize rice roots in the Egyptian Nile delta where this cereal has been rotated successfully with berseem clover (Trifolium alexandrinum L.) since antiquity. Laboratory and greenhouse studies have shown with certain rhizobial strain-rice variety combinations that the association promotes root and shoot growth thereby significantly improving seedling vigour that carries over to significant increases in grain yield at maturity. Three field inoculation trials in the Nile delta indicated that a few strain-variety combinations significantly increased rice grain yield, agronomic fertilizer N-use efficiency and harvest index. The benefits of this association leading to greater production of vegetative and reproductive biomass more likely involve rhizobial modulation of the plant's root architecture for more efficient acquisition of certain soil nutrients [e.g. N, phosphorus (P), potassium (K), magnesium (Mg), calcium (Ca), zinc (Zn), sodium (Na) and molybdenum (Mo)] rather than biological N 2 fixation. Inoculation increased total protein quantity per hectare in field-grown grain, thereby increasing its nutritional value without altering the ratios of nutritionally important proteins. Studies using a selected rhizobial strain (E11)

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“…Soybean is assumed to fix nitrogen at 80 kg N hm -2 (Smil, 1999). Flooded paddy field provided a unique set of conditions for biological nitrogen fixation by autotrophic nitrogen-fixing blue-green algae and heterotrophic nitrogenfixing bacteria (Roger and Ladha, 1992), and we take a fixing rate of 30 kg N hm -2 (Zhu and Wen, 1992) as the default. Wheat, maize, cotton and oil rape are assumed to fix nitrogen at 15 kg N hm -2 (Burns and Hardy, 1975).…”

Section: Nitrogen Input To the Catchmentmentioning

confidence: 99%

Study on Water and Nitrogen Cycle in Jurong Reservoir Catchment

Wang

2012

2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering

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The annual nitrogen budget, the annual organic nitrogen output intensity and nitrate nitrogen output intensity from the different land use and land cover types, and the distribution law of the organic and nitrate nitrogen loss in a year along with the runoff in the Jurong Reservoir catchment are studied. By analyzing the data of N related agricultural activities through the household interviews method, the nitrogen input to the catchment is estimated at 1710.881×10 3 kg N year -1 , including that from chemical fertilizer, human and livestock excreta, biological nitrogen fixation, seed nitrogen input and atmospheric deposition. The nitrogen input to the catchment via chemical fertilizer is estimated at 1253.440×10 3 kg N year -1 and it is far higher than that from the other approaches. SWAT model is used to simulate the organic nitrogen and nitrate nitrogen loss per month along with the runoff in the catchment. The annual organic nitrogen and nitrate nitrogen output intensity on the different land use and land cover types from 2005 to 2007 are calculated. The results show that the organic nitrogen output intensity on the different land use and land cover types are 19.94 kg hm -2 year -1 from the dry farmland, 15.65 kg hm -2 year -1 from the residential area and roads,10.21 kg hm -2 year -1 from the paddy field, 4.69 kg hm -2 year -1 from the tea gardens and artificial forest, and 1.95 kg hm -2 year -1 from the water area, in a descending order. The nitrate nitrogen from dry farmland is 0.93 kg hm -2 year -1 , which is more than that from the land with others. With analyzing of the annual organic nitrogen and nitrate nitrogen output, it is found that the nitrogen losses are concentrated in the rainy season period.

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Biological N2 Fixation in wetland rice fields: Estimation and contribution to nitrogen balance

Cited by 67 publications

References 18 publications

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

Anilofos Tolerance and Its Mineralization by the Cyanobacterium Synechocystis sp. Strain PUPCCC 64

The beneficial plant growth-promoting association of Rhizobium leguminosarum bv. trifolii with rice roots

Study on Water and Nitrogen Cycle in Jurong Reservoir Catchment

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