Experiments on nitrogen fixation by nodulated lucerne

Bell, Frank F.; Nutman, P. S.

doi:10.1007/bf02661854

Cited by 33 publications

(9 citation statements)

References 20 publications

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“…Bell and Nutman, 1971;Date, 1977). Field experiments require between 100 and 120 days to complete for temperate legume/Rhizobium associations and slightly less for the tropicals.…”

Section: Discussionmentioning

confidence: 94%

“…Appropriate agronomic experiments have been designed (Bell and Nutman, 1971;Date, 1977) but are subject to the hazards of field work (Brockwell, 1980) and take at least several months to complete. Alternatively, laboratory experiments in microbiologically-controlled conditions can be used to enumerate rhizobia in soil and to evaluate their effectiveness.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the symbiotic nitrogen-fixing potential of soils by direct microbiological means

1988

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A method for estimating the nitrogen-fixing capacity of a population of rhizobia resident in soil is presented. Legume test plants, growing under microbiologically-controlled conditions in test tubes packed with a vermiculite substrate moistened with a nitrogen-free plant nutrient solution, are inoculated directly with a suspension of the soil under examination. Rhizobia in the soil nodulate the test plants, and the amount of foliage dry matter produced in the 28 days after inoculation is regarded as an index of their effectiveness. An inoculum of at least 30, and preferably 100, rhizobia is needed to ensure that nitrogen fixation is not masked by delayed nodulation. The new method is tentatively described as the 'whole-soil inoculation' technique.Appraisals were made with Trifolium subterraneum L. and Rhizobium trifolii and with Medieago sativa L. and R. meliloti. Soil-borne pathogens did not interfere with plant growth. The whole-soil inoculation technique was less tedious and time-consuming than an alternative method which involved extracting representative isolates from the soil and testing their effectiveness individually, and appeared to give more realistic values for the nitrogen-fixing capacity of the soil as a whole. Used in association with a field experiment, the whole-soil inoculation technique confirmed microbiologically that there had been an agronomic response to surface application of inoculant to poorly-nodulated T. subterraneum pasture.It is submitted that this technique for determining the effectiveness of rhizobia in soil, combined with a plant-infection method for counting rhizobia, can be a reliable guide to the need for inoculation in the field.

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“…Bell and Nutman, 1971;Date, 1977). Field experiments require between 100 and 120 days to complete for temperate legume/Rhizobium associations and slightly less for the tropicals.…”

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Evaluation of the symbiotic nitrogen-fixing potential of soils by direct microbiological means

1988

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“…Nodule weight, fresh or dry, and nodule number have traditionally been used to indicate or to quantify dinitrogen fixation in legumes (BELL & NUTMAN, 1971 ;BROCKWELL, 1971 ;BuRRIs, 1972) .…”

Section: Resultsmentioning

confidence: 99%

“…Others also have found that nodule mass, size, and number are not always indicative of dinitrogen-fixing activity (BELL & NUTMAN, 1971 ;BURRIS, 1972) . However, under the higher temperature regime, where the plants had better Euphvtica30 (1981) yields and correspondingly greater amounts of dinitrogen fixation had occurred, these nodule factors were significantly related to the absolute amount of dinitrogen fixation that had occurred .…”

Section: Discussionmentioning

confidence: 99%

Selection for dinitrogen-fixing ability in Phaseolus vulgaris L. at two low-temperature regimes

Rennie

Kemp

1981

Euphytica

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“…The nutrient losses or outputs were mainly plant uptake and leaching losses. Biological N fixed by legumes in the ley was calculated according to the percentage of legumes in the sward and innoculation of lucerne (Bell andNutman 1971. Broadbent, Nakaskhima, andGrace 1982;Fagerberg, Salomon, and Steineck 1993;Lapinskas 1998).…”

Section: Methodsmentioning

confidence: 99%

Nitrogen and Phosphorus Losses with Drainage Runoff and Field Balance as a Result of Crop Management

Bučienė

Antanaitis²,

Mašauskienė³

et al. 2007

Communications in Soil Science and Plant Analysis

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Two high-input and two low-input crop-management systems, one reference treatment with field crop rotation, and one long-term moderately treated pasture were studied and compared in respect to nitrogen (N) and phosphorus (P) flow and balance. The experiment was conducted on tile-drained plots covered by Endocalcari-Endohypogleyic Cambisols. The least Nmin (mineral nitrogen) leaching losses were registered in the pasture. The high-input management systems did not consistently result in larger losses of Nmin [mainly nitrate (NO 3 )-N] and Ptot (total phosphorus) in the drainage water. The leaching of Nmin depended more on amount of the drainage water leaving the site, soil organic matter/humus, and soil Ntot content (positive correlation) as well as the content of water-stable aggregates (negative correlation). The higher concentrations of Ptot in drainage runoff in the organic (ORG1) treatment and pasture during the second rotation might be conditioned of ley root system impact. Ptot leaching was positively correlated to the available P 2 O 5 -AL in the topsoil. Negative N field balance was determined in all the treatments, except ORG2 and LTP in 1995-1999, whereas it was negative only in the reference plots (REF) in the 2001-2003 rotation because of the increased crop residues and drier climatic conditions. Phosphorus balance was slightly negative in the ORG1 and reference treatments during both rotations.

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Experiments on nitrogen fixation by nodulated lucerne

Cited by 33 publications

References 20 publications

Evaluation of the symbiotic nitrogen-fixing potential of soils by direct microbiological means

Evaluation of the symbiotic nitrogen-fixing potential of soils by direct microbiological means

Selection for dinitrogen-fixing ability in Phaseolus vulgaris L. at two low-temperature regimes

Nitrogen and Phosphorus Losses with Drainage Runoff and Field Balance as a Result of Crop Management

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