Nitrogen fixation of lucerne (Medicago sativa) in an acid soil: The use of rhizotrons as a model system to simulate field conditions

Symbiotic nitrogen fixation with 49 isolates of Rhizobium meliloti was studied under controlled environment with alfalfa cv. Saranac. It was shown that plant yield in dry weight can be used as an indirect measurement of nitrogen fixation, and as a criterion for selecting efficient strains of R. meliloti. Statistical study on yields of three cuttings has established that the second cutting gives the most necessary information to correctly evaluate the symbiotic efficiency of the isolates. Six very efficient strains were selected.

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Nitrogen fixation (15N dilution) with soybeans under Thai field conditions

Plant and Soil ◽

10.1007/bf02370103 ◽

1988 ◽

Vol 108 (1) ◽

pp. 87-92 ◽

Cited By ~ 25

Author(s):

R. M. N. Kucey ◽

P. Chaiwanakupt ◽

T. Arayangkool ◽

P. Snitwongse ◽

C. Siripaibool ◽

...

Keyword(s):

Nitrogen Fixation ◽

Field Conditions ◽

15N Dilution

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Assessment of Nitrogen Fixation in Terrestrial Environments in Field Conditions

Nature ◽

10.1038/227378a0 ◽

1970 ◽

Vol 227 (5256) ◽

pp. 378-379 ◽

Cited By ~ 10

Author(s):

W. S. SILVER ◽

TIMOTHY MAGUE

Keyword(s):

Nitrogen Fixation ◽

Field Conditions ◽

Terrestrial Environments

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RHIZOBIAL INOCULATION AND P FERTILIZATION RESPONSE IN COMMON BEAN (PHASEOLUS VULGARIS) UNDER GLASSHOUSE AND FIELD CONDITIONS

Experimental Agriculture ◽

10.1017/s0014479706004236 ◽

2007 ◽

Vol 43 (1) ◽

pp. 67-77 ◽

Cited By ~ 13

Author(s):

M. ZAMAN-ALLAH ◽

B. SIFI ◽

B. L'TAIEF ◽

M. H. EL AOUNI ◽

J. J. DREVON

Keyword(s):

Nitrogen Fixation ◽

Phaseolus Vulgaris ◽

Common Bean ◽

Symbiotic Nitrogen Fixation ◽

Field Conditions ◽

Nutrient Deficiencies ◽

P Fertilization ◽

Rhizobium Tropici ◽

Symbiotic Efficiency ◽

Rhizobial Inoculation

Osmotic constraints, nutrient deficiencies, especially phosphorus, and the lack of efficient strains of rhizobia in Mediterranean soils are major factors limiting symbiotic nitrogen fixation and yield in common bean (Phaseolus vulgaris). In order to improve yields, we investigated responses to rhizobial inoculation and P fertilization under glasshouse and field conditions with two bean cultivars, Coco blanc and BAT477. The nodulation test, using a hydroponic system in a glasshouse, revealed strong variability among 22 rhizobium strains of various origins, in their symbiotic efficiency, compared with Rhizobium tropici CIAT899. The introduced strains proved to be more efficient although some local rhizobia revealed high potential efficiencies. Glasshouse trials showed a significant effect of inoculation and P supply on nodulation, N content and shoot dry weight that varied with rhizobial strain. Field trials substantiated the glasshouse observations and emphasized the effects of cultivar-rhizobia interactions on symbiotic parameters and yields. It is concluded that inoculation with suitable rhizobia with supply of additional P is a technology that may improve symbiotic nitrogen fixation and yield in common bean in some soils under a Mediterranean climate.

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EFFECT OF SEA CROP 16 AND ERGOSTIM ON CROP YIELDS AND PLANT COMPOSITION

Canadian Journal of Soil Science ◽

10.4141/cjss82-057 ◽

1982 ◽

Vol 62 (3) ◽

pp. 527-532 ◽

Cited By ~ 9

Author(s):

UMESH C. GUPTA ◽

J. A. MacLEOD

Keyword(s):

Triticum Aestivum ◽

Pisum Sativum ◽

Medicago Sativa ◽

Crop Yields ◽

Triticum Aestivum L ◽

Field Conditions ◽

Plant Composition ◽

Greenhouse Study ◽

Pisum Sativum L ◽

Medicago Sativa L

Experiments were conducted to determine the effect of Sea Crop (SC 16) and Ergostim on the yield and nutrient composition of a few crops. Studies conducted under greenhouse and field conditions showed that the yields of wheat (Triticum aestivum L.) and peas (Pisum sativum L.) were not affected by the addition of SC16. The nitrogen (N) and sulfur (S) concentrations of the two crops were not affected by SC 16, except in the control and SC 16 treatment only where the increases were likely due to a concentration effect, since these two treatments had lower yields. Boron (B) and molybdenum (Mo) concentrations in the plants were significantly affected by B and Mo applications, but not by SC 16. A greenhouse study showed that the yields of alfalfa (Medicago sativa L.) and wheat were not affected by the addition of Ergostim. The addition of Ergostim did not affect the N or S concentration of wheat or three cuts of alfalfa.

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