By Gudni Hardarson (auth.), F. A. Bliss, G. Hardarson (eds.)

The universal bean (Phaseolus vulgaris L.) is crucial pulse crop in Latin the United States, in addition to in huge elements of Asia and Africa. it truly is really very important as a result of its skill, in symbiosis with Rhizobium micro organism, to mend atmospheric nitrogen and because of its excessive nutrient value.
Incorporating contributions from plant breeders, microbiologists, plant physiologists and soil scientists, this quantity reviews the result of an FAO/IAEA Coordinated examine Programme (1985--1991), whose major aim used to be to reinforce yield and organic nitrogen fixation in universal bean through lowering its reliance on soil and fertilizer nitrogen.
the amount might be useful to scientists engaged on organic nitrogen fixation and legume production.

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Extra info for Enhancement of Biological Nitrogen Fixation of Common Bean in Latin America: Results from an FAO/IAEA Co-ordinated Research Programme, 1986–1991

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This approach has been used by Boller (1988) to show that perennial ryegrass grown in mixture with white clover took up more N late in a growth cycle than in monoculture during the seeding year, and there was no consistent pattern between mixed vs monoculture Italian ryegrass. Even if it is established conclusively that fixed N 2 is transferred from a fixing to a reference crop, it is necessary to ascertain when this has a significant influence on estimates of N 2 fixed. The use of this reference crop becomes a serious problem mainly when the level of N 2 fixation is low.

Plant and Soil 152: 25-52, 1993. © 1993 Kluwer Academic Publishers. A. DANS0 , G. HARDARSON and F. O. Box 100, A-1400 Vienna, Austria; zSoil Science Unit, Joint FAO/IAEA Programme, Agency's Laboratories, A-2444 Seibersdorf, Austria Key words: A-value method, legumes, ION isotope dilution, nitrogen fixation, Rhizobium Abstract The 15N methods are potentially accurate for measuring N z fixation in plants. The only problem with those methods is, how to ensure that the 15N / 14N ratio in the plant accurately reflects the integrated 15N / 14N ratio (R) in soil which is variable in time and with soil depth.

Experimental verification of this has been provided by Ledgard et al. (1985c) who observed that ryegrass was a suitable reference for clover, even though ryegrass assimilated N from greater depths than clover. Furthermore, Ledgard et al. (1985c) reported that root activity and indigenous plantavailable soil N were small in the 10-40 cm zone, relative to the 0-10 cm zone. The greater activity of ryegrass roots at depth therefore had no significant effect on R or the determination of N 2 fixed by clover.

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