| Optimising biological N2 fixation by legumes in farming systems G Hardarson, C Atkins Plant and soil 252, 41-54, 2003 | 278 | 2003 |
| Time Course of Nitrogen Fixation in Field‐Grown Soybean Using Nitrogen‐15 Methodology1 F Zapata, SKA Danso, G Hardarson, M Fried Agronomy Journal 79 (1), 172-176, 1987 | 277 | 1987 |
| Methods for enhancing symbiotic nitrogen fixation G Hardarson Enhancement of Biological Nitrogen Fixation of Common Bean in Latin America …, 1993 | 268 | 1993 |
| Effect of plant genotype and nitrogen fertilizer on symbiotic nitrogen fixation by soybean cultivars G Hardarson, F Zapata, SKA Danso Plant and soil 82, 397-405, 1984 | 207 | 1984 |
| Misconceptions and practical problems in the use of 15N soil enrichment techniques for estimating N2 fixation SKA Danso, G Hardarson, F Zapata Enhancement of Biological Nitrogen Fixation of Common Bean in Latin America …, 1993 | 192 | 1993 |
| Genotypic variation in biological nitrogen fixation by common bean G Hardarson, FA Bliss, MR Cigales-Rivero, RA Henson, JA Kipe-Nolt, ... Enhancement of Biological Nitrogen Fixation of Common Bean in Latin America …, 1993 | 191 | 1993 |
| Biological nitrogen fixation in maize (Zea mays L.) by 15N isotope-dilution and identification of associated culturable diazotrophs A Montañez, C Abreu, PR Gill, G Hardarson, M Sicardi Biology and fertility of soils 45, 253-263, 2009 | 169 | 2009 |
| Nitrogen fixation in fababeans as affected by plant population density in sole or intercropped systems with barley SKA Danso, F Zapata, G Hardarson, M Fried Soil Biology and Biochemistry 19 (4), 411-415, 1987 | 163 | 1987 |
| Methods for measuring biological nitrogen fixation in grain legumes G Hardarson, SKA Danso Plant and soil 152, 19-23, 1993 | 149 | 1993 |
| Estimation of residual N effect of faba bean and pea on two succeeding cereals using15N methodology R Senaratne, G Hardarson Plant and Soil 110, 81-89, 1988 | 147 | 1988 |
| Dinitrogen Fixation Measurements in Alfalfa‐Ryegrass Swards Using Nitrogen‐15 and Influence of the Reference Crop G Hardarson, F Zapata, SKA Danso Crop Science 28 (1), 101-105, 1988 | 138 | 1988 |
| Effects of delayed soil and foliar N fertilization on yield and N2 fixation of soybean R Afza, G Hardarson, F Zapata, SKA Danso Plant and Soil 97, 361-368, 1987 | 134 | 1987 |
| Nitrogen Fixation and Translocation in Field‐Grown Fababean1 F Zapata, F Danso, G Hardarson, M Fried Agronomy Journal 79 (3), 505-509, 1987 | 125 | 1987 |
| Nitrogen fixation in soybean (Glycine max L. Merrill) as affected by nodulation patterns G Hardarson, M Golbs, SKA Danso Soil Biology and Biochemistry 21 (6), 783-787, 1989 | 117 | 1989 |
| Measurements of nitrogen fixation in fababean at different N fertilizer rates using the 15N isotope dilution and ‘A-value’ methods G Hardarson, SKA Danso, F Zapata, K Reichardt Plant and soil 131, 161-168, 1991 | 110 | 1991 |
| Variation within and between white clover varieties in their preference for strains of Rhizobium trifolii DG Jones, G Hardarson Annals of applied biology 92 (2), 221-228, 1979 | 92 | 1979 |
| Influence of Bradyrhizobium japonicum Location and Movement on Nodulation and Nitrogen Fixation in Soybeans P Wadisirisuk, SKA Danso, G Hardarson, GD Bowen Applied and environmental microbiology 55 (7), 1711-1716, 1989 | 89 | 1989 |
| A comparison of direct and indirect 15N isotope techniques for estimating crop N uptake from organic residues RC Hood, K N'goran, M Aigner, G Hardarson Plant and Soil 208 (2), 259-270, 1999 | 78 | 1999 |
| Use of 15N methodology to assess biological nitrogen fixation G Hardarson, SKA Danso | 73 | 1990 |
| Yield, nodulation, and N2 fixation by cowpea cultivars at different phosphorus levels AB Ankomah, F Zapata, G Hardarson, SKA Danso Biology and fertility of soils 22, 10-15, 1996 | 72 | 1996 |
