A soil-based screening method was used to test tolerance of wheat genotypes to acidity. Plants were grown for 6 days in an acid soil with the pH adjusted to 3.9\uffe2\uff80\uff935.8. The number and length of roots were measured. To validate the method, 12 wheat cultivars of known acidity tolerance and one acid-sensitive barley cultivar were grown on an acid soil in the field with or without amelioration of subsoil acidity. The relative yields of these wheat genotypes on the soil with subsoil acidity ranged from 50 to 89% of yields on soil without subsoil acidity, and were correlated with root growth parameters obtained in the glasshouse. The best correlation was obtained between relative yields in the field (y) and root length per plant (x) at pH 3.9 in the glasshouse (y = \uffe2\uff80\uff9343 + 52*log x, r = 0.95) or root length per plant at pH 3.9 as a percentage of root length at pH 4.8 (y = 1.2 + 46*log x, r = 0.94). Following validation of the glasshouse screening method in the field, 115 wheat genotypes, including cultivars and breeding lines, were screened in the glasshouse. A substantial genotypic variation in acidity tolerance was found, with root length per plant at pH 3.9 ranging from 66 to > 350 mm. Many Western Australian breeding lines displayed better tolerance than existing tolerant wheat cultivars. The screening system can be instrumental in breeding wheat for increased tolerance to acid soils.
", "keywords": ["0106 biological sciences", "2. Zero hunger", "070306 Crop and Pasture Nutrition", "0703 (four-digit-FOR)", "0401 agriculture", " forestry", " and fisheries", "300103 Soil Chemistry", "04 agricultural and veterinary sciences", "01 natural sciences"], "contacts": [{"organization": "Rengel, Z., Nuruzzaman, M., Tang, Caixian.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1071/ar02116"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Australian%20Journal%20of%20Agricultural%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1071/ar02116", "name": "item", "description": "10.1071/ar02116", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/ar02116"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2003-01-01T00:00:00Z"}}, {"id": "10.2136/sssaj2009.0185", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-05-30T16:21:13Z", "type": "Journal Article", "created": "2010-04-22", "title": "Unweathered Wood Biochar Impact On Nitrous Oxide Emissions From A Bovine-Urine-Amended Pasture Soil", "description": "Low\uffe2\uff80\uff90temperature pyrolysis of biomass produces a product known as biochar The incorporation of this material into the soil has been advocated as a C sequestration method. Biochar also has the potential to influence the soil N cycle by altering nitrification rates and by adsorbing or NH3 Biochar can be incorporated into the soil during renovation of intensively managed pasture soils. These managed pastures are a significant source of N2O, a greenhouse gas, produced in ruminant urine patches. We hypothesized that biochar effects on the N cycle could reduce the soil inorganic\uffe2\uff80\uff90N pool available for N2O\uffe2\uff80\uff90producing mechanisms. A laboratory study was performed to examine the effect of biochar incorporation into soil (20 Mg ha\uffe2\uff88\uff921) on N2O\uffe2\uff80\uff90N and NH3\uffe2\uff80\uff93N fluxes, and inorganic\uffe2\uff80\uff90N transformations, following the application of bovine urine (760 kg N ha\uffe2\uff88\uff921). Treatments included controls (soil only and soil plus biochar), and two urine treatments (soil plus urine and soil plus biochar plus urine). Fluxes of N2O from the biochar plus urine treatment were generally higher than from urine alone during the first 30 d, but after 50 d there was no significant difference (P = 0.11) in terms of cumulative N2O\uffe2\uff80\uff90N emitted as a percentage of the urine N applied during the 53\uffe2\uff80\uff90d period; however, NH3\uffe2\uff80\uff93N fluxes were enhanced by approximately 3% of the N applied in the biochar plus urine treatment compared with the urine\uffe2\uff80\uff90only treatment after 17 d. Soil inorganic\uffe2\uff80\uff90N pools differed between treatments, with higher concentrations in the presence of biochar, indicative of lower rates of nitrification. The inorganic\uffe2\uff80\uff90N pool available for N2O\uffe2\uff80\uff90producing mechanisms was not reduced, however, by adding biochar.
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