The chemical properties of the soil at depths of 0-5, 5-10, 10-20, 20-30 and 30-50 cm at two field sites with established macadamia trees were monitored for 5 years following the surface application of various rates of lime (0-1200 g/m2). The effects of annual applications of N and N plus lime were also studied at one site. Both sites received >I700 mm annual rainfall and had strongly acidic, sandy soils. A residual effect of increased pH in the surface soil (0-5 cm depth) was evident after 5 years for lime rates 2200 g/m2. Differences in the nature of the residual effect at each site are discussed in relation to soil acidification, lime dissolution and leaching. High lime rates (>300 g/m2) applied to the soil surface increased pH and reduced extractable A1 in the 10-20 cm depth interval after 12 months. Three years after application, the soil pH at depths of 20-30 and 30-50 cm had been significantly (P < 0.05) increased by surface applications of 600 and 1200 g lime/m2, respectively. The results of this study show that surface application of lime at economic rates (300 to 600 g/m2) can reduce subsoil acidity in coarse-textured soils in high rainfall areas.
", "keywords": ["reclamation", "of lands (Melioration)", "Improvement", "0401 agriculture", " forestry", " and fisheries", "Soil chemistry", "irrigation etc.", "04 agricultural and veterinary sciences", "15. Life on land", "Soil conservation and protection", "6. Clean water", "fertilisation"], "contacts": [{"organization": "Aitken, R.L., Stephenson, R.A., Moody, P.W., Gallagher, E.C.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1071/ar9960109"}, {"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/ar9960109", "name": "item", "description": "10.1071/ar9960109", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/ar9960109"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1996-01-01T00:00:00Z"}}, {"id": "10.1071/ea9950903", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:18:05Z", "type": "Journal Article", "created": "2005-03-31", "title": "Sustaining Productivity Of A Vertisol At Warra, Queensland, With Fertilisers, No-Tillage, Or Legumes .1. Organic Matter Status", "description": "Management practices involving legume leys, grain legumes, and no-tillage and stubble retention, along with nitrogen (N) fertiliser application for wheat cropping, were examined for their effectiveness in increasing soil organic matter (0-10 cm depth) from 1986 to 1993 in a field experiment on a Vertisol at Warra, Queensland. The treatments were (i) grass + legume leys (purple pigeon grass, Setaria incrassata; Rhodes grass, Chloris gayana; lucerne, Medicago sativa; annual medics, M. scutellata and M. truncatula) of 4 years duration followed by continuous wheat; (ii) 2-year rotation of annual medics and wheat (Triticum aestivum cv. Hartog); (iii) 2-year rotation of lucerne and wheat; (iv) 2-year rotation of chickpea (Cicer arietinum cv. Barwon) and wheat; (v) no-tillage (NT) wheat; and (vi) conventional tillage (CT) wheat. Fertiliser N as urea was applied to both NT wheat and CT wheat at 0,25, and 75 kg N/ha. year. The CT wheat also received N at 12.5 and 25kg N/ha. year. After 4 years, soil organic carbon (C) concentration under grass + legume leys increased by 20% (650 kg C/ha. year) relative to that under continuous CT wheat. Soil total N increased by 11, 18, and 22% after 2, 3, and 4 years, respectively, under grass + legume leys relative to continuous CT wheat. These increases in soil organic matter were mostly confined to the 0-2.5 cm layer. After the start of wheat cropping, organic C and total N levels declined steadily but were still higher than under CT wheat and higher than initial values in December 1985. Although 2-year rotations of lucerne-wheat and medic-wheat had a small effect on soil organic C, soil total N concentrations were higher than in the chickpea-wheat rotation and continuous CT wheat from November 1990 to November 1992. Soil under chickpea-wheat rotation had organic C and total N concentrations similar to continuous CT wheat, although from the former, about 70 kg/ha. year of extra N was removed in the grain from 1989 to 1993. No-tillage practice had a small effect on soil organic C, although total N concentration was higher than under CT wheat in November 1993. These effects were mainly confined to the surface 0-2.5 cm depth. The C to N ratio was only affected in soil under grass + legume leys, and no-tillage treatments. These data show that restoration of soil organic matter in Vertisol requires grass + legume leys, primarily due to increased root biomass, although soil total N can be enhanced by including legume leys for longer duration in cropping systems in the semi-arid and subtropical environment.
", "keywords": ["2. Zero hunger", "1100 Agricultural and Biological Sciences", "Soil and crops. Soil-plant relationships. Soil productivity", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "Soil conservation and protection", "6. Clean water", "12. Responsible consumption"]}, "links": [{"href": "https://doi.org/10.1071/ea9950903"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Australian%20Journal%20of%20Experimental%20Agriculture", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1071/ea9950903", "name": "item", "description": "10.1071/ea9950903", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/ea9950903"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1995-01-01T00:00:00Z"}}, {"id": "10.1071/sr9860265", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:18:08Z", "type": "Journal Article", "created": "2005-04-06", "title": "Long-Term Trends In Fertility Of Soils Under Continuous Cultivation And Cereal Cropping In Southern Queensland .1. Overall Changes In Soil Properties And Trends In Winter Cereal Yields", "description": "Changes in fertility of some southern Queensland soils resulting from extended periods of cultivation are presented, together with trends in yields of winter cereals on these soils. Six major soils of the cereal-belt, cropped for maximum periods of 20-70 years were examined. These were: Black earths, Waco soil; grey, brown and red clays (brigalow), Langlands-Logie soil; grey, brown and red clays (poplar box), Cecilvale soil; grey, brown and red clays (belah), Billa Billa soil; grey, brown and red clays (coolibah), Thallon soil; red earths, Riverview soil. Organic matter and its constituents, especially total organic C, organic C in the light fraction, total N and mineralizable N, were affected most by cultivation, showing decreases of 19-67% overall. Other soil properties probably associated with organic matter, including bulk density and DTPA (diethylenetriaminepentaacetic acid) extractable manganese, were also significantly affected by cultivation in all soils. Soil properties affected least by cultivation were concentrations of inorganic phosphorus, total and exchangeable potassium, calcium carbonate, and dithionite extractable iron and aluminium. Most other soil properties studied (organic P, total sulfur, pH, exchangeable magnesium and sodium, exchangeable sodium percentage, and oxalate-extractable iron and aluminium) were affected by cultivation in at least four soils. Four factors accounted for 70% of the total variation among the 45 soil properties considered. They appeared to represent organic matter, clay colloids, iron and aluminium oxides, and soluble salts. Dry matter yield and/or N uptake of winter cereal crops (wheat and barley) measured in 1983 showed significant decreasing trends with period of cultivation in all soils.
", "keywords": ["2. Zero hunger", "Soil and crops. Soil-plant relationships. Soil productivity", "2304 Environmental Chemistry", "Wheat", "Methods and systems of culture. Cropping systems", "0401 agriculture", " forestry", " and fisheries", "Queensland", "04 agricultural and veterinary sciences", "15. Life on land", "Soil conservation and protection", "1111 Soil Science"]}, "links": [{"href": "https://doi.org/10.1071/sr9860265"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1071/sr9860265", "name": "item", "description": "10.1071/sr9860265", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/sr9860265"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1986-01-01T00:00:00Z"}}, {"id": "10.1071/sr14236", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:18:08Z", "type": "Journal Article", "created": "2015-09-11", "title": "Managing Cattle Grazing Intensity: Effects On Soil Organic Matter And Soil Nitrogen", "description": "Extensive cattle grazing is the dominant land use in northern Australia. It has been suggested that grazing intensity and rainfall have profound effects on the dynamics of soil nutrients in northern Australia\uffe2\uff80\uff99s semi-arid rangelands. Previous studies have found positive, neutral and negative effects of grazing pressure on soil nutrients. These inconsistencies could be due to short-term experiments that do not capture the slow dynamics of some soil nutrients and the effects of interannual variability in rainfall. In a long-term cattle grazing trial in northern Australia on Brown Sodosol\uffe2\uff80\uff93Yellow Kandosol complex, we analysed soil organic matter and mineral nitrogen in surface soils (0\uffe2\uff80\uff9310\uffe2\uff80\uff89cm depth) 11, 12 and 16 years after trial establishment on experimental plots representing moderate stocking (stocked at the long-term carrying capacity for the region) and heavy stocking (stocked at twice the long-term carrying capacity). Higher soil organic matter was found under heavy stocking, although grazing treatment had little effect on mineral and total soil nitrogen. Interannual variability had a large effect on soil mineral nitrogen, but not on soil organic matter, suggesting that soil nitrogen levels observed in this soil complex may be affected by other indirect pathways, such as climate. The effect of interannual variability in rainfall and the effects of other soil types need to be explored further.
", "keywords": ["2. Zero hunger", "Soil and crops. Soil-plant relationships. Soil productivity", "13. Climate action", "0401 agriculture", " forestry", " and fisheries", "Cattle", "04 agricultural and veterinary sciences", "15. Life on land", "Soil conservation and protection", "Rangelands. Range management. Grazing"]}, "links": [{"href": "https://doi.org/10.1071/sr14236"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1071/sr14236", "name": "item", "description": "10.1071/sr14236", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/sr14236"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2015-01-01T00:00:00Z"}}, {"id": "10.2136/sssaj2004.2820", "type": "Feature", "geometry": null, "properties": {"updated": "2026-07-25T16:20:22Z", "type": "Journal Article", "created": "2014-01-16", "title": "Soil Carbon Pools In Adjacent Natural And Plantation Forests Of Subtropical Australia", "description": "Soil C dynamics are not only important to both productivity and sustainability of terrestrial ecosystems, but also contribute significantly to global C cycling. Adjacent natural forest (NF), and first (1R) and second rotation (2R) hoop pine (Araucaria cunninghamii Aiton ex A. Cunn.) plantations in southeast Queensland, Australia, were selected to investigate the effects of conversion of NF to hoop pine plantations and forest management (harvesting and site preparation of plantation) on the size and the nature of C pools in surface (0\uffe2\uff80\uff9310 cm) soils using chemical extraction, laboratory incubation and 13C cross\uffe2\uff80\uff90polarization with magic\uffe2\uff80\uff90angle\uffe2\uff80\uff90spinning nuclear magnetic resonance spectroscopy (13C CPMAS NMR). Conversion from NF to hoop pine plantations not only led to the reduction of soil total C (by 19.8%), water\uffe2\uff80\uff90soluble organic C (WSOC) (by 17.7%), CaCl2\uffe2\uff80\uff93extractable organic C (by 38.8%), and hot water\uffe2\uff80\uff90extractable organic C (HWEOC) (by 30.9%) and bioavailability of soil C (as determined by CO2 evolved in the incubation), but also to a change in chemical composition of soil C with lower O\uffe2\uff80\uff90alkyl C and higher alkyl C under the 1R plantation compared with NF. Harvesting and site preparation did not significantly affect total soil C and most labile C pools (except for a decrease in WSOC), but led to a lower signal intensity in the alkyl C spectral region and a decreased alkyl C/O\uffe2\uff80\uff90alkyl C (A/O\uffe2\uff80\uff90A) ratio in the soil under the 2R compared with the 1R plantation. The shifts in the amount and nature of soil C following forest conversion may be attributed to changes in litter inputs, microbial diversity and activity, and the disturbance of soil during harvesting and site preparation.
", "keywords": ["Forestry management", "Agricultural", "570", "04 agricultural and veterinary sciences", "15. Life on land", "Soil conservation and protection", "Environmental sciences", "Research. Experimentation", "Biological sciences", "veterinary and food sciences", "Conservation and protection", "0401 agriculture", " forestry", " and fisheries", "Soils. Soil science", "Queensland"]}, "links": [{"href": "https://doi.org/10.2136/sssaj2004.2820"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Science%20Society%20of%20America%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2136/sssaj2004.2820", "name": "item", "description": "10.2136/sssaj2004.2820", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2136/sssaj2004.2820"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Soil+conservation+and+protection&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Soil+conservation+and+protection&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Soil+conservation+and+protection&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Soil+conservation+and+protection&offset=5", "hreflang": "en-US"}], "numberMatched": 5, "numberReturned": 5, "distributedFeatures": [], "timeStamp": "2026-07-26T00:04:12.187101Z"}