{"type": "FeatureCollection", "features": [{"id": "10.4067/s0718-58392010000200007", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:19:39Z", "type": "Journal Article", "created": "2010-12-27", "description": "Chilean livestock production systems have intensified over the last years, with increasing amounts of N fertilizer inputs creating the potentiality for environmental damage through N pollution of water and air, so that alternative production strategies have been developed to reduce such environmental impacts. This study assesses N losses under different grazing frequencies and intensities on permanent pasture (Lolium perenne L., Festuca arundinacea Schreb., Dactylis glomerata L., and Trifolium repens L.) on an Andisol in Southern Chile. Four grazing strategies were evaluated: frequent-heavy (FH), frequent-light (FL), infrequent-heavy (IH), infrequent-light (IL), and a no grazing control (C) treatment, and each with three replicates in a randomized complete block design. Results of the experiment indicate that N leaching losses were greater in the FH treatment (58.7 kg available N ha -1 ; p < 0.05) and with most of the leaching occurring in spring (39%). On average, N ammonia (NH3) losses were 10% greater in the frequent grazing treatments in relation to the infrequent grazing treatments, since there were no significant differences (P \u2264 0.05) among individual grazing events for FH, FL and IH. Results indicate that grazing frequency affects leaching losses while grazing intensity affects ammonia emissions from the grassland. Grazing with dairy cows in Southern Chile should consider this environmental constraint to ensure sustainable production over time.", "keywords": ["lixiviaci\u00f3n", "04 agricultural and veterinary sciences", "amonio", "pastoreo", "01 natural sciences", "ammonium", "leaching", "nitrate", "0401 agriculture", " forestry", " and fisheries", "grazing", "NH3 volatilization", "volatilizaci\u00f3n de amoniaco", "nitrato", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.4067/s0718-58392010000200007"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Chilean%20journal%20of%20agricultural%20research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.4067/s0718-58392010000200007", "name": "item", "description": "10.4067/s0718-58392010000200007", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.4067/s0718-58392010000200007"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-06-01T00:00:00Z"}}, {"id": "10.4067/s0718-58392013000200012", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-21T16:19:39Z", "type": "Journal Article", "created": "2013-07-18", "title": "Rates Of Urea With Or Without Urease Inhibitor For Topdressing Wheat", "description": "The urease inhibitor NBPT(N-(n-butyl) thiophosphoric triamide) is a management alternative to increase urea efficiency in topdressing because it reduces NH3 volatilization. The objective of this study was to evaluate N recovery and yield performance of wheat ( Triticum  aestivum   L.) \u2018BRS 254\u2019 fertilized with different urea or urea + NBPT rates in topdressing. The experiment was conducted from May to September 2007 in Vicosa, Minas Gerais, Brazil. Treatments followed a 5 \u00d7 2 + 1 factorial design consisting of five N fertilizer rates (30, 60, 90, 120, and 150 kg ha-1) as urea or urea + NBPT (Agrotain\u00ae ) applied as topdressing and a control without N. The experiment was a randomized complete block design with four replicates. Adding NBPT to urea resulted in better N utilization by wheat plants. The 100 kg N ha-1 topdressing rate provided the best apparent N recovery by wheat plants, whereas 90 kg ha-1 provided the best N use efficiency.", "keywords": ["2. 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