Bürkert, Andreas

[["dc.bibliographiccitation.firstpage","942"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Journal of Plant Nutrition and Soil Science"],["dc.bibliographiccitation.lastpage","951"],["dc.bibliographiccitation.volume","174"],["dc.contributor.author","Safi, Zikrullah"],["dc.contributor.author","Predotova, Martina"],["dc.contributor.author","Schlecht, Eva"],["dc.contributor.author","Buerkert, Andreas"],["dc.date.accessioned","2018-11-07T08:49:12Z"],["dc.date.available","2018-11-07T08:49:12Z"],["dc.date.issued","2011"],["dc.description.abstract","Little is known about nutrient fluxes and nutrient-use efficiencies in urban and peri-urban agriculture (UPA) of rapidly expanding cities in developing countries. Therefore, horizontal flows of carbon (C), nitrogen (N), phosphorus (P), and potassium (K) as well as leaching losses of mineral N and P were measured over 2 years in three representative agricultural production systems of Kabul. These comprised 21 gardens and 18 fields dedicated to vegetable farming, cereal farming, and table-grape production (vineyards). Across sites (fields and gardens) biennial inputs averaged 375 kg N ha(-1), 155 kg P ha(-1), 145 kg K ha(-1), and 15 kg C ha(-1) while with harvests 305 kg N ha(-1), 40 kg P ha(-1), 330 kg K ha(-1), and 7 kg C ha(-1) were removed. In vegetable gardens, biennial net balances were 80 kg N ha(-1), 75 kg P ha(-1), 205 kg K ha(-1), and 4 kg C ha(-1), whereas in cereal farming biennial horizontal balances amounted to 155 kg N ha(-1), 20 kg P ha(-1), 355 kg K ha(-1), and 5 kg C ha(-1). In vineyards, corresponding values were 295 kg N ha(-1), 235 kg P ha(-1), 5 kg K ha(-1), and 3 kg C ha(-1). Annual leaching losses in two selected vegetable gardens varied from 70 to 205 kg N ha(-1) and from 5 to 10 kg P ha(-1). Night soil and irrigation water were the major sources among the applied nutrient inputs in all studied farming systems, contributing on average 12% and 25% to total N, 22% and 12% to total P, 41% and 53% to total K, and 79% and 10% to total C, respectively. The results suggest that soils in extensive cereal fields are at risk of N and K depletion and in vegetable gardens of K depletion, while vineyards may be oversupplied with nutrients possibly contributing to groundwater contamination. This merits verification."],["dc.identifier.doi","10.1002/jpln.201000385"],["dc.identifier.isi","000298015400011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21401"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1436-8730"],["dc.title","Horizontal matter fluxes and leaching losses in urban and peri-urban agriculture of Kabul, Afghanistan"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","133"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Agriculture and Rural Development in the Tropics and Subtropics"],["dc.bibliographiccitation.lastpage","143"],["dc.bibliographiccitation.volume","114"],["dc.contributor.author","Rehman, Shoaib Ur"],["dc.contributor.author","Predotova, Martina"],["dc.contributor.author","Khan, Iqar Ahmad"],["dc.contributor.author","Schlecht, Eva"],["dc.contributor.author","Buerkert, Andreas"],["dc.date.accessioned","2019-07-10T08:11:46Z"],["dc.date.available","2019-07-10T08:11:46Z"],["dc.date.issued","2013"],["dc.description.abstract","Faisalabad city is surrounded by agricultural lands, where farmers are growing vegetables, grain crops, and fodder for auto-consumption and local marketing. To study the socioeconomic impact and resource use in these urban and peri-urban agricultural production (UPA) systems, a baseline survey was conducted during 2009–2010. A total of 140 households were selected using a stratified sampling method and interviewed with a structured questionnaire. The results revealed that 96% of the households rely on agriculture as their main occupation. Thirty percent of the households were owners of the land and the rest cultivated either rented or sharecropped land. Most of the families (70 %) were headed by a member with primary education, and only 10%of the household head had a secondary school certificate. Irrigationwater was obtained from waste water (37 %), canals (27 %), and mixed alternative sources (36 %). A total of 35 species were cultivated in the UPA systems of which were 65% vegetables, 15% grain and fodder crops, and 5% medicinal plants. Fifty-nine percent of the households cultivated wheat, mostly for auto-consumption. The 51% of the respondents grew cauliflower (Brassica oleracea L.) and gourds (Cucurbitaceae) in the winter and summer seasons, respectively. Group marketing was uncommon and most of the farmers sold their produce at the farm gate (45 %) and on local markets (43 %). Seeds and fertilizers were available from commission agents and dealers on a credit basis with the obligation to pay by harvested produce. A major problem reported by the UPA farmers of Faisalabad was the scarcity of high quality irrigation water, especially during the hot dry summer months, in addition to lacking adequate quantities of mineral fertilizers and other inputs during sowing time. Half of the respondents estimated their daily income to be less than 1.25 US$ and spent almost half of it on food. Monthly average household income and expenses were 334 and 237 US$, respectively."],["dc.identifier.fs","602055"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10768"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60795"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.relation.orgunit","Fakultät für Agrarwissenschaften"],["dc.rights","CC BY-NC-ND 3.0"],["dc.rights.uri","http://creativecommons.org/licenses/by-nc-nd/3.0"],["dc.subject.ddc","630"],["dc.title","Socio-economic characterization of integrated cropping systems in urban and peri-urban agriculture of Faisalabad, Pakistan"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1136"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Journal of Arid Environments"],["dc.bibliographiccitation.lastpage","1146"],["dc.bibliographiccitation.volume","75"],["dc.contributor.author","Schlecht, E."],["dc.contributor.author","Dickhoefer, U."],["dc.contributor.author","Predotova, Martina"],["dc.contributor.author","Buerkert, Andreas"],["dc.date.accessioned","2018-11-07T08:50:34Z"],["dc.date.available","2018-11-07T08:50:34Z"],["dc.date.issued","2011"],["dc.description.abstract","Goat husbandry in Oman's Hajar Mountains supplies income and manure to farmers. An earlier analysis concluded that it uses purchased feeds inefficiently, but did not value the contribution of mountain pastures to goat nutrition and cropland fertilization. Therefore intake of pasture vegetation, cultivated forages and purchased feeds was determined in goats from three villages in spring and autumn 2005. Faecal excretion was quantified using TiO2 and diet digestibility was calculated from faecal nitrogen (N). Organic matter (OM) intake varied from 71 to 107 g kg(-0.75) d(-1). Pasture vegetation supplied 45-71% of OM intake, and at least 28%, 33% and 42% of phosphorus (P), metabolizable energy (ME) and N intake. While ME intake just covered maintenance and locomotion requirements, N and P intake exceeded the animals' requirements. Therefore faecal concentrations (g kg(-1) OM) of 26-36 g N and 4-8 g P were high, making goat dung a key element of sustainability for the local cropping systems. Since mountain pastures supply nutrients to goats and cropland, their long-term productivity is crucial. Feeding cultivated forages seemingly reduces intake on pasture, but a comprehensive evaluation of nutritional and economic implications of this strategy and possible alternatives is needed. (C) 2011 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [BU1308]"],["dc.identifier.doi","10.1016/j.jaridenv.2011.05.010"],["dc.identifier.isi","000294512200022"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21724"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Academic Press Ltd- Elsevier Science Ltd"],["dc.relation.issn","0140-1963"],["dc.title","The importance of semi-arid natural mountain pastures for feed intake and recycling of nutrients by traditionally managed goats on the Arabian Peninsula"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Field Crops Research"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","115"],["dc.contributor.author","Predotova, Martina"],["dc.contributor.author","Gebauer, Jens"],["dc.contributor.author","Diogo, Rodrigue V. C."],["dc.contributor.author","Schlecht, Eva"],["dc.contributor.author","Buerkert, Andreas"],["dc.date.accessioned","2018-11-07T08:46:49Z"],["dc.date.available","2018-11-07T08:46:49Z"],["dc.date.issued","2010"],["dc.description.abstract","Urban and peri-urban agriculture (UPA) contributes significantly to meet increasing food demands of the rapidly growing urban population in West Africa. The intensive vegetable cultivation in UPA gardens with its high nutrient inputs is often reported to operate at large surpluses of nutrients and presumably high turnover rates of organic matter (OM) and nitrogen (N) losses via emanation and leaching. Many of these claims are lacking solid data which would allow suggesting mitigation strategies. Therefore, this study aimed at quantifying gaseous emissions of ammonia (NH(3)), nitrous oxide (N(2)O), and carbon dioxide (CO(2)) in three representative urban gardens of Niamey, Niger using a closed chamber gas monitoring system. Mean annual N emissions (NH(3)-N and N(2)O-N) in two gardens using river water for irrigation reached 53 and 48 kg N ha(-1) yr(-1), respectively, while 25 and 20 Mg C ha(-1) yr(-1) was lost as CO(2)-C. In the garden irrigated with sewage water from the city's main wadi, N(2)O was the main contributorto N losses (68%) which together with NH(3) reached 92 kg N ha(-1) yr(-1), while CO(2)-C emissions amounted to 26 Mg ha(-1) yr(-1). Our data indicate that 28% of the total gaseous C emissions and 30-40% of the N emissions occur during the hot dry season from March to May and another 20-25% and 10-20% during the early rainy season from June to July. Especially during these periods more effective nutrient management strategies in UPA vegetable gardens should be applied to increase the nutrient use efficiency in UPA vegetable gardens. (C) 2009 Elsevier B.V. All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG)"],["dc.identifier.doi","10.1016/j.fcr.2009.09.010"],["dc.identifier.isi","000272584600001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20788"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.relation.issn","0378-4290"],["dc.title","Emissions of ammonia, nitrous oxide and carbon dioxide from urban gardens in Niamey, Niger"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","103"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nutrient Cycling in Agroecosystems"],["dc.bibliographiccitation.lastpage","114"],["dc.bibliographiccitation.volume","87"],["dc.contributor.author","Predotova, Martina"],["dc.contributor.author","Schlecht, Eva"],["dc.contributor.author","Buerkert, Andreas"],["dc.date.accessioned","2018-11-07T08:43:45Z"],["dc.date.available","2018-11-07T08:43:45Z"],["dc.date.issued","2010"],["dc.description.abstract","Intensive vegetable production in urban and peri-urban agriculture (UPA) of West African cities is characterized by high nutrient inputs. However, little is known about nitrogen (N) and carbon (C) losses in these systems, in particular during the storage of manure, the main organic fertilizer in these systems. We therefore aimed at quantifying gaseous emissions of ammonia (NH(3)), nitrous oxide (N(2)O), carbon dioxide (CO(2)) and methane (CH(4)) as well as leaching losses of C, N, phosphorus (P) and potassium (K) from animal manure stored in vegetable gardens of Niamey, Niger. During a first 3.5-month experiment in the hot dry season, cumulative gaseous N losses, measured with a closed-chamber system, were with 0.11 g kg(-1) manure DM highest (P < 0.05) in the uncovered control treatment accounting for 1.8% of total manure N. Nitrogen losses decreased by 72% under plastic sheet roofing and by 50% under roofing + ground rock phosphate (RP) application at 333 g kg(-1) manure DM. Carbon losses from manure amounted to 73 g kg(-1) DM in the control and to 92 g kg(-1) DM and 68 g kg(-1) DM under roofing and under roofing + RP, respectively. In a second 3.5-month experiment conducted in the rainy season, C losses from the control were 164 g kg(-1) manure DM and reduced to 77 and 65% of the control by roofing and roofing + RP, respectively. Leaching losses during the rainy season were only observed for the unroofed control and averaged 2.1 g C, 0.05 g N, 0.07 g P and 1.8 g K kg(-1) manure DM."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG)"],["dc.identifier.doi","10.1007/s10705-009-9316-1"],["dc.identifier.isi","000278120400009"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4255"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20048"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1385-1314"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Nitrogen and carbon losses from dung storage in urban gardens of Niamey, Niger"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]