106 research outputs found
Correction to: Reducing external costs of nitrogen pollution by relocation of pig production between regions in the European Union
No full textThe article Reducing external costs of nitrogen pollution by relocation of pig production between regions in the European Union, written by Hans J. M. van Grinsven, Jan D. van Dam, Jan Peter Lesschen, Marloes H. G. Timmers, Gerard L. Velthof, Luis Lassaletta, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 28 May 2018 without open access. With the author(s)’ decision to opt for Open Choice the copyright of the article changed on April 2019
Nutrient flows and balances at the field and farm scale: Exploring effects of land-use strategies and access to resources
No full textSmallholders' soil fertility management in the Central Highlands of Ethiopia: implications for nutrient stocks, balances and sustainability of agroecosystems
No full textLow agricultural productivity caused by soil degradation is a serious problem in the Ethiopian Highlands. Here, we report how differences in soil fertility management between farming systems, based either on enset (Ensete ventricosum) or on teff (Eragrostis tef) as the major crops, affect the extent of nutrient stocks, balances and ecosystem sustainability. We collected information on farmers' resources and nutrient management practices from stratified randomly selected households in two watersheds in the Central Highlands of Ethiopia. In addition, we collected soil samples from each land use and calculated nutrient stocks, partial and full nutrient balances (N, P and K) for one cropping season. Our results show that farmers in the two farming systems manage their soils differently and that nutrient inputs were positively related to farmers' wealth status. The watershed with the enset-based system had higher soil N and K stocks than the watershed with the teff-based system, while P stocks were not different. Management related N and K fluxes were more negative in the teff-based system (-28 kg N ha-1 yr-1 and -34 kg K ha-1 yr-1) than in the enset-based system (-6 kg N ha-1 yr-1 and -14 kg K ha-1 yr-1) while P fluxes were almost neutral or slightly positive. Within the enset-based system, a strong redistribution of N, P and K took place from the meadows and cereals (negative balance) to enset (positive balances). Although in the teff-based system, N, P and K were redistributed from meadows, small cereals and pulses to maize, the latter still showed a negative nutrient balance. In contrast to nutrient balances at land use level, nutrient balances at the watershed scale masked contrasting areas within the system where nutrient oversupply and deficiencies occurred
Assessment of soil nutrient depletion and its spatial variability on smallholders' mixed farming systems in Ethiopia using partial versus full nutrient balances
No full textSoil fertility depletion in smallholder farms is one of the fundamental biophysical causes for declining per capita food production in Ethiopia. In the present study, we assess soil nutrient depletion and its spatial variability for Ethiopia and its regional states, using nutrient balances as a tool. Data on crop production, fertilizer use and land management practices were collected from the Agricultural sample survey, which was carried out by the Central Statistics Authority (CSA) for the production year 1999/2000. We used a Geographic Information System (GIS) to process, and analyze spatially referenced information like soil properties, precipitation and land use types. We calculated nutrient balances for N, P and K from five nutrient fluxes entering and five nutrient fluxes leaving cultivated lands of smallholders. Some of the fluxes (e.g. leaching, denitrification and wet deposition) were estimated using transfer functions. Erosion was estimated by universal soil loss equation (USLE) and landscape process modelling at multi-dimensions and scales (LAPSUS). At the national level, full nutrient balance results indicate a depletion rate of 122 kg N ha-1 yr-1, 13 kg P ha-1 yr-1 and 82 kg K ha-1 yr-1. Soil nutrient stocks in all regional states were decreasing with the exception of areas under permanent and vegetable crops. In the analysis, soil erosion was the major cause for nutrients depletion, but this flux shows significant variability between different estimates and was highly uncertain. We calculated that the contribution of erosion to N losses was 70%, while its contribution to P and K losses were 80% and 63%, respectively. Nutrient losses under permanent and vegetable cropping were caused mainly by residues removal, harvested products and leaching, while losses under cereals and other annuals were dominated by erosion
Verkenning naar ruimtegebruik landbouw 2050 voor Regio Amersfoort : Regionale ruimtelijke uitwerking van WUR-scenariostudie Landbouw in Nederland in 2050 voor Regio Amersfoort
No full textIn deze studie zijn vier scenario’s uit de landelijke WUR-studie ‘Scenariostudie perspectief voor ontwikkelrichtingen Nederlandse landbouw in 2050’ (Lesschen et al., 2020) vertaald naar effecten op grondgebruik en veestapel in Regio Amersfoort. In deze regio is de gronddruk al hoog en vanuit verschillende hoeken worden er in de toekomst meer claims gelegd op het agrarische landelijk gebied. De agrarische sector zelf werkt echter ook aan de transitie van het voedselsysteem en aan de hand van de vier scenario’s wordt inzichtelijk gemaakt hoe het toekomstige ruimtegebruik voor de landbouw in Regio Amersfoort eruit kan zien gegeven de opgaven waar de landbouw op dit moment voor staat.De resultaten laten zien dat de transitie van de landbouw ook veel ruimte vergt en dat de behoefte aan grond voor deze sector in de toekomst ook groot blijft
Verkenning naar ruimtegebruik landbouw 2050 voor Regio Foodvalley : regionale ruimtelijke uitwerking van WUR-scenariostudie Landbouw in Nederland in 2050
No full textIn deze studie zijn vier scenario’s uit de landelijke WUR-studie ‘Scenariostudie perspectief voor ontwikkelrichtingen Nederlandse landbouw in 2050’ (Lesschen et al., 2020) vertaald naar effecten op grondgebruik en veestapel in Regio Foodvalley. In deze regio is de gronddruk al hoog en vanuit verschillende hoeken worden er in de toekomst meer claims gelegd op het agrarische landelijk gebied. De agrarische sector zelf werkt echter ook aan de transitie van het voedselsysteem en aan de hand van de vier scenario’s wordt inzichtelijk gemaakt hoe het toekomstige ruimtegebruik voor de landbouw in Regio Foodvalley eruit kan zien gegeven de opgaven waar de landbouw op dit moment voor staat.De resultaten laten zien dat voor de transitie van de landbouw ook veel ruimte vergt en dat de behoefte aan grond voor deze sector in de toekomst ook groot blijft
Harvesting and managing reed for sustainable bio-energy production in Ukraine
No full textWolter Elbersen, Theo van der Sluis, Jan Peter Lesschen, Maksym Kulyk, Oleksii Rii, Nataliya Shokalo, Ronald Poppens, Petro Kraisvitnii, Loic Lerminiaux. Harvesting and managing reed for
sustainable bio-energy production in Ukraine. Reed aa renewable resource, Greifswald, Germany, 14-16 February 2013
Harvesting and managing reed for sustainable bio-energy production in Ukraine
No full textWolter Elbersen, Theo van der Sluis, Jan Peter Lesschen, Maksym Kulyk, Oleksii Rii, Nataliya Shokalo, Ronald Poppens, Petro Kraisvitnii, Loic Lerminiaux. Harvesting and managing reed for
sustainable bio-energy production in Ukraine. Reed aa renewable resource, Greifswald, Germany, 14-16 February 2013
Klimaatmaatregelen en het gemeentelijk landbouwbeleid : verkenning naar mogelijkheden voor versterking van klimaatmaatregelen binnen het toekomstig GLB in Nederland
No full textOptions to improve the nitrogen use efficiency in the Dutch agriculture sector
No full textThe aim of this study is to quantify the N flows and nitrogen use efficiency (NUE) in Dutch agriculture and to assess options to improve this efficiency. Improvement options related to i) reduced mineral N fertilizer use, ii) reduced feed import and iii) reduced N emissions were identified and their impact was estimated for 2030 and 2040. Current NUE of the crop system is 58%, whereas in the NUE of the livestock system 30%. The results show that the improvement options could lead to N saving of 97 kton by 2030 and up to 209 kton N by 2040. This would increase the NUE of Dutch agriculture from 40% in 2020 to 52% in 2040. Most of the N savings can be obtained by measures that reduce the mineral N fertilizer use, of which the use of clover in grassland is the main option. These findings show that there is still large scope for improvement in NUE in Dutch agriculture, which will reduce the N emissions to the environment and improve nutrient cycling
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