Papers by Hanne Kristensen
This report describes the work done within the project "Input-output relationships for Intensive ... more This report describes the work done within the project "Input-output relationships for Intensive Monitoring sites", EC contract number SG(99) D/10844. The project results are extensively reported in the Technical Report 2000 (De Vries et al., 2001). Input estimates for selected Level II plots are obtained from throughfall measurements corrected for canopy exchange. Output fluxes were obtained using hydrological model output combined with soil concentrations. Leaching fluxes and input estimates provided the balances. Mean yearly interception evaporation ranged from approximately 160 mm for Pine and Oak to approximately 250 mm for Beech and 300 mm for Spruce, reflecting the increasing interception capacity of those tree species. Median transpiration fluxes were rather constant among the tree species and ranged from 325 mm.yr-1 for Pine to 385 mm.yr-1 for Spruce stands. At most plots, the leaching flux of SO 4 is higher than that of NO 3 , despite the generally lower input of S than of N, indicating that SO 4 is still the dominant source of actual soil acidification. The median sulphur budget is close to zero, but at a considerable number of sites, sulphur is released by the soil, indicating that these systems are recovering from previous episodes of high sulphate input. The leaching of N is generally negligible below throughfall inputs of 10 kg.ha-1 .yr-1. There is a significant relationship between N leaching and N deposition but no significant relationship was found with the soil C/N ratio. Nitrogen budgets show that at most sites (90%) the N input is higher then the N leaching. Variations in base cations leaching were significantly related to the S input and the pH and base saturation. The median base cation balance is close to zero, implying a net adsorption and a net release of base cations at approximately 50% of the plots. The Al leaching flux was significantly related to the SO 4 input reflected by the fact that sites with a high Al leaching coincide with sites with a high input of SO 4. The geographic patterns of both elements, however, did not coincide very well since soil base saturation was also significantly related to the Al leaching flux.
Journal of Applied Ecology
The concurrent assessment of agronomic, ecological and environmental variables enables better cho... more The concurrent assessment of agronomic, ecological and environmental variables enables better choice of agroecological service crop termination management /
Frontiers in Plant Science
Crop diversification in spatial and temporal patterns can optimize the synchronization of nutrien... more Crop diversification in spatial and temporal patterns can optimize the synchronization of nutrients plant demand and availability in soils, as plant diversity and soil microbial communities are the main drivers of biogeochemical C and nutrient cycling. The introduction of multi-cropping in organic vegetable production can represent a key strategy to ensure efficient complementation mediated by soil microbiota, including beneficial mycorrhizal fungi. This study shows the effect of the introduction of multi-cropping in five European organic vegetable systems (South-West: Italy; North-West: Denmark and Belgium; North-East: Finland and Latvia) on: (i) soil physicochemical parameters; (ii) soil microbial biomass stoichiometry; (iii) crop root mycorrhization; (iv) bacterial and fungal diversity and composition in crop rhizosphere; (v) relative abundance of selected fungal pathogens species. In each site, three cropping systems were considered: (1) crop 1—monocropping; (2) crop 2—monocropp...
Organic agriculture has an increasing demand, driving conventional farmers to change their busine... more Organic agriculture has an increasing demand, driving conventional farmers to change their businesses 1. In some cases, the lack of attention for biodiversity and soil fertility of current practices may damage the credibility of organic products 2. The SUREVEG project focuses on the implementation of strip-cropping in organic production to improve soil fertility and biodiversity throughout Europe. The aim is to enhance resilience, system sustainability, local nutrient recycling, and soil carbon storage 3. However, husbandry crops grown and mixed in a strip design pose new challenges regarding mechanisation, which in many cases can only be overcome by increasing human tasks 4. To counteract the additional labour of a multi-crop system, one of the main objectives of this project is the development of automated machinery for the management of strip-cropping systems. A robotic tool is proposed, which will be operating upside down, attached to a wide-span mobile carriage similar to gantry systems used in Controlled Traffic Farming. Within the project framework, a modular proof-of-concept version is being produced, combining sensing technologies with actuation in the form of a robotic arm. Despite many robotic developments recently presented, which are designed for weed removal, this proof-of-concept will focus on providing precise organic fertilization. Fertiliser needs will be identified in real-time and carried out on a single-plant scale. Design guidelines of the proposed prototype have been detailed. The planning and control of the manipulator are being developed in two ways: using conventional algorithms and applying machine learning techniques. First results have been also obtained with the sensorics onboard the robotic platform, by using a combination of LiDAR systems and multispectral cameras to localize single plants, and to detect their status, according to fertilisation demands
Soil Use and Management, 2021
SummaryLime and phosphorus (P) applications are common agricultural management practices. Our aim... more SummaryLime and phosphorus (P) applications are common agricultural management practices. Our aim was to quantify the effects of long‐term application practices on root growth and abundance of arbuscular mycorrhizal fungi (AMF) under field conditions. We assessed the effects of lime and P fertilizer applications on barley yield, root growth and AMF abundance in 2016. Treatments were no, low, medium and high liming rate corresponding to application of 0, 4, 8 and 12 Mg lime ha−1 every 5–9 years since 1942 combined with no or yearly application of 15.6 kg P ha−1 since 1944. At harvest, grain yield, root intensity (core‐break) and AMF abundance at different soil depths were estimated. Root development was monitored during early growth with minirhizotrons in treatments receiving low, medium and high liming rates and P fertilization. A quadratic model relating grain yield to liming rate estimated yields to peak at 6.4 Mg lime ha−1 with yields of 4.2 and 3.2 Mg grain ha−1 with and without...
The belowground functional biodiversity indicators to be considered in SUREVEG project to meet th... more The belowground functional biodiversity indicators to be considered in SUREVEG project to meet the Task 3.3. objective are described. They must be applied to verify if and how the strip-cropping (factor 1) and fertility strategies (factor 2) affect the functional biodiversity of belowground organisms groups, being the first factor mandatory and the second one optional. Some brief explanation on how to evaluate the results are reported.
The "Guidelines for indicators of functional biodiversity of belowground organism groups” (D... more The "Guidelines for indicators of functional biodiversity of belowground organism groups” (D3.1) set the mandatory indicators to be used in SUREVEG project - WP3 - Task 3.3.: microbial coefficient (Cmic/TOC), hot water-soluble C and P (HWC and HWP), microbial stoichiometry, crop root mycorrhization (M%), next generation sequencing (NGS). Other optional indicators may be considered to implement information on BFB. The cropping system (SC/MC) is considered the main factor. Only for HWC and HWP indicators, the fertilization strategy is also considered as second relevant factor. These BFB guidelines collects the common protocols for field sampling and lab methods to be applied by all the SUREVEG partners involved on SUREVEG Task 3.3.
The press release describes the SUREVEG project CoreOrganic Cofund), focusing on objectives and t... more The press release describes the SUREVEG project CoreOrganic Cofund), focusing on objectives and tools to promote in EU and in Italy the crop diversification in organic vegetable croppimng systems. Strip cropping and different organic fertilization strategies will be applied to increase yield and quality of food; farmers involvement in development of strip cropping in Italian organic farms constitutes an added value of this project.
Isolation of Metarhizium spp. from root systems of different crops: Are specific genotypes associ... more Isolation of Metarhizium spp. from root systems of different crops: Are specific genotypes associated with certain plants?
AMBIO: A Journal of the Human Environment, 2000
JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, a... more JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
Økologisk Landsforening, Aug 19, 2019
Grønt i front! Plant Power! Hvad skal du ha' til din grøntsag? De staerke aktører inden for marke... more Grønt i front! Plant Power! Hvad skal du ha' til din grøntsag? De staerke aktører inden for markedsføring vil vaere med på den grønne bølge, som er sat i gang. Grøntsager er fremtiden. De er sunde, klimavenlige, miljørigtige, og de skal fylde meget mere på vores tallerkner og i den daglige kost for lige praecis vores egen skyld.
BMC Plant Biology
Purpose Beetroot is a model crop for studying root competition in intercropping systems because i... more Purpose Beetroot is a model crop for studying root competition in intercropping systems because its red-coloured roots facilitate non-destructive visual discrimination with other root systems of intercropped plants. However, beetroot also has white roots, which could alter how root competition is interpreted. Here we investigated the quantity of white versus red roots in beetroot to quantify the effect of this phenomenon. Methods Beetroot was mono-cropped or inter-cropped with white cabbage in a field trial. The distribution of beetroot roots was recorded to 2.5 m soil depth on three dates following the minirhizotron method. Roots in each 0.5 m soil layer were counted and categorised into groups based on colour (white roots, coloured roots, and white roots traced back to be coloured) to investigate the influence of white roots on accuracy of root registration. A pot experiment was conducted with three cultivars to verify if white roots are a general characteristic of beetroot. Resul...
Fertile soils are essential to the production of plant foods-especially to achieve high quality v... more Fertile soils are essential to the production of plant foods-especially to achieve high quality vegetables. Quality compost is made by recycling of organic waste material, for example plant residues from our gardens and city parks. We need to understand how compost affect soil fertility and plant growth. Compost is expected to stimulate soil life, improve soil structure and ability to hold water and nutrients, support plant growth and store carbon.
Intercropping can provide ecological and yield benefits when selecting crops and management pract... more Intercropping can provide ecological and yield benefits when selecting crops and management practices that
The UK homepage of DoubleCro
The first news release on the new project SUREVEG (CORE organic COFUND). SUREVEG is on strip-crop... more The first news release on the new project SUREVEG (CORE organic COFUND). SUREVEG is on strip-cropping systems and recycling of waste as the basis for biodiverse and resource-efficient intensive vegetable production.
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Papers by Hanne Kristensen