Mapping Soil Organic Carbon Changes in Hungary: A Novel Approach Using Machine Learning and Space-Time Geostatistics

The presented methodology stands out by using a hybrid approach that integrates machine learning with space-time geostatistics, addressing key limitations of previous approaches. It allows for reliable SOC predictions along with uncertainty estimates at any spatial and temporal scale, even in years where no direct SOC measurements are available. This comprehensive method offers a more robust and dynamic understanding of SOC changes not just in space but also in time. The compiled map series provide valuable information for researchers, society and even policymakers, helping to tackle environmental challenges such as land and soil degradation, climate change, and ecosystem assessment. These findings support ongoing initiatives like the EU Soil Monitoring Directive and the UN Sustainable Development Goals, offering practical tools for tracking SOC changes and assessing soil health over time.

This research fills a key gap in our understanding of SOC dynamics in Hungary and offers a methodology that can be adapted internationally to improve the accuracy and utility of SOC data to address the environmental challenges and crises of our time.

Szatmári, G., Pásztor, L., Takács, K., Mészáros, J., Benő, A., Laborczi, A. (2024): Space-time modelling of soil organic carbon stock change at multiple scales: Case study from Hungary. Geoderma 451, 117067. https://doi.org/10.1016/j.geoderma.2024.117067

Towards a harmonized European Soil monitoring network: comparison of national and European soil information systems

In Europe, different types of monitoring networks currently exist in parallel. Many EU Member states developed their own national soil information monitoring system, some being in place for decades (e.g. the Hungarian Soil Information and Monitoring System). In parallel in 2009, the European Commission extended the periodic Land Use/Land Cover Area Frame Survey (LUCAS) led by EUROSTAT to sample and analyse the main properties of topsoil in EU in order to develop a homogeneous dataset for EU.

The latest publication compares the soil sampling strategies (e.g. spatial density, distribution of soil types and land cover) within countries in the national and the European soil information system. The distribution of three basic soil properties (pH, organic carbon, and clay content) and two soil health indicators (organic carbon/clay ratio and pH classes) are also compared. The comparison highlights the differences and gaps between national and international soil information databases across countries, the potential and obstacles to their combined use, and the need to harmonise the methodology used by each country.

Froger et al. 2024. Comparing lucas soil and national systems: Towards a harmonized European Soil Monitoring Network. Geoderma, 449, 117027. https://doi.org/10.1016/j.geoderma.2024.117027

Effect of potassium supply and plant density on maize – results of a long term field trial

Different potassium supply levels were achieved by the initial build-up in autumn 1989. Adequate nitrogen and phosphorus supplies were provided by yearly NP fertilization. The year studied was favourable for maize growth and development. The plant density had a more pronounced effect on grain yield than the different K supplies. Stalk yields showed trends similar to those for grain yields, but plant density had the opposite effect on the leaf weight in the flowering stage. K fertilization increased the K content to the greatest extent in the vegetative parts (leaf and stalk), while increasing plant density had a reverse effect. The K-Ca-Mg antagonism was also the most pronounced in the vegetative parts, i.e. maize leaves in the flowering stage.

According to the results obtained in the field trial, it seems that a century ago, in our grandparents’ time, food contained more minerals than nowadays, due to the fact that plant density decreases grain mineral composition more than mineral fertilization can increase it.

The results of the research can be found in the following publication:

Csathó, P., Szabó, A., Pokovai, K., Árendás, T. Effect of potassium supply and plant density on maize (Zea mays L.) yields and nutrient contents: a case study in a Hungarian long-term field trial set up on calcareous chernozem soil. CEREAL RESEARCH COMMUNICATIONS (2024). https://doi.org/10.1007/s42976-024-00574-8

Registration for the Budapest Soil Health Forum events

The Forum consists of four events, including two international conferences, a workshop and a panel discussion:

Our colleagues play a major role in the organisation of the Forum, moreover the HUN-REN ATK Soil Science Institute is the organiser of the conference “Improving Soil Health” as well as co-organiser of the conference “Artificial Intelligence for Soil Health”.

More information about the events and registration is available at soilhealthforum.hu

Farmers’ perception of soil health in the EU and in China

The results made it clear that the farm size, the management methods and the level of education of the farm managers were significantly associated with perceptions of soil degradation issues. This suggests that the provision of information on soil degradation to farmers in an appropriate format is key to the application of measures to counteract it. Projects such as TUdi can help to create collaborative networks to encourage the uptake of technologies widely adopted by farmers and thus reverse the degradation of agricultural land.

Grass cover and shallow tillage inter-row soil cultivation affecting CO2 and N2O emissions in a sloping vineyard in upland Balaton, Hungary

The researchers of the HUN-REN CAR Institute for Soil Sciences investigated the effects of tillage practices and slope positions on soil-health and the two most important soil-derived greenhouse gas emissions, CO2 and N2O, for a vineyard in the Balaton Uplands. Intact soil samples were used from grass covered (A) and ploughed (B) slopes, simulating dry and rainfall conditions under laboratory conditions. The influence of different soil health indicators (soil organic carbon and nitrogen, pH, soil water content) on the emissions were also determined.
Soil CO2 and N2O emissions were higher on the grass covered slope compared to the ploughed soil due to the higher observed root biomass, soil moisture, and nutrient content, which indicates a more active soil life. Although higher emissions can be measured in the grass covered slope, the improved soil health is just as important for the conservation of our soils. The experiment also showed that heavy rainfall increases soil moisture content that in turn can lead to higher emission peaks. Slope position also affected greenhouse gas emissions, with higher values measured at the upper points. The emission values correlated the most with soil organic carbon, nitrogen content, and soil pH. These result can be a base for biogeochemical model calibrations and validations.

Soil bacterial communities affected by cultivation methods and land-use types in a small catchment near Lake Balaton

The research team studied the microbiological changes in soil cultivation and different land use types during different phenological phases, such as the summer (flowering) around July and the autumn (harvest) periods, which are microbiologically prominent times.
The studies were carried out on a small catchment in the Balaton Uplands, where soil samples from different inter-row cultivation (tilled and permanent grass cover) of a vineyard, and different land use types (forest, grassland, vineyard, and cropland) were investigated. The samples were taken at different locations along slope gradients.
The studies highlight that anthropogenic influences strongly affect the structure of soil bacterial communities. The results showed that both soil physicochemical properties and the taxonomic diversity of bacterial communities resulted in a primary separation between less cultivated (forest and grassland) and highly cultivated (vineyard and cropland) soils. The highest bacterial taxonomic diversity was observed in the undisturbed forest soils with the highest organic carbon content. In terms of bacterial community structure, the effect of slope and soil transect was the strongest in the forest soils, while the effect of seasonality was most pronounced in the cropland soils.

Borsodi, A.K., Megyes, M., Zsigmond, T., Horel, Á. 2024. Soil bacterial communities affected by land-use types in a small catchment area of the Balaton Uplands (Hungary). BIOLOGIA FUTURA. https://doi.org/10.1007/s42977-024-00233-3

Besze, B.Z., Borsodi, A.K., Megyes, M., Zsigmond, T., Horel, Á. 2024. Changes in the taxonomic composition of soil bacterial communities under different inter-row tillage managements in a sloping vineyard of the Balaton Uplands (Hungary). BIOLOGIA FUTURA. https://doi.org/10.1007/s42977-024-00234-2

OPTAIN 2nd Webinar – Natural Small Water Retention Measures

The webinar will focus on the technical aspects of SWAT modelling and optimisation, but non-modelling experts interested in the topic are also welcome to participate.

 

Participation is free but registration is required and can be found at the following link.

#OPTAIN #Webinar #Water Retention #SWATModelling #AgriculturalResearch

Micropropagation for the conservation of protected plant species: a case study with the highly protected lilyleaf

Adverse processes in the habitats of protected plant species are making it increasingly important to develop proper ex situ methods for future conservation actions. Micropropagation is a method of plant propagation for rapid multiplication of plants in a short duration under in vitro conditions. The aim of this study was to develop a micropropagation protocol for lilyleaf and to evaluate the effects of diverse plant growth regulators (PGR) and natural extracts used on the growth and development of the plantlets. The ideal growth medium was the ½ MS medium. Silver nitrate (AgNO3) added to the medium at a concentration of 5 mg L-1 led to an increase in root formation and shoot length, although higher concentration levels adversely affected root development. Increasing the concentration of NAA (1-naphthyl acetic acid) resulted in a decrease in the morphological parameters studied. Coconut water at 50 ml L-1 promoted root formation, but at elevated doses root formation was inhibited while shoot formation was stimulated. Optimization of pH levels from 6.8-7 to 7.8-8.0 significantly increased plant height and root formation, and significant carotenoid accumulation occurred at pH 6.8-7. Overall, the protocol developed allows the successful propagation of the species under in vitro conditions, supporting the future conservation of the species.