Georg Cadisch

Georg Cadisch
University of Hohenheim · Institute of Plant Production and Agroecology in the Tropics and Subtropics

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288
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Publications

Publications (288)
Article
Peak area (PA) integration of diffuse reflectance mid infrared Fourier transform spectroscopy (DRIFTS) spectra is useful to study soil organic matter (SOM) quality and as a potential modelling proxy. Residual water of soil samples after drying affects DRIFTS spectra, mainly in the region >2500 cm−1. Therefore, SOM quality related PA at different wa...
Article
Intensifying grassland-based ruminant livestock systems (GRLS) in the African Guinea Savanna could contribute to food and income security of the increasing African population. Grassland-based ruminant livestock models (GRLM) may be useful to holistically assess the efficacy and sustainability of different intensification options. Therefore, we eval...
Article
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Large‐scale conversion of natural forest to rubber plantations has taken place for decades in Southeast Asia making it a deforestation hotspot. Besides negative changes in biodiversity, ecosystem water and carbon budgets, converting forests to plantations often reduced CH4 uptake by soils. The latter process, which might be partly responsible for r...
Article
Full-text available
Biological nitrogen (N) fixation (BNF) plays a significant role in maintaining soil fertility in paddy field ecosystems. Rice variety influences BNF, but how different rice varieties regulate BNF and associated diazotroph communities has not been quantified. Airtight, field-based ¹⁵ N 2 -labelling growth chamber experiments were used to assess the...
Article
To match Nitrogen (N) supply to crop N demand, it is essential to understand N release and uptake patterns in different farming systems and crops. To assesses the dynamics of N released in organic and conventional systems and potential synchrony and asynchrony in crop N uptake, a study was conducted over three cropping seasons (potato, maize and le...
Article
Rubber farming expansion in Xishuangbanna, in the Upper Mekong region of Southwest China, has resulted in profound land use change and led to the severe degradation of the local environment. This study explores the dynamics of land use change as a result of the rubber boom, examines the factors influencing the heterogeneity in farmers' land allocat...
Article
Crop rotations in today’s swidden systems of Northern Thailand typically include five to ten years of fallow. Regarding ecosystem functions, these systems are relatively close to secondary forests when compared to modern agricultural systems; but they are under pressure for intensification, i.e. shortened fallow periods. In general, criteria are ne...
Article
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Essential environmental resources are rapidly exploited globally, while social-ecological systems at different scales fail to meet sustainable development challenges. Ecosystem services research, which at present predominantly utilizes static modelling approaches, needs better integration with socio-economic dynamics in order to assist a scientific...
Article
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The increase in global population and rapid change in human diets are putting enormous pressure on agricultural production, which already has a limited expansion capacity. By outlining possibilities for the sustainable intensification of agriculture, the research community can make a valuable contribution to alleviating some of these environmental...
Article
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The concept of ecosystem services (ESS) has been increasingly recognized for its potential in decision making processes concerning environmental policy. Multidisciplinary projects on rubber (Hevea brasiliensis) cultivation, integrating research on a variety of ESS, have been few and far between. More than three years of iterative workshops with reg...
Poster
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The tropical forage grass Brachiaria humidicola (Bh) reduces soil microbial nitrification by biological nitrification inhibition (BNI) and consequently reduces formation of nitrate (NO3-) in soils. NO3- leaching and nitrous oxide (N2O) emission might therefore be reduced by BNI. Intraspecific contrasting BNI potentials in Bh have been observed but...
Article
Conventional farming systems Agronomic efficiency of N use N-uptake efficiency N-utilization efficiency N-harvest index a b s t r a c t Increased per capita food production in the tropics is closely tied to soil organic matter and water management , timely nitrogen (N) supply and crop N use efficiency (NUE) which are influenced by farming systems....
Article
Full-text available
The expansion of large-scale plantations has a major impact on landscapes in the Tropics and Subtropics. Crops like soy bean, oil palm and rubber have led to drastic changes in land cover over the past decades, thereby altering ecosystem functions and services (ESS). Associated shifts in ESS such as climate regulation, erosion and water cycles, bio...
Article
Digital soil mapping (DSM) relies on statistical relationships between soil properties and covariates (e.g. terrain attributes, land use class, geology) which may not explain a large proportion of measured soil properties variability. This uncertainty combined with low spatial resolution of existing maps makes it difficult to monitor soils. Diffuse...
Article
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Load estimates are more informative than constituent concentrations alone, as they allow quantification of on- and off-site impacts of environmental processes concerning pollutants, nutrients and sediment, such as soil fertility loss, reservoir sedimentation and irrigation channel siltation. While statistical models used to predict constituent conc...
Article
Full-text available
The increasing expansion of rubber plantations throughout East and Southeast Asia urgently requires improved methods for effective mapping and monitoring. The phenological information from rubber plantations was found effective in rubber mapping. Previous studies have mostly applied rule-pixel-based phenology approaches for rubber plantations mappi...
Conference Paper
Full-text available
Among the essential macro elements for maize production, nitrogen (N) is the one limiting growth and yield the most. To maintain desired production levels, substantial amounts of N are required, mainly obtained through nitrogen fertilizer, a significant cost driver in maize production (13-18%). However, much of this fertilizer is lost after nitrifi...
Article
Full-text available
We studied the effects of Fusarium oxysporum f.sp. strigae (Fos), a soil-borne biocontrol agent (BCA) against Striga hermonthica, on total fungal and arbuscular mycorrhizal fungal (AMF) taxa in rhizospheres of maize in both clayey and sandy soil. Effects of Fos-BCA ‘Foxy-2’ were evaluated against (1) S. hermonthica presence, and (2) organic fertili...
Conference Paper
Full-text available
Abaca is economically important for the Philippines. Its fiber is highly demanded by the pulp and paper industry as it is an important resource for specialty papers, e.g. tea bag papers. Currently, Catanduanes Island of the Philippines is the world’s largest producer of abaca fibers, being an important smallholders’ income source. Traditionally, th...
Article
Full-text available
Fusarium oxysporum f.sp. strigae (Fos) is an effective biocontrol agent (BCA) against the parasitic weed Striga hermonthica. It acts in the rhizosphere of several tropical cereals, where it may interfere with indigenous microbial populations. To test this impact, we assessed in a 2-season field experiment at two contrasting tropical agro-ecological...
Conference Paper
Full-text available
The 'Reducing Emissions from Deforestation and forest Degradation' (REDD+) programme is promoted, in Southeast Asia and particularly in Thailand, as a cost-effective climate change miti-gation option with co-benefits to improve food security, local livelihoods and to foster sustainable forest management. The needs of local communities are critical...
Article
Mid-infrared spectroscopy has been used with various degrees of success in quantitative and qualitative analysis of soil organic matter (SOM). This study evaluated the spectral interference caused by soil carbonates on the feasibility of using the specific peak area approach obtained by diffuse reflectance infrared Fourier transform spectroscopy in...
Article
Full-text available
Load estimates are more informative than constituent concentrations alone, as they allow quantifying on- and off-site impacts of environmental processes concerning pollutants, nutrients and sediment, such as soil fertility loss, reservoir sedimentation and irrigation channel siltation. While statistical models used to predict constituent concentrat...
Article
Maintaining indigenous nutrient supply and positive nutrient balances are key factors in sustaining rice yields. Irrigation systems act as conveyers for water, sediments and nutrients throughout landscapes, especially in mountainous, cultivated tropical areas where erosivity is usually high. Contributions of erosion and irrigation to the nutrient b...
Article
Full-text available
Composite agricultural systems with permanent maize cultivation in the uplands and irrigated rice in the valleys are very common in mountainous southeast Asia. The soil loss and fertility decline of the upland fields is well documented, but little is known about reallocation of these sediments within the landscape. In this study, a turbidity-based...
Article
Full-text available
The last decades brought along a tremendous expansion of rubber plantations as well as respective socio-economic transformations. This paper reviews the historical development of rubber cultivation with special reference to intercropping and illustrates the major development steps. The agronomic challenges of intercropping are analyzed and a manage...
Article
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Recent studies have pointed out the potential of the compound specific stable isotope (CSSI) technique based on long-chain fatty acids methylester (FAME) to identify hot spots of soil erosion by means of land use types. We tested the applicability of the CSSI technique on the basis of soil and sediment samples derived from a small agriculturally us...
Article
Full-text available
class="para">Our objectives were to (1) monitor the proliferation of the biocontrol agent (BCA) Fusarium oxysporum f. sp. strigae strain “Foxy-2”, an effective soil-borne BCA against the parasitic weed Striga hermonthica, in the rhizosphere of maize under different agro-ecologies, and (2) investigate its impact on indigenous rhizosphere fungal comm...
Article
The response of agroecosystem carbon (C) respiration fluxes to environmental changes needs to be better understood as respiration subcomponents may respond differently to management and seasonal weather dynamics, which is important for soil organic matter (SOM) modeling. Respiration measurements at two different spatial and temporal scales (eddy co...
Conference Paper
Full-text available
Biological Nitrification Inhibition " (BNI) is a naturally occurring process by which soil nitrogen (N) is conserved in the less mobile form of ammonium (NH + 4) resulting in a reduction of nitrate (NO 3) leaching losses and N 2 O emissions. The pasture grass Brachiaria humidicola (Bh) is currently the most prominent species showing potential to na...
Article
Full-text available
Abstract Rapid expansion of natural rubber plantations in South-East Asia and other regions has greatly altered ecosystem based carbon (C) stocks with potential impacts on climate change mitigation and future C trading opportunities. Therefore, reliable estimations of carbon sequestration and emission at the landscape level after land cover transi...
Article
Dynamics of ammonia-oxidizing bacterial (AOB) and archaeal (AOA) abundance was assayed in a tropical Humic Nitisol during two cropping seasons of a long-term field experiment situated in the central highlands of Kenya. Since 2002, soils were treated yearly with biochemically contrasting organic inputs (4 Mg C ha−1 year−1) of Tithonia diversifolia (...
Article
Full-text available
Composite agricultural systems with permanent maize cultivation in the uplands and irrigated rice in the valleys are very common in mountainous Southeast Asia. The soil loss and fertility decline of the upland fields is well documented, but little is known about reallocation of these sediments within the landscape. In this study, a turbidity-based...
Conference Paper
Full-text available
Integrating resistant crop varieties and Fusarium oxysporum f.sp. strigae (Fos) as biocontrol agents (BCAs) was shown to be effective in controlling the parasitic weed Striga hermonthica which acts in the rhizosphere of several tropical cereals. Persistence of Fos inoculated to soils and its effects on beneficial indigenous microbial rhizosphere co...
Article
Agricultural production is the immediate basis for food security and income of the majority of Central Ethiopia׳s population. Demographic change has led to ever-decreasing farmland area per household and expansion of agriculture into marginal lands. Climatic extremes have been further aggravating the situation in large parts of the region. Governme...
Article
Land cover roughness coefficients (LCRs) have been used in multivariate spatial models to test the mitigation potential of coastal vegetation to reduce impacts of the 2004 tsunami in Aceh, Indonesia. Previously, a Landsat 2002 satellite imagery was employed to derive land cover maps, which were then combined with vegetation characteristics, i.e., s...
Article
Full-text available
Agroforestry systems have a large potential to increase systems’ productivity and provide soil conservation in hilly terrain but comprise complex interactions at the crop-soil-tree interface. Modelling can be an operational approach to unravel the later. We used the spatially explicit, dynamic Water Nutrient and Light Capture in Agroforestry System...
Article
Full-text available
Diffuse reflectance Fourier transformed mid-infrared (DRIFT-MIR) spectroscopy can predict many soil properties but extractable nutrients are often predicted poorly. This paper tested the combined DRIFT-MIR and total X-ray fluorescence (TXRF) spectroscopy analysis for prediction of soil properties related to soil fertility. A total of 700 soil sampl...
Article
Our objective was to develop an explicit AFLP-marker to quantify the abundance of Fusarium oxysporum f.sp. strigae (Fos), an effective soil-borne biocontrol agent (BCA) against the parasitic weed Striga hermonthica, in tropical soils. The specificity of the AFLP-marker to Fos was confirmed on basis of comparison of Fusarium isolates of differing re...
Conference Paper
Full-text available
In future, agriculture have to produce more food from less area to meet demands of growing population through efficient use of natural resources with minimal impact on the environment. Intercropping and agroforestry systems are important land uses to sustain tropical hillside agriculture. In a field trial with 20-25% slope located in western Thaila...
Article
Full-text available
More than 90% of the global natural rubber production originates from monoculture plantations in tropical Asia, especially from countries forming the Greater Mekong Subregion (GMS). Rubber cultivation is expected to further increase strongly in the near future, particularly at the expense of natural forests, and is accompanied by various problems a...
Conference Paper
Full-text available
Soil nitrogen (N) loss due to rapid nitrification (oxidation of ammonium to nitrate) is a serious problem with economic and environmental implications. As a result, a large proportion of N ferti-lisers applied to crops are lost to the environment via nitrate leaching and nitrous oxide emissions. The tropical pasture grass Brachiaria humidicola (Bh)...
Conference Paper
Full-text available
Biological Nitrification Inhibition (BNI) by the tropical pasture grass Brachiaria humidicola (Bh) suppresses the microbial conversion of relatively immobile ammonium (NH + 4) to very mobile nitrate (NO 3) in soils. BNI is expected to reduce nitrogen (N) losses by NO 3 leaching and nitrous oxide (N 2 O) emission. Smallholder farmers could benefit f...
Article
Full-text available
Soil conservation measures such as establishing grass barriers or cover crops effectively control erosion but also provoke competition, which reduces yields of companion crops. We used 13C and 15N natural abundance profiles to identify the causes of competition of soil conservation measures on a field with 59% slope in Northwest Vietnam three years...
Article
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Total element composition Africa soil Soil-forming factors Acrisols Lixisols Plinthosols Vertisols Arenosols Nitisols Ferralsols Leptosols Fluvisols Calcisols Cambisols Luvisols Alisols Gleysols A thorough understanding of the variation in total soil element concentrations is important especially in the Sub-Saharan Africa (SSA) soil contexts for ag...
Article
Development of spectroscopic prediction models via partial least squares regression (PLSR) suggests that model performance is highly affected by means of calibration and nature of the dataset. This study compares the predictive performance of PLSR models obtained by cross-validation and independent validation to quantify physico-chemical soil prope...
Article
Background and aims Hedgerow cropping decreases erosion in hillside agriculture but also competes for water and nutrients with crops. This study combined two methods for an improved understanding of water and nutrient competition at the crop-soil-hedge interface. Methods δ13C isotopic discrimination in plants and soil electrical resistivity tomogr...
Article
The integrated application of resistant crop varieties with biological control agents (BCAs) such as the Fusarium oxysporum [f.sp. strigae] strain “Foxy-2” has shown to be effective in fighting off the weed Striga hermonthica which is parasitic to several cereals cultivated in Sub-Saharan Africa (Schaub et al., 2006; Venne et al., 2009). “Foxy-2” p...
Article
Full-text available
Measurements of carbon dioxide (CO2)-evolution from soils are important in evaluating biomass and activity of soil microorganisms, as well as decomposition of soil organic matter. The Respi-cond VI is a fully computerized system allowing continuous measurement of CO2 evolution in short-and long-term soil incubation experiments in up to 96 incubatio...