Shyam PariyarUniversity of Bonn | Uni Bonn · Institute of Crop Science and Resource Conservation (INRES) - Plant Nutrition
Shyam Pariyar
PhD
Research and Teaching
About
33
Publications
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Introduction
I am a currently working at INRES-Plant Nutrition, University of Bonn. My research interests are: i) Cropping System shift, yield and quality ii) Supply - demand synchrony in nutrients management, iii) Abiotic stress and stress physiology, iv) Crop residues recycling, high value molecules and Bioeconomy and v) Plant health management, all based in lab to farmers field. My teaching activities include plant health management, crop abiotic stress (& sensing) and recent advances in plant nutrition.
Additional affiliations
April 2015 - present
Publications
Publications (33)
Climate change affects changes in rice-based systems of coastal Bangladesh. Both external pressures and system-immanent attributes influence farmers’ adoption of new production practices, leading to the emergence of new land use patterns. Field and household surveys quantified recent and emerging change trends in crop yields and associated intensif...
We analyzed change trends in rice-based production system in SE Asia using diachronic analyses (past vs. present). • Nutrient management and laborsaving strategies dominate adoption of "new" rice practices and differ between sites. • Diversified rice-upland crop rotation has gained importance in rainfed systems. • Intensified double rice with high...
Introduction
Many atmospheric aerosols are hygroscopic and play an important role in cloud formation. Similarly, aerosols become sites of micro-condensation when they deposit to the upper and lower surfaces of leaves. Deposited salts, in particular can trigger condensation at humidities considerably below atmospheric saturation, according to their...
Production increases in lowland rice-based systems of Southeast Asia will not be possible without the addition of nutrients. Recent productivity gains were largely based on increasing the use efficiency of the applied nutrients through integrated and site-specific approaches. The adoption of such strategies has evolved differentially in the various...
The wetting behaviour of the spray and the biological efficacy of Cu²⁺ active ingredients in agrochemical formulations may be enhanced by tank‐mix additives. We investigated how three BREAK‐THRU® additives (BT301: biodegradable, BT133 and BT420: bio‐based and biodegradable) tank‐mixed with commercial copper preparations influenced the spray distrib...
The wetting behaviour of the spray and biological efficacy of Cu2+ active ingredients in agrochemical formulations may be enhanced by tank-mix additives. We investigated how three BREAK-THRU additives (BT301: biodegradable, BT133 and BT420: bio-based and biodegradable) as tank-mix with commercial copper preparations influence the spray distribution...
Since the advent of the green revolution, rice-based production systems and cultivation practices in the Philippines have been continuously changing. Recently implemented Rice Trade Liberalization Law permits cheap rice imports and reduces rice prices for domestic producers in the Philippines. At the same time, the costs for agrochemicals have near...
The understanding of changes in plant species' responses to the interactive effects of land use and climate is not only an important area of research, but could also inform on the effect of such interactions on the composition and structure of future plant biodiversity. We hypothesized that rainfall and land use affect the composition and diversity...
In times of a constantly growing world population and increasing demand for food, sustainable agriculture is crucial. The rainfastness of plant protection agents is of pivotal importance to reduce the amount of applied nutrients, herbicides, and fungicides. As a result of protective agent wash-off, plant protection is lost, and soils and groundwate...
In times of a constantly growing world population and increasing demand for food, sustainable agriculture is crucial. To reduce the amount of applied nutrients, herbicides, and fungicides, the rainfastness of plant protection agents is of pivotal importance. As a result of protective agent wash-off, plant protection is lost, and soils and groundwat...
The shift in rice production systems from aerobic to anaerobic and fertilizer management may create an environment which can affect physicochemical properties of soil. The change in soil pH (acidification or alkalization) consequently alter the availability of macro- and micro-nutrients and their uptake. In this study, we hypothesized that the pH a...
Tantalum (Ta) is gaining attention as a biomaterial in bone tissue engineering. Although the clinical advantage of Ta-based implants for primary and revision total joint replacement (TJA) has been well documented, few studies investigated the effect of wear products of Ta implants on peri-implant cells, and their potential contribution to aseptic i...
Rain wash-off of foliar-applied agrochemical formulations (i.e. active ingredients) is a key topic to ensure crop protection under rainy conditions and for some regions will gain higher importance due to global climate change. Rain-induced wash-off is determined by intensity and amount of rain, as well as by characteristics of the active ingredient...
Maximize process of pest control reducing loss in the agriculture process is fundamental. The aim this research was to achieve a different way to increase the herbicide activity, using potassium salts. Some experiments were conduct to analyze the efficiency of salts in enhanced the activity of two selected herbicides (paraquat and bromoxynil). Firs...
To reduce pesticide use while preserving crop productivity alternative pest and disease control measures are needed. We thought of an alternative way of functionalizing leaves of the soybean crop to fight its most severe disease, Asian soybean rust (Phakopsora pachyrhizi). To do so, we produced bifunctional peptides that adhere to the soybean leaf...
Anthropogenic aerosol pollution has intensified in (semi)-urban environments. Plant surfaces can accumulate a part of these aerosol particles in the terrestrial ecosystem. The deposition of aerosols on plant surfaces is a continuous process and is expected to be especially high in peri-urban agricultural environments. However, the deposited aerosol...
Adjuvants such as surfactants are commonly incorporated into agrochemical formulations to enhance the biological efficiency of foliar sprays by improving the wetting behavior of the spray and/or the penetration of the active ingredients into the leaf tissues. Penetration accelerating adjuvants are known to increase the cuticular permeability and ma...
Some 40 years ago, air pollution caused widespread forest decline in Central Europe and eastern North America. More recently, high levels of tree mortality worldwide are thought to be driven by rising temperatures and increasing atmospheric drought. A neglected factor, possibly contributing to both phenomena, is the foliar accumulation of hygroscop...
Previous flux measurements in the perhumid cloud forest of northeastern Taiwan have shown efficient photosynthesis of the endemic tree species Chamaecyparis obtusa var. formosana even under foggy conditions in which leaf surface moisture would be expected. We hypothesized this to be the result of 'xeromorphic' traits of the Chamaecyparis leaves (hy...
The atmospheric vapor pressure deficit (vpd) is the driving force for plant transpiration. Plants have different strategies to respond to this ‘atmospheric drought.’ Deposited aerosols on the surface of plant leaves can interact with plant water relations and may influence the vpd response of plants. We studied the transpiration and water use effic...
Air pollution causes the amorphous appearance of epicuticular waxes in conifers, usually called wax 'degradation' or 'erosion', which is often correlated with tree damage symptoms, e.g., winter desiccation. Previous investigations concentrated on wax chemistry, with little success. Here, we address the hypothesis that both 'wax degradation' and dec...
Aerosols are an ubiquitous component of the atmospheric environment of plants but their ecophysiological role is largely unknown. Here we address this role by comparing the water relations of plants grown in ventilated greenhouses with ambient air (AA), and filtered air (FA) where particle concentrations had been reduced by more than 99%. Beans and...
The recent visualization of stomatal nanoparticle uptake ended a 40‐yr‐old paradigm. Assuming clean, hydrophobic leaf surfaces, the paradigm considered stomatal liquid water transport to be impossible as a result of water surface tension. However, real leaves are not clean, and deposited aerosols may change hydrophobicity and water surface tension....
Theoretical explanations of dew formation usually consider a pure, plain surface and do not include any contributions of hygroscopic material present on this surface. A significant amount of hygroscopic material, however, is present on most real leaves, due to accumulated deposited aerosols, salt exudations, leached ions, or agricultural sprays. Si...
Nutrient input by atmospheric particles is important or even essential for forest ecosystems. Many particles will first deposit to leaf surfaces. Competition is avoided by direct foliar uptake, compared to uptake via the soil. While there is meanwhile clear evidence for foliar uptake to happen via the stomata under natural conditions, this requires...