Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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A model for estimating phosphorus requirements of world food production
Helin, J. ; Weikard, Hans-Peter - \ 2019
Agricultural Systems 176 (2019). - ISSN 0308-521X

Continuing growth of world population will require food production to increase significantly in order to satisfy the needs of an increasing number of people. This study focuses on the role of phosphorus, an essential (non-substitutable) nutrient for all primary food production. A major share of the world's phosphorus flows, both mined and recycled, is used in agriculture. This study combines the latest revised population growth predictions of United Nations with food balances, long-run income predictions, and per-country income elasticity estimates to assess the minimum phosphorus needs for food production in the 21st century. We predict countries' crop and animal production, which will play a key role in the future demand for phosphorus. We demonstrate a novel method for estimating the long-run phosphorus demand based on the volume of food production and the phosphorus content of food products. We find a fairly stable demand trajectory for phosphorus on the global level for the medium-variant population growth projection. Thus, by the end of this century, the expected (medium) demographic changes lead to increasing the demand for mined phosphorus up to 23 Mt. per annum (compared to 18 Mt. in 2018). Furthermore, the growth in demand is largely driven by income growth and shifting consumption patterns which could push the expected annual phosphorus demand from 23 Mt. to 52 Mt. by the end of the century.

The value of manure - Manure as co-product in life cycle assessment
Leip, Adrian ; Ledgard, Stewart ; Uwizeye, Aimable ; Palhares, Julio C.P. ; Aller, M.F. ; Amon, Barbara ; Binder, Michael ; Cordovil, Claudia M.D.S. ; Camillis, Camillo De; Dong, Hongming ; Fusi, Alessandra ; Helin, Janne ; Hörtenhuber, Stefan ; Hristov, Alexander N. ; Koelsch, Richard ; Liu, Chunjiang ; Masso, Cargele ; Nkongolo, Nsalambi V. ; Patra, Amlan K. ; Redding, Matthew R. ; Rufino, Mariana C. ; Sakrabani, Ruben ; Thoma, Greg ; Vertès, Françoise ; Wang, Ying - \ 2019
Journal of Environmental Management 241 (2019). - ISSN 0301-4797 - p. 293 - 304.
Livestock production is important for food security, nutrition, and landscape maintenance, but it is associated with several environmental impacts. To assess the risk and benefits arising from livestock production, transparent and robust indicators are required, such as those offered by life cycle assessment. A central question in such approaches is how environmental burden is allocated to livestock products and to manure that is re-used for agricultural production. To incentivize sustainable use of manure, it should be considered as a co-product as long as it is not disposed of, or wasted, or applied in excess of crop nutrient needs, in which case it should be treated as a waste. This paper proposes a theoretical approach to define nutrient requirements based on nutrient response curves to economic and physical optima and a pragmatic approach based on crop nutrient yield adjusted for nutrient losses to atmosphere and water. Allocation of environmental burden to manure and other livestock products is then based on the nutrient value from manure for crop production using the price of fertilizer nutrients. We illustrate and discuss the proposed method with two case studies.
Natural variation in tolerance to sub-zero temperatures among populations of Arabidopsis lyrata ssp. petraea
Davey, Matthew P. ; Palmer, Ben G. ; Armitage, Emily ; Vergeer, Philippine ; Kunin, William E. ; Woodward, F.I. ; Quick, W.P. - \ 2018
BMC Plant Biology 18 (2018)1. - ISSN 1471-2229
Acclimation - Arabidopsis lyrata ssp. petraea - Chlorophyll fluorescence - Marginal populations - Survival

BACKGROUND: Temperature is one of the most important abiotic factors limiting plant growth and productivity. Many plants exhibit cold acclimation to prepare for the likelihood of freezing as temperatures decrease towards 0 °C. The physiological mechanisms associated with enabling increased tolerance to sub-zero temperatures vary between species and genotypes. Geographically and climatically diverse populations of Arabidopsis lyrata ssp. petraea were examined for their ability to survive, maintain functional photosynthetic parameters and cellular electrolyte leakage integrity after being exposed to sub-zero temperatures. The duration of cold acclimation prior to sub-zero temperatures was also manipulated (2 and 14 days). RESULTS: We found that there was significant natural variation in tolerances to sub-zero temperatures among populations of A. petraea. The origin of the population affected the acclimation response and survival after exposure to sub-zero temperatures. Cold acclimation of plants prior to sub-zero temperatures affected the maximum quantum efficiency of photosystem II (PSII) (Fv/Fm) in that plants that were cold acclimated for longer periods had higher values of Fv/Fm as a result of sub-zero temperatures. The inner immature leaves were better able to recover Fv/Fm from sub-zero temperatures than mature outer leaves. The Irish population (Leitrim) acclimated faster, in terms of survival and electrolyte leakage than the Norwegian population (Helin). CONCLUSION: The ability to survive, recover photosynthetic processes and cellular electrolyte leakage after exposure to sub-zero temperatures is highly dependent on the duration of cold acclimation.

Assessing adaptive management options to cope with climate change at the farm level
Rötter, R.P. ; Lehtonen, H. ; Kahiluoto, J. ; Helin, J. ; Palosuo, T. ; Salo, T. ; Pavlova, Y. ; Wolf, J. ; Carter, T.R. ; Ewert, F. - \ 2010
In: Proceedings, FAO-IRRI workshop on Advanced technologies of rice production for coping with climate change: No-regret options for adaptation and mitigation, 23-25 June 2010 Los Banos, Philippines. - Philippines : IRRI - p. 77 - 81.
klimaatverandering - klimaatadaptatie - bedrijfssystemen - landbouw - climatic change - climate adaptation - farming systems - agriculture
In recent years, considerable achievements have been made by several European climate research groups in gaining a better understanding of and in developing methodologies and tools for integrated, multiscale analyses of how to adapt agricultural systems to climate change. Efforts are under way to link these advancements with the CGIAR-led program on “Climate Change, Agriculture, and Food Security” (CCAFS) for the developing world. In this context some methodological advancements and findings are presented from Finnish and European collaborative research on integrated assessment and modeling (IAM) of agrifood systems in the context of climate change.
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