"Valkama, Elena" - Selaus tekijän mukaan Luonnonvarakeskuksen julkaisut
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Delayed induced responses of birch glandular trichomes and leaf surface lipophilic compounds to mechanical defoliation and simulated winter browsing
Valkama, Elena; Koricheva, Julia; Ossipov, Vladimir; Ossipova, Svetlana; Haukioja, Erkki; Pihlaja, Kalevi
Oecologia (Springer-Verlag, 2005) -
Effectiveness of soil management strategies for mitigation of N2O emissions in European arable land: A meta‐analysis
Valkama, Elena; Tzemi, Domna; Esparza‐Robles, Ulises Ramon; Syp, Alina; O'Toole, Adam; Maenhout, Peter
European journal of soil science : 3 (Wiley-Blackwell, 2024)Soil management strategies involving the application of organic matter (OM) inputs (crop residues, green and livestock manure, slurry, digestate, compost and biochar) can increase soil carbon storage but simultaneously ... -
Effects of elevated O3, alone and in combination with elevated CO2, on tree leaf chemistry and insect herbivore performance: a meta-analysis
Valkama, Elena; Koricheva, Julia; Oksanen, Elina
Global Change Biology : 1 (Blackwell Publishing, 2007) -
EX-TRACT: An excel tool for the estimation of standard deviations from published articles
Acutis, Marco; Tadiello, Tommaso; Perego, Alessia; Di Guardo, Andrea; Schillaci, Calogero; Valkama, Elena
Environmental modelling and software (Elsevier, 2022) -
Fosforilaskuri
Uusitalo, Risto; Turtola, Eila; Hyväluoma, Jari; Alhainen, Virpi; Suomi, Kari; Valkama, Elena (Maa- ja elintarviketalouden tutkimuskeskusTehoPlus, 2013) -
Fånggrödor : nytta för odlaren och miljön
Lemola, Riitta; Valkama, Elena; Suojala-Ahlfors, Terhi; Känkänen, Hannu; Turtola, Eila; Heikkinen, Janne; Koppelmäki, Kari
Teho Plus -projektets publication : 8/2014 (TEHO Plus -projektet, 2014) -
Grain quality and N uptake of spring cereals as affected by nitrogen fertilization under Nordic conditions : a meta-analysis
Valkama, Elena; Salo, Tapio; Esala, Martti; Turtola, Eila
Agricultural and Food Science : 2 (2013) -
Hyötyä taseista : Ravinnetaseiden tulkinta ympäristön ja viljelyn hyödyksi
Turtola, Eila; Salo, Tapio; Miettinen, Antti; Iho, Antti; Valkama, Elena; Rankinen, Katri; Virkajärvi, Perttu; Tuomisto, Jussi; Sipilä, Anna; Muurinen, Susanna; Turakainen, Marja; Lemola, Riitta; Jauhiainen, Lauri; Uusitalo, Risto; Grönroos, Juha; Myllys, Merja; Heikkinen, Janne; Merilaita, Sami; Bernal, Jose Cano; Savela, Pertti; Kartio, Mirja; Salopelto, Juha; Finer, Aki; Jaakkola, Mikko
Luonnonvara- ja biotalouden tutkimus : 15/2017 (Luonnonvarakeskus, 2017)Hyötyä taseista -hankkeessa tuotettiin typen peltotaseiden jakaumat Suomen yleisimmille viljelykasveille yhdistämällä kaikki saatavilla oleva ja systemaattisesti kerätty ravinnetasetieto peltoviljelystä. Jakaumien perusteella ... -
Is organic farming environmentally friendly in North Europe?
Valkama, Elena; Perego, Alessia; Acutis, Marco
AMS Acta (2021)In North-European agriculture there is a risk of nitrogen leaching and the losses of soil organic C. Organic farming is regarded as a valuable option to halt these negative trends. In this study, the soil C dynamic and the ... -
Kerääjäkasvit : hyötyä viljelijälle ja ympäristölle
Lemola, Riitta; Valkama, Elena; Suojala-Ahlfors, Terhi; Känkänen, Hannu; Turtola, Eila; Heikkinen, Janne; Koppelmäki, Kari
TEHO Plus -hankkeen julkaisu (Varsinais-Suomen ELY-keskus, 2014) -
Leaf surface traits: overlooked determinants of birch resistance to herbivores and foliar micro-fungi?
Valkama, Elena; Koricheva, Julia; Salminen, Juha-Pekka; Helander, Marjo; Saloniemi, Irma; Saikkonen, Kari; Pihlaja, Kalevi
Trees - Structure and Function (2005) -
Management of legacy nutrient stores through nitrogen and phosphorus fertilization, catch crops, and gypsum treatment
Sihvonen, Matti; Lintunen, Jussi; Valkama, Elena; Hyytiäinen, Kari
Natural Resource Modeling : 4 (Wiley, 2020)We develop a modeling framework, based on discrete‐time dynamic optimization, to study the effect of legacy nutrient stores and soil nutrient dynamics on optimal nutrient management and agri‐environmental policy in crop ... -
Meta-analysis of the effects of undersown catch crops on nitrogen leaching loss and grain yields in the Nordic countries
Valkama, Elena; Lemola, Riitta; Känkänen, Hannu; Turtola, Eila
Agriculture, Ecosystems and Environment (Elsevier, 2015) -
Meta-analysis protocol on the effects of cover crops on pool specific soil organic carbon
Fohrafellner, Julia; Zechmeister-Boltenstern, Sophie; Murugan, Rajasekaran; Keiblinger, Katharina; Spiegel, Heide; Valkama, Elena
MethodsX (Elsevier BV, 2023)Soil organic carbon (SOC) plays an important role in agricultural soils, as it contributes to overall soil health as well as climate change mitigation and adaptation. By conducting a meta-analysis, we aim to quantitatively ... -
Modeling of soil organic carbon and carbon balance under conservation agriculture in Kazakhstan
Valkama, Elena; Kunypiyayeva, Gulya; Zhapayev, Rauan; Karabayev, Muratbek; Zhusupbekov, Erbol; Acutis, Marco (FAO, 2020)Traditional farming systems, involving intensive tillage, returning the low amounts of organic matter to field and frequently monoculture, lead to a decrease in soil organic carbon (SOC) and land degradation. In contrast, ... -
Modelling of Soil Organic Carbon Dynamics in Kazakhstan
Valkama, Elena; Acutis, Marco; Kunypiyaeva, Gulya; Zhapayev, Rauan; Karabayev, Muratbek (Soil Science Society of Kazakhstan, 2018) -
New pedotransfer approaches to predict soil bulk density using WoSIS soil data and environmental covariates in Mediterranean agro-ecosystems
Schillaci, Calogero; Perego, Alessia; Valkama, Elena; Märker, Michael; Saia, Sergio; Veronesi, Fabio; Lipani, Aldo; Lombardo, Luigi; Tadiello, Tommaso; Gamper, Hannes A.; Tedone, Luigi; Moss, Cami; Pareja-Serrano, Elena; Amato, Gabriele; Kühl, Kersten; Dămătîrcă, Claudia; Cogato, Alessia; Mzid, Nada; Eeswaran, Rasu; Rabelo, Marya; Sperandio, Giorgio; Bosino, Alberto; Bufalini, Margherita; Tunçay, Tülay; Ding, Jianqi; Fiorentini, Marco; Tiscornia, Guadalupe; Conradt, Sarah; Botta, Marco; Acutis, Marco
Science of the total environment (Elsevier, 2021) -
Nitrogen balances and yields of spring cereals as affected by nitrogen fertilization in northern conditions: A meta-analysis
Valkama, Elena; Salo, Tapio; Esala, Martti; Turtola, Eila
Agriculture, ecosystems & environment (Elsevier, 2013) -
Nitrogen fertilization of grass leys: Yield production and risk of N leaching
Valkama, Elena; Rankinen, Katri; Virkajärvi, Perttu; Salo, Tapio; Kapuinen, Petri; Turtola, Eila
Agriculture, Ecosystems and Environment (Elsevier Science, 2016) -
Phosphorus and Nitrogen Yield Response Models for Dynamic Bio-Economic Optimization: An Empirical Approach
Sihvonen, Matti; Hyytiäinen, Kari; Valkama, Elena; Turtola, Eila
Agronomy : 4 (MDPI, 2018)