110 research outputs found
Prognosmodell för behovsanpassad bekÀmpning av Alternaria
Alternariasvampens betydelse som skadegörare i potatis har ökat i takt med att dithiocarbamatpreparaten (Mancozeb/Maneb) fasats ut som bladmögelpreparat. Odlarna efterfrÄgar verktyg för att ÄrsmÄnsanpassa alternariabekÀmpningen och i projektet provades en prognosmodell.
BÄde de odlare och rÄdgivare som provade var i princip positiva till modellen men man ifrÄgasatte om den inte rekommenderar för mycket bekÀmpning. NÄgra viktiga frÄgor
identifierades varav vissa i efterhand besvarats
av modellutvecklarna. Trots det kvarstÄr ett visst behov av uppföljda experiment
Comparison of Measurements of Autoantibodies to Glutamic Acid Decarboxylase and Islet Antigen-2 in Whole Blood Eluates from Dried Blood Spots Using the RSR-Enzyme Linked Immunosorbent Assay Kits and In-House Radioimmunoassays
To evaluate the performance of dried blood spots (DBSs) with subsequent analyses of glutamic acid decarboxylase (GADA) and islet antigen-2 (IA-2A) with the RSR-ELISAs, we selected 80 children newly diagnosed with type 1 diabetes and 120 healthy women. DBSs from patients and controls were used for RSR-ELISAs while patients samples were analysed also with in-house RIAs.
The RSR-ELISA-GADA performed well with a specificity of 100%, albeit sensitivity (46%) was lower compared to in RIA (56%; P = .008). No prozone effect was observed after dilution of discrepant samples. RSR-ELISA-IA-2A achieved specificity of 69% and sensitivity was lower (59%) compared with RIA (66%; P < .001). Negative or low positive patients and control samples in the RSR-ELISA-IA-2A increased after dilution. Eluates from DBS can readily be used to analyse GADA with the RSR-ELISA, even if low levels of autoantibodies were not detected. Some factor could disturb RSR-ELISA-IA-2A analyses
Long-term effects of liming on crop yield, plant diseases, soil structure and risk of phosphorus leaching
This study examined the long-term effects of applying structure lime (mixture of ~80% CaCO3 and 20% Ca(OH)2) and ground limestone (CaCO3) on soil aggregate stability and risk of phosphorus (P) losses 5â7 years after liming, incidence of soil-borne diseases and yield in winter wheat (Tritium aestivum), oilseed rape (Brassica napus) and sugar beet (Beta vulgaris). Lime was applied in 13 field trials in Sweden 2013â2015 and soil characteristics and crop yield were monitored until 2021. Seedbed (0â4 cm depth) aggregate (2â5 mm size) stability was improved to the same extent with both lime treatments compared to the untreated control, sampled 5â7 years after liming. Analyses and estimations of different P fractions (total P, PO4-P, and particulate P) in leachate following simulated rainfall events on undisturbed topsoil cores sampled 6â8 years after liming revealed lower total P and particulate P concentrations in both lime treatments compared to the untreated control. Two sugar beet trial sites with soil pH â€7.2 before liming showed an increase in sugar yield for structure lime and ground limestone as an effect of increased concentration of soil potassium (K-AL) and/or lower Aphanomyces root rot potential compared to the untreated control. The yield of winter wheat was not affected by the application of either type of lime at sites with pH >7.2 but the yield of oilseed rape decreased after the application of structure lime
Liming alkaline clay soils: effects on soil structure, nutrients, barley growth and yield
Liming before cultivation of sugar beets is favourable even on alkaline soils but knowledge of response in other crops is lacking. Therefore, effects of ground limestone (GL) and structure lime (SL1 slaked lime or SL2 mix of ground limestone and slaked lime) were evaluated in southern Sweden on soil structure, growth and nutrient concentration in barley under four fertilisation strategies 1.5â2 years after application. All lime products increased aggregate stability, but with variations between locations. A lower proportion of large aggregates was found in both limed treatments, and a higher proportion of small aggregates in SL. In barley, grain yield was unaffected while shoot numbers and biomass in first node stage increased for GL and biomass increased further for SL. Structure lime increased potassium concentration in plants in first node stage, due to more potassium in the product. Both lime types increased molybdenum concentration. Ground limestone reduced zinc concentration compared with no liming. Finer seedbed tilth and increased aggregate stability may explain increased biomass for GL. Higher potassium content in SL might be a further explanation. No interactions between liming and fertilisation were found. In conclusion, on the soil types studied, no change of fertilisation strategy is needed due to liming
Long-term effects of liming on crop yield, plant diseases, soil structure and risk of phosphorus leaching
This study examined the long-term effects of applying structure lime (mixture of ~80% CaCO3 and 20% Ca(OH)2) and ground limestone (CaCO3) on soil aggregate stability and risk of phosphorus (P) losses 5â7 years after liming, incidence of soil-borne diseases and yield in winter wheat (Tritium aestivum), oilseed rape (Brassica napus) and sugar beet (Beta vulgaris). Lime was applied in 13 field trials in Sweden 2013â2015 and soil characteristics and crop yield were monitored until 2021. Seedbed (0â4 cm depth) aggregate (2â5 mm size) stability was improved to the same extent with both lime treatments compared to the untreated control, sampled 5â7 years after liming. Analyses and estimations of different P fractions (total P, PO4-P, and particulate P) in leachate following simulated rainfall events on undisturbed topsoil cores sampled 6â8 years after liming revealed lower total P and particulate P concentrations in both lime treatments compared to the untreated control. Two sugar beet trial sites with soil pH â€7.2 before liming showed an increase in sugar yield for structure lime and ground limestone as an effect of increased concentration of soil potassium (K-AL) and/or lower Aphanomyces root rot potential compared to the untreated control. The yield of winter wheat was not affected by the application of either type of lime at sites with pH >7.2 but the yield of oilseed rape decreased after the application of structure lime
Leder: Evidensbaseret pedagogisk praksis
Tidsskriftet Paideia sÊtter i dette nummer fokus pÄ, hvordan man bygger bro mellem forskning og pÊdagogisk praksis. Tidsskriftet indeholder fem forskningsartikler, der alle har vÊret gennem fagfÊllers review og bedÞmmelse
Leder: Kampen om lĂŠrer- og pĂŠdagogprofessionen
Tidsskriftet Paideia handler denne gang om, hvad det vil sige at vĂŠre en professionel lĂŠrer eller pĂŠdagog. Dette diskuteres i fire forskningsartikler, der alle har vĂŠret gennem fagfĂŠllers review og bedĂžmmelse
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