Thomas Hebeisen - Academia.edu (original) (raw)

Papers by Thomas Hebeisen

Research paper thumbnail of Actualités de la recherche sur la pomme de terre

Recherche Agronomique Suisse, 2012

Research paper thumbnail of Essais variétaux et culturaux sur le pavot d'hiver

Recherche Agronomique Suisse, 2014

Research paper thumbnail of Liste suisse des variétés de pommes de terre 2010

Revue Suisse D Agriculture, 2009

Research paper thumbnail of Eignung von neuen Sommerölleinsorten für den Ökolandbau im Schweizer Mittelland

Oil flax was cropped in Switzerland in former times but seldom today. To investigate new varietie... more Oil flax was cropped in Switzerland in former times but seldom today. To investigate new varieties with respect to their agronomic performance and suitability for the production of cold-pressed oil, 15 varieties of spring flax were tested in the years 2005-2007 at one site. They were sown in small plots with four replicates and managed according the rules of Swiss organic farming.

Research paper thumbnail of Geeignete Kartoffelsorten vermindern Acrylamidbildung

Research paper thumbnail of Stimulation of Symbiotic N2 Fixation in Trifolium repens L. under Elevated Atmospheric pCO2 in a Grassland Ecosystem

Plant physiology

Symbiotic N2 fixation is one of the main processes that introduces N into terrestrial ecosystems.... more Symbiotic N2 fixation is one of the main processes that introduces N into terrestrial ecosystems. As such, it may be crucial for the sequestration of the extra C available in a world of continuously increasing atmospheric CO2 partial pressure (pCO2). The effect of elevated pCO2 (60 Pa) on symbiotic N2 fixation (15N-isotope dilution method) was investigated using Free-Air-CO2-Enrichment technology over a period of 3 years. Trifolium repens was cultivated either alone or together with Lolium perenne (a nonfixing reference crop) in mixed swards. Two different N fertilization levels and defoliation frequencies were applied. The total N yield increased consistently and the percentage of plant N derived from symbiotic N2 fixation increased significantly in T. repens under elevated pCO2. All additionally assimilated N was derived from symbiotic N2 fixation, not from the soil. In the mixtures exposed to elevated pCO2, an increased amount of symbiotically fixed N (+7.8, 8.2, and 6.2 g m-2 a-...

Research paper thumbnail of Nitrogen supply of new potato varieties cultivated in Switzerland

Nitrogen fertilization trials were conducted in Switzerland with potato cultivars Lady Felicia, D... more Nitrogen fertilization trials were conducted in Switzerland with potato cultivars Lady Felicia, Derby, Victoria, Innovator and Marlen in Changins (VD) and Reckenholz (ZH). N Mineral fertilizer treatments varied from 0 to 200 kg N/ha, applied in one to three dressings from plantation until complete soil covering by the plants. The cultivars tested responded similarly to the nitrogen supply. Yield of the tested varieties didn't significantly increase by nitrogen application higher than 80 kg N/ha in Reckenholz and 160 kg/ha in Changins. This gap can be explained by the difference in mineral nitrogen status of soils at plantation; N mineral content is generally higher in Reckenholz at the beginning of the growing season. Focusing on tuber size of cultivar Derby, the yield of commercial tubers (size 42,5 - 70 mm) did not appear significantly increasing with N fertilization higher than 80 kg N/ha in Changins. Derby seems to have good N use efficiency. Generally, nitrogen improved the...

Research paper thumbnail of Foci of Potato research

German: Die Europäische Gesellschaft für Kartoffelforschung (EAPR) hielt ihren 18. Dreijahreskong... more German: Die Europäische Gesellschaft für Kartoffelforschung (EAPR) hielt ihren 18. Dreijahreskongress in Oulu (Finnland) ab. In 13 Plenar-, 75 Sessionsvorträgen und 131 Posterbeiträgen informierten sich mehr als 300 Teilnehmende über neuste Erkenntnisse in der Kartoffelforschung. Die Kartoffel, als drittwichtigste Kulturpflanze wird für die Versorgungssicherheit der Menschheit immer bedeutender. Starke Umwelteinflüsse bewirken grosse Ertragsschwankungen, deshalb sind insbesondere bessere Kenntnisse der Wasser- und Nährstoffeffizienz notwendig und das universitäre Interesse an der Kartoffel steigt stetig an. French: La Société européenne pour la recherche sur la pomme de terre (EAPR) a tenu son 18e congrès triennal à Oulu (Finlande). Quelque 300 participants ont pu s’informer sur les connaissances les plus récentes au sujet de la pomme de terre à l’occasion de 13 conférences plénières, 75 exposés répartis en sections spécialisés et 131 contributions présentées sous forme de posters. ...

Research paper thumbnail of Reaction of newly registered potato varieties to different nitrogen supplies

In 2008 and 2009, in field trials at the Changins-Nyon (Vaud canton) and Zurich-Reckenholz sites,... more In 2008 and 2009, in field trials at the Changins-Nyon (Vaud canton) and Zurich-Reckenholz sites, respectively, the two research stations of Agroscope Changins-Wädenswil ACW and Agroscope Reckenholz-Tänikon ART investigated the varietyspecific nitrogen (N) requirement of the potato varieties Gourmandine, Jelly, Laura and Lady Jo (the latter at Changins only). The N levels varied from 0 to 200 kg N per hectare. All varieties reacted to the increasing N supply with a higher gross- and marketable yield. From an N-application level of 120 kg/ha onwards, however, no significant surplus yields were demonstrated. The Gourmandine variety produced significantly higher gross- and marketable yields than Jelly and Laura. The higher the N supply, the lower the starch content of the tubers. Tubers from plants fertilised with N tended to exhibit a slightly higher brushing susceptibility than those from the non-fertilised treatment. Crisps made from the tubers of non-fertilised plants were slightly...

Research paper thumbnail of Susceptibility of newly bred potato cultivars to black dot and silver scurf

Introduction In Switzerland, the fresh consumption market washes a large part of the potatoes for... more Introduction In Switzerland, the fresh consumption market washes a large part of the potatoes for better display in the shops. Newly bred cultivars with beautiful presentation have a delicate skin, susceptible to many skin diseases. Among those, black dot (Colletotrichum coccodes) and silver scurf (Helminthosporium solani) have an important impact on tubers quality. They contribute to visual deterioration and weight loss during storage [1, 2]. The distribution of these two diseases in seed tubers and in the soil is very large in Europe [3]. The pathogens symptoms increase first in the soil, after harvest, during the conservation and after washing and packing process. The symptoms can quickly evolve when the conditions are favorable to diseases development [3, 4]. Material and Methods Each year in Switzerland, 20 to 25 newly bred potato cultivars, mainly from European breeders, are tested in four locations under field conditions. Each variety is tested for at least two consecutive ye...

Research paper thumbnail of Powdery scab resistance: An assessment of genotype x environment effect

Research paper thumbnail of Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield of Trifolium repens and Lolium perenne

... 1997, 18 (3), 277-284 Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield... more ... 1997, 18 (3), 277-284 Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield of Trifolium repens and Lolium perenne Thomas Hebeisen, Andreas ... L~SCHER A., HEBEISEN T., ZANETTI S., HARTWIG UA, BLUM H., HENDREY RG &NOSBERGER J., 1996. ...

Research paper thumbnail of Stimulation of Symbiotic N Fixation in

Research paper thumbnail of Differences between Legumes and Nonlegumes of Permanent Grassland in Their Responses to Free-Air Carbon Dioxide Enrichment: Its Effect on Competition in a Multispecies Mixture

Carbon Dioxide, Populations, and Communities, 1996

Plant growth is generally stimulated by an increase in atmospheric C02 concentration, with the av... more Plant growth is generally stimulated by an increase in atmospheric C02 concentration, with the average increase for a doubling of the actual C02 concentration being approximately 30%(Kimball, 1983; Newton, 1991; Poorter, 1993). Clear differences between the growth ...

Research paper thumbnail of Symbiotic Nitrogen Fixation: One Key to Understand the Response of Temperate Grassland Ecosystems to Elevated CO2?

Carbon Dioxide, Populations, and Communities, 1996

... Ueli A. Hartwig, Silvia Zanetti, Thomas Hebeisen, Andreas Luscher, Marco Frehner, Bernt Fisch... more ... Ueli A. Hartwig, Silvia Zanetti, Thomas Hebeisen, Andreas Luscher, Marco Frehner, Bernt Fischer,Chris Van Kessel, George R. Hendrey, Herbert Blum, and ... feedback regulation is involved in such an adaptation (Parsons et al, 1993; Heim et al, 1993; Oti-Boateng and Silsbury ...

Research paper thumbnail of Assessment of the physiological vigour of new potato cultivars in Switzerland

Potato Research, 2001

Dormancy, incubation periods and physiological vigour or rusticity of new potato cultivars were d... more Dormancy, incubation periods and physiological vigour or rusticity of new potato cultivars were determined during the official cultivar assessment programme in Switzerland. A total of 60 cultivars were assessed, including the standards, Sirtema (early), Bintje (mid-early) and Eba (mid-late); Russet Burbank was re-examined. Large variation between cultivars was observed, from 2000 to 3400 day-degrees for dormancy and from 1900 to 3700 day-degrees for incubation periods, expressed as sums of cumulated temperatures above zero centigrade. Field trials with physiologically aged seed identified the physiological vigour or rusticity of the cultivars. Those with low vigour or low rusticity showed poor emergence and yield after prolonged sprouting periods. The lowest produced less than 10% of the yield of seed of optimum physiological age stored under standard conditions. However, some high vigour or very rustic cultivars produced 100% of their potential yield. There was no relationship between earliness and physiological vigour. Vigour is very useful to farmers because it indicates those cultivars that are sensitive to warm storage or long sprouting periods and desprouting before planting.

Research paper thumbnail of Source-sink relations in Lolium perenne L. as reflected by carbohydrate concentrations in leaves and pseudo-stems during regrowth in a free air carbon dioxide enrichment (FACE) experiment*

Plant, Cell and Environment, 1997

Research paper thumbnail of Powdery scab resistance in Solanum tuberosum: an assessment of cultivar × environment effect

Plant Pathology, 2012

ABSTRACT Powdery scab of potato caused by Spongospora subterranea is one of the main disease prob... more ABSTRACT Powdery scab of potato caused by Spongospora subterranea is one of the main disease problems in many potato production regions of the world. However, no efficient and economically sound control method is currently available. Host resistance will be a key component of the integrated management of powdery scab, but there are discrepancies in published powdery scab resistance ratings of cultivars between countries. In order to identify the main factors causing such discrepancies, 10 reference cultivars thought to have a range of susceptibility to powdery scab and potato mop‐top virus were cropped over 4 years in four to six locations across Europe and disease levels on roots and tubers were assessed using standardized scoring scales. Soil contamination was tested using real‐time PCR and ELISA. The cultivars performed as expected according to previous characterization, with one exception. No relationship was found between tuber and root susceptibility. Assessment of powdery scab symptoms 1 month before harvest gave results comparable to those assessed 2 months after harvest. Neither real‐time PCR nor ELISA soil test results were closely related to disease index data. The field trial results indicate that different scoring methods are the main factor for the discrepancy in resistance ratings, and that environmental conditions and/or soil inoculum level play a minor role. Furthermore, there was either no difference between the pathogen populations in each location or the resistance of most of the cultivars is polygenic.

Research paper thumbnail of Does nitrogen nutrition restrict the CO 2 response of fertile grassland lacking legumes?

Oecologia, 1997

The extent of the response of plant growth to atmospheric CO2 enrichment depends on the availabil... more The extent of the response of plant growth to atmospheric CO2 enrichment depends on the availability of resources other than CO2. An important growth-limiting resource under field conditions is nitrogen (N). N may, therefore, influence the CO2 response of plants. The effect of elevated CO2 (60 Pa) partial pressure (pCO2) on the N nutrition of field-grown Lolium perenne swards, cultivated

Research paper thumbnail of The effects of elevated CO2 concentrations on the root growth of Lolium perenne and Trifolium repens grown in a FACE* system

Global Change Biology, 1995

Page 1. Global Change Biology (1995) 1, 361-371 The effects of elevated CO2 concentrations on the... more Page 1. Global Change Biology (1995) 1, 361-371 The effects of elevated CO2 concentrations on the root growth of Lolium perenne and Trifolium repens grown in a FACE* system MARJAN JONGEN', MIKE B. JONES\ THOMAS ...

Research paper thumbnail of Actualités de la recherche sur la pomme de terre

Recherche Agronomique Suisse, 2012

Research paper thumbnail of Essais variétaux et culturaux sur le pavot d'hiver

Recherche Agronomique Suisse, 2014

Research paper thumbnail of Liste suisse des variétés de pommes de terre 2010

Revue Suisse D Agriculture, 2009

Research paper thumbnail of Eignung von neuen Sommerölleinsorten für den Ökolandbau im Schweizer Mittelland

Oil flax was cropped in Switzerland in former times but seldom today. To investigate new varietie... more Oil flax was cropped in Switzerland in former times but seldom today. To investigate new varieties with respect to their agronomic performance and suitability for the production of cold-pressed oil, 15 varieties of spring flax were tested in the years 2005-2007 at one site. They were sown in small plots with four replicates and managed according the rules of Swiss organic farming.

Research paper thumbnail of Geeignete Kartoffelsorten vermindern Acrylamidbildung

Research paper thumbnail of Stimulation of Symbiotic N2 Fixation in Trifolium repens L. under Elevated Atmospheric pCO2 in a Grassland Ecosystem

Plant physiology

Symbiotic N2 fixation is one of the main processes that introduces N into terrestrial ecosystems.... more Symbiotic N2 fixation is one of the main processes that introduces N into terrestrial ecosystems. As such, it may be crucial for the sequestration of the extra C available in a world of continuously increasing atmospheric CO2 partial pressure (pCO2). The effect of elevated pCO2 (60 Pa) on symbiotic N2 fixation (15N-isotope dilution method) was investigated using Free-Air-CO2-Enrichment technology over a period of 3 years. Trifolium repens was cultivated either alone or together with Lolium perenne (a nonfixing reference crop) in mixed swards. Two different N fertilization levels and defoliation frequencies were applied. The total N yield increased consistently and the percentage of plant N derived from symbiotic N2 fixation increased significantly in T. repens under elevated pCO2. All additionally assimilated N was derived from symbiotic N2 fixation, not from the soil. In the mixtures exposed to elevated pCO2, an increased amount of symbiotically fixed N (+7.8, 8.2, and 6.2 g m-2 a-...

Research paper thumbnail of Nitrogen supply of new potato varieties cultivated in Switzerland

Nitrogen fertilization trials were conducted in Switzerland with potato cultivars Lady Felicia, D... more Nitrogen fertilization trials were conducted in Switzerland with potato cultivars Lady Felicia, Derby, Victoria, Innovator and Marlen in Changins (VD) and Reckenholz (ZH). N Mineral fertilizer treatments varied from 0 to 200 kg N/ha, applied in one to three dressings from plantation until complete soil covering by the plants. The cultivars tested responded similarly to the nitrogen supply. Yield of the tested varieties didn't significantly increase by nitrogen application higher than 80 kg N/ha in Reckenholz and 160 kg/ha in Changins. This gap can be explained by the difference in mineral nitrogen status of soils at plantation; N mineral content is generally higher in Reckenholz at the beginning of the growing season. Focusing on tuber size of cultivar Derby, the yield of commercial tubers (size 42,5 - 70 mm) did not appear significantly increasing with N fertilization higher than 80 kg N/ha in Changins. Derby seems to have good N use efficiency. Generally, nitrogen improved the...

Research paper thumbnail of Foci of Potato research

German: Die Europäische Gesellschaft für Kartoffelforschung (EAPR) hielt ihren 18. Dreijahreskong... more German: Die Europäische Gesellschaft für Kartoffelforschung (EAPR) hielt ihren 18. Dreijahreskongress in Oulu (Finnland) ab. In 13 Plenar-, 75 Sessionsvorträgen und 131 Posterbeiträgen informierten sich mehr als 300 Teilnehmende über neuste Erkenntnisse in der Kartoffelforschung. Die Kartoffel, als drittwichtigste Kulturpflanze wird für die Versorgungssicherheit der Menschheit immer bedeutender. Starke Umwelteinflüsse bewirken grosse Ertragsschwankungen, deshalb sind insbesondere bessere Kenntnisse der Wasser- und Nährstoffeffizienz notwendig und das universitäre Interesse an der Kartoffel steigt stetig an. French: La Société européenne pour la recherche sur la pomme de terre (EAPR) a tenu son 18e congrès triennal à Oulu (Finlande). Quelque 300 participants ont pu s’informer sur les connaissances les plus récentes au sujet de la pomme de terre à l’occasion de 13 conférences plénières, 75 exposés répartis en sections spécialisés et 131 contributions présentées sous forme de posters. ...

Research paper thumbnail of Reaction of newly registered potato varieties to different nitrogen supplies

In 2008 and 2009, in field trials at the Changins-Nyon (Vaud canton) and Zurich-Reckenholz sites,... more In 2008 and 2009, in field trials at the Changins-Nyon (Vaud canton) and Zurich-Reckenholz sites, respectively, the two research stations of Agroscope Changins-Wädenswil ACW and Agroscope Reckenholz-Tänikon ART investigated the varietyspecific nitrogen (N) requirement of the potato varieties Gourmandine, Jelly, Laura and Lady Jo (the latter at Changins only). The N levels varied from 0 to 200 kg N per hectare. All varieties reacted to the increasing N supply with a higher gross- and marketable yield. From an N-application level of 120 kg/ha onwards, however, no significant surplus yields were demonstrated. The Gourmandine variety produced significantly higher gross- and marketable yields than Jelly and Laura. The higher the N supply, the lower the starch content of the tubers. Tubers from plants fertilised with N tended to exhibit a slightly higher brushing susceptibility than those from the non-fertilised treatment. Crisps made from the tubers of non-fertilised plants were slightly...

Research paper thumbnail of Susceptibility of newly bred potato cultivars to black dot and silver scurf

Introduction In Switzerland, the fresh consumption market washes a large part of the potatoes for... more Introduction In Switzerland, the fresh consumption market washes a large part of the potatoes for better display in the shops. Newly bred cultivars with beautiful presentation have a delicate skin, susceptible to many skin diseases. Among those, black dot (Colletotrichum coccodes) and silver scurf (Helminthosporium solani) have an important impact on tubers quality. They contribute to visual deterioration and weight loss during storage [1, 2]. The distribution of these two diseases in seed tubers and in the soil is very large in Europe [3]. The pathogens symptoms increase first in the soil, after harvest, during the conservation and after washing and packing process. The symptoms can quickly evolve when the conditions are favorable to diseases development [3, 4]. Material and Methods Each year in Switzerland, 20 to 25 newly bred potato cultivars, mainly from European breeders, are tested in four locations under field conditions. Each variety is tested for at least two consecutive ye...

Research paper thumbnail of Powdery scab resistance: An assessment of genotype x environment effect

Research paper thumbnail of Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield of Trifolium repens and Lolium perenne

... 1997, 18 (3), 277-284 Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield... more ... 1997, 18 (3), 277-284 Effects of elevated atmospheric CO2 and nitrogen fertilisation on yield of Trifolium repens and Lolium perenne Thomas Hebeisen, Andreas ... L~SCHER A., HEBEISEN T., ZANETTI S., HARTWIG UA, BLUM H., HENDREY RG &NOSBERGER J., 1996. ...

Research paper thumbnail of Stimulation of Symbiotic N Fixation in

Research paper thumbnail of Differences between Legumes and Nonlegumes of Permanent Grassland in Their Responses to Free-Air Carbon Dioxide Enrichment: Its Effect on Competition in a Multispecies Mixture

Carbon Dioxide, Populations, and Communities, 1996

Plant growth is generally stimulated by an increase in atmospheric C02 concentration, with the av... more Plant growth is generally stimulated by an increase in atmospheric C02 concentration, with the average increase for a doubling of the actual C02 concentration being approximately 30%(Kimball, 1983; Newton, 1991; Poorter, 1993). Clear differences between the growth ...

Research paper thumbnail of Symbiotic Nitrogen Fixation: One Key to Understand the Response of Temperate Grassland Ecosystems to Elevated CO2?

Carbon Dioxide, Populations, and Communities, 1996

... Ueli A. Hartwig, Silvia Zanetti, Thomas Hebeisen, Andreas Luscher, Marco Frehner, Bernt Fisch... more ... Ueli A. Hartwig, Silvia Zanetti, Thomas Hebeisen, Andreas Luscher, Marco Frehner, Bernt Fischer,Chris Van Kessel, George R. Hendrey, Herbert Blum, and ... feedback regulation is involved in such an adaptation (Parsons et al, 1993; Heim et al, 1993; Oti-Boateng and Silsbury ...

Research paper thumbnail of Assessment of the physiological vigour of new potato cultivars in Switzerland

Potato Research, 2001

Dormancy, incubation periods and physiological vigour or rusticity of new potato cultivars were d... more Dormancy, incubation periods and physiological vigour or rusticity of new potato cultivars were determined during the official cultivar assessment programme in Switzerland. A total of 60 cultivars were assessed, including the standards, Sirtema (early), Bintje (mid-early) and Eba (mid-late); Russet Burbank was re-examined. Large variation between cultivars was observed, from 2000 to 3400 day-degrees for dormancy and from 1900 to 3700 day-degrees for incubation periods, expressed as sums of cumulated temperatures above zero centigrade. Field trials with physiologically aged seed identified the physiological vigour or rusticity of the cultivars. Those with low vigour or low rusticity showed poor emergence and yield after prolonged sprouting periods. The lowest produced less than 10% of the yield of seed of optimum physiological age stored under standard conditions. However, some high vigour or very rustic cultivars produced 100% of their potential yield. There was no relationship between earliness and physiological vigour. Vigour is very useful to farmers because it indicates those cultivars that are sensitive to warm storage or long sprouting periods and desprouting before planting.

Research paper thumbnail of Source-sink relations in Lolium perenne L. as reflected by carbohydrate concentrations in leaves and pseudo-stems during regrowth in a free air carbon dioxide enrichment (FACE) experiment*

Plant, Cell and Environment, 1997

Research paper thumbnail of Powdery scab resistance in Solanum tuberosum: an assessment of cultivar × environment effect

Plant Pathology, 2012

ABSTRACT Powdery scab of potato caused by Spongospora subterranea is one of the main disease prob... more ABSTRACT Powdery scab of potato caused by Spongospora subterranea is one of the main disease problems in many potato production regions of the world. However, no efficient and economically sound control method is currently available. Host resistance will be a key component of the integrated management of powdery scab, but there are discrepancies in published powdery scab resistance ratings of cultivars between countries. In order to identify the main factors causing such discrepancies, 10 reference cultivars thought to have a range of susceptibility to powdery scab and potato mop‐top virus were cropped over 4 years in four to six locations across Europe and disease levels on roots and tubers were assessed using standardized scoring scales. Soil contamination was tested using real‐time PCR and ELISA. The cultivars performed as expected according to previous characterization, with one exception. No relationship was found between tuber and root susceptibility. Assessment of powdery scab symptoms 1 month before harvest gave results comparable to those assessed 2 months after harvest. Neither real‐time PCR nor ELISA soil test results were closely related to disease index data. The field trial results indicate that different scoring methods are the main factor for the discrepancy in resistance ratings, and that environmental conditions and/or soil inoculum level play a minor role. Furthermore, there was either no difference between the pathogen populations in each location or the resistance of most of the cultivars is polygenic.

Research paper thumbnail of Does nitrogen nutrition restrict the CO 2 response of fertile grassland lacking legumes?

Oecologia, 1997

The extent of the response of plant growth to atmospheric CO2 enrichment depends on the availabil... more The extent of the response of plant growth to atmospheric CO2 enrichment depends on the availability of resources other than CO2. An important growth-limiting resource under field conditions is nitrogen (N). N may, therefore, influence the CO2 response of plants. The effect of elevated CO2 (60 Pa) partial pressure (pCO2) on the N nutrition of field-grown Lolium perenne swards, cultivated

Research paper thumbnail of The effects of elevated CO2 concentrations on the root growth of Lolium perenne and Trifolium repens grown in a FACE* system

Global Change Biology, 1995

Page 1. Global Change Biology (1995) 1, 361-371 The effects of elevated CO2 concentrations on the... more Page 1. Global Change Biology (1995) 1, 361-371 The effects of elevated CO2 concentrations on the root growth of Lolium perenne and Trifolium repens grown in a FACE* system MARJAN JONGEN', MIKE B. JONES\ THOMAS ...