Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Dennis Friesen"'
Autor:
Nilupa S. Gunaratna, Hugo De Groote, Monica Fisher, E. G. Kebebe, Frank Mmbando, Dennis Friesen
Publikováno v:
Food Security. 8:1101-1121
Biofortified crops can be promoted with extension strategies based on their agronomic qualities, nutritional qualities, or both, but the effectiveness of these different strategies has so far not been studied. Since 2003, quality protein maize (QPM)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b7d70efe48d9a949e4f36eeb64b937f6
https://doi.org/10.1007/s12571-016-0621-7
https://doi.org/10.1007/s12571-016-0621-7
Publikováno v:
Field Crops Research. 153:86-93
Prediction of hybrid performance from inbred lines per se is crucial in targeted improvement of new traits such as stover fodder quality. The present study investigated the trend in variability and association between food and fodder traits in inbred
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::513087ec0792982fb76cd083acb1f38f
https://doi.org/10.1016/j.fcr.2013.02.008
https://doi.org/10.1016/j.fcr.2013.02.008
Autor:
Berhanu Tadesse Ertiro, Dennis Friesen, Mosisa Worku, Michael Blümmel, Demissew Abakemal, Demewoz Negera, Kheri Kitenge, S. Twumasi-Afriyie
Publikováno v:
Field Crops Research. 153:79-85
Maize stover left after grain harvest constitutes an important source for livestock feed in most parts of East Africa, particularly during the dry season. In spite of its wide use and greater importance, breeding programs have given little attention
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d414c0cb85ae7efddd69e4580315786
https://doi.org/10.1016/j.fcr.2012.12.019
https://doi.org/10.1016/j.fcr.2012.12.019
Autor:
Dennis Friesen, Gunda Schulte auf’m Erley, Walter J. Horst, Mosisa Worku, Marianne Bänziger, Alpha Diallo
Publikováno v:
Field Crops Research. 130:57-67
Development of more nitrogen (N) efficient maize (Zea mays L.) varieties capable of producing higher maize grain yields under conditions of low soil N supply could improve the livelihoods of smallholder subsistence farmers in sub-Saharan Africa who c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0afabbb2f1d7b7d1209c67d47be83e91
https://doi.org/10.1016/j.fcr.2012.02.015
https://doi.org/10.1016/j.fcr.2012.02.015
Autor:
L. Wangare, Haron Karaya, Dennis Friesen, Fred Kanampiu, Martins Odendo, A. Diallo, H. De Groote
Publikováno v:
Agricultural Systems. 97:83-94
Striga is an obligate parasitic weed that attacks cereal crops in sub-Saharan Africa. In Western Kenya, it has been identified by farmers as their major pest problem in maize. A new technology, consisting of coating seed of imidazolinone resistant (I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ccafbe1930a7556b2e7a3e05a329871
https://doi.org/10.1016/j.agsy.2007.12.003
https://doi.org/10.1016/j.agsy.2007.12.003
Autor:
Alpha Diallo, Walter J. Horst, Dennis Friesen, Gunda Schulte auf’m Erley, Mosisa Worku, Marianne Bänziger
Publikováno v:
Crop Science. 47:519-528
Maize cultivars with improved grain yields under nitrogen (N) stress are desirable for sub-Saharan African maize growing environments. This study assesses N uptake, N utilization, and the genotype x environment (G x E) interaction of 16 tropical maiz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41e69d09b3503a24eea389655da411f7
https://doi.org/10.2135/cropsci2005.05.0070
https://doi.org/10.2135/cropsci2005.05.0070
Publikováno v:
European Journal of Soil Science. 54:605-616
Use of isotope methods to measure the availability of phosphorus (P) in soils that are well supplied with P is well established. We have evaluated such methods for acid tropical soils with very small P contents, which are less well studied. The isoto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0764d03c25658937a1b1795219d4b5c1
https://doi.org/10.1046/j.1365-2389.2003.00542.x
https://doi.org/10.1046/j.1365-2389.2003.00542.x
Autor:
Dennis Friesen, Cornel Massawe, Lawrence Jasi, Jonathan Gressel, V. H. Kabambe, Fred Kanampiu, Joel K. Ransom
Publikováno v:
Crop Protection. 22:697-706
Plant parasitic Striga (witchweed) species have not been controlled in susceptible host crops prior to exerting damage. High dose, localized herbicide levels can be applied on or near maize seed bearing acetolactate synthase (ALS) target-site resista
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22f51f3e2e4dcfef7c6bd3e6cd93ddc4
https://doi.org/10.1016/s0261-2194(03)00007-3
https://doi.org/10.1016/s0261-2194(03)00007-3
Publikováno v:
Agricultural Systems. 76:1157-1181
Phosphorus (P) is a limiting nutrient affecting crop yields in many regions of the world, in particular in areas with highly weathered acid soils and calcareous alkaline soils. Given the many factors associated with P behavior in a range of soil envi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30ee522928d15024cd96e0008a1250fd
https://doi.org/10.1016/s0308-521x(02)00082-3
https://doi.org/10.1016/s0308-521x(02)00082-3
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
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The objective of this study was to assess the effect of a native anecic species on phosphorus availability in an Oxisol characterised by a low chemical fertility. Experiments were carried out at Carimagua research station in a representative site of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7175f3bb52a4fb2809bff895d4da2068
https://doi.org/10.1016/s0038-0717(03)00090-7
https://doi.org/10.1016/s0038-0717(03)00090-7