Výsledky vyhledávání

Nitrogen uptake efficiency by white cedar under different irrigation and fertilisation strategies on a sandy soil: model calculations

Autor: Ep Heuvelink, H. Challa, Marius Heinen, Annette Pronk

Publikováno v: Journal of Horticultural Science and Biotechnology, 82(3), 451-459
Journal of Horticultural Science and Biotechnology 82 (2007) 3

A combined conifer growth-soil water balance model was extended and parameterised to simulate the nitrogen (N) dynamics of a common nursery stock system [i.e., white cedar (Thuja occidentalis) grown for 2 years on a sandy soil]. The model was used to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa314b374baf5b8cf72dbb7440d71fa4
https://doi.org/10.1080/14620316.2007.11512258

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The Solar Greenhouse: state of the art in energy saving and sustainable energy supply

Autor: Silke Hemming, I. Verlodt, Th. Rieswijk, G.P.A. Bot, H. Challa, N.J. van de Braak, G. van Straten

Publikováno v: Acta Horticulturae, 691(2), 501-508
Proceedings of GreenSys2004: Sustainable Greenhouse Systems, Leuven, Belgium, 12-16 september 2004
Acta Horticulturae 691 (2005) 2

The objective of the solar greenhouse project was the development of a Dutch greenhouse system for high value crop production without the use of fossil fuels. The project was completed and the results are reported here. The main approach was to first

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::300ab38b504016b835b5773dfafee542
https://doi.org/10.17660/actahortic.2005.691.59

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Temperature integration and process-based humidity control in chrysanthemum

Autor: H. Challa, Oliver Körner

Publikováno v: Computers and Electronics in Agriculture 43 (2004) 1
Computers and Electronics in Agriculture, 43(1), 1-22

Simulations in the authors’ previous studies have shown that a modified temperature integration regime with a 6-day averaging period and increased set-point flexibility was able to reduce annual energy consumption by up to 9% as compared to a regul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d99416b67a9e2010e381a60baf7e422
https://doi.org/10.1016/j.compag.2003.08.003

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ENERGY SAVING CLIMATE CONTROL REGIME FOR CUT CHRYSANTHEMUM

Autor: O. Körner, H. Challa

Publikováno v: Acta Horticulturae. :489-496

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::34a0bf7926b65d1fadfdf1b2c9420300
https://doi.org/10.17660/actahortic.2004.633.61

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A simple method to estimate radiation interception by nursery stock conifers: a case study of eastern white cedar

Autor: J. Goudriaan, Annette Pronk, E.S.C. Stilma, H. Challa

Publikováno v: ResearcherID
NJAS Wageningen Journal of Life Sciences 51 (2003) 3
NJAS Wageningen Journal of Life Sciences, 51(3), 279-295

A simple method was developed to estimate the fraction radiation intercepted by small eastern white cedar plants ( Thuja occidentalis 'Brabant'). The method, which describes the crop canopy as rows of cuboids, was compared with methods used for estim

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acb17077f28f51437befab687f247b62
https://doi.org/10.1016/s1573-5214(03)80020-9

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MODELING TEMPERATURE EFFECTS ON CROP PHOTOSYNTHESIS AT HIGH RADIATION IN A SOLAR GREENHOUSE

Autor: R.J.C. van Ooteghem, O. Körner, H. Challa

Publikováno v: Acta Horticulturae (2003) 593
Acta Horticulturae, 137-144
ISSUE=593;STARTPAGE=137;ENDPAGE=144;ISSN=05677572;TITLE=Acta Horticulturae

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72b6f60bfe1847e90097fd4283e61943
https://doi.org/10.17660/actahortic.2002.593.17

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REFLECTIONS ABOUT RESEARCH ON SUPPLEMENTARY LIGHTING IN GREENHOUSE CULTIVATION

Autor: H. Challa

Publikováno v: Acta Horticulturae. :265-268

Some personal comments are given about research on supplementary lighting in horticulture. There is a rapid development in the use of supplementary lighting in horticultural practice. Generalisation is needed to share, transfer and apply the pertinen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4bbae9fb3faed39424f76969c0ad98c7
https://doi.org/10.17660/actahortic.2002.580.35

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A simulation study on the interactive effects of radiation and plant density on growth of cut chrysanthemum

Autor: H. Challa, Jeong Hyun Lee, Ep Heuvelink

Publikováno v: Acta Horticulturae 593 (2002)
Acta Horticulturae, 593, 151-157

In the present study, we used a photosynthesis-driven crop growth model to determine acceptable plant densities for cut chrysanthemum throughout the year at different intensities of supplementary light. Dry matter partitioning between leaves, stems,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dab498c868ddbf8329c19ffbdc1c4b38
https://doi.org/10.17660/actahortic.2002.593.19

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PHOTOSYNTHATES: MAINLY STORED AND YET LIMITING IN PROPAGATION OF ROSE CUTTINGS

Autor: U. van Meeteren, J.M. Costa, H. Challa, P.A. van de Pol

Publikováno v: Acta Horticulturae 547 (2001)
Acta Horticulturae, 547, 167-174

Leaves are essential in the propagation of roses by cuttings. However, about the underlying principles, there is no unequivocal opinion in the literature. We investigated the hypothesis that current photosynthesis would represent the dominating facto

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::271c757b279ed4a1cb2980a83d82ffc3
https://doi.org/10.17660/actahortic.2001.547.20

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