Modelling External Quality of Cut Chrysanthemum: Achievements and Limitations

Abstract

This INTRODUCTIONThe development of models on product quality has been an important and challenging issue in greenhouse crop simulation, over the last few years (Challa, 2002). Nevertheless, only few models for ornamental crops are available (Marcelis et al., 1998) and these are mainly focused on the growth and development, rather than on product quality (Gary et al., 1998). Lee (2002) developed and validated a photosynthesis-driven growth model, for the prediction of dry mass production in year-round cut chrysanthemum (CHRYSIMv1.0). Since the visual (external) quality aspects have a large influence on the selling price of chrysanthemum, this explanatory model could highly benefit from the incorporation of 'modules' to predict the main external quality aspects.To predict the main external quality aspects of cut chrysanthemum a good quantification and understanding of the effects of the above-ground growth conditions is needed. Carvalho and Heuvelink (2001) made an attempt to integrate the available knowledge on this topic. From their literature study it became clear that quality aspects were rarely the focus in studies on chrysanthemum. The information was widely spread and often a clear understanding of the processes behind a quality aspect was lacking, and the results could not easily be generalised. Furthermore, some contradictions were also found when comparing different studies. Part of these contradictions was possibly related to the use of different cultivars in different studies, but others needed additional research.

Farklı sulama programlarının krizantemin kalitesi üzerine etkileri

“…Bitkilerin bu işlemlerinin olumsuz etkilenmemesi için su stresi içinde bulunmamaları gerekir (Jones & Tardieu 1998;Peri et al 2003). Bu nedenle süs bitkilerinde büyüme süreci ve görsel kalite üzerine suyun etkilerinin belirlenmesi için su yönetimini optimize etmek önemli bir adımdır (Carvalho & Heuvelink 2004;Lin et al 2011). Krizantemde iklim koşulları (özellikle sıcaklık ve ışık) ve dikim sıklığı üzerine çok sayıda araştırma yapılmış olmakla birlikte suyun büyüme ve görsel kalite üzerine etkilerinin belirlenmesine yönelik olarak yürütülen araştırma sayısı sınırlıdır (Lin et al 2011).…”