Determining basic growth parameters of three Chinese cabbage (Brassica campestris L. ssp. Pekinensis (Lour) Olsson) cultivars for integration into the DSSAT cropping model

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Autoren

Feike, T., Pfenning, J., Zuehlke, G., Graeff-Hoenninger, S., Claupein, W.

Erscheinungsjahr

2008

Tagungsname

ISCMDS 2008: International Symposium on Crop Modelling and Decision

Tagungsort

Nanjing (China)

Tagungsdatum

19.04.2008

In the North China Plain a rapid increase in vegetable production can be observed. Vegetables demand higher inputs compared to grain crops and thus severely endanger sustainability. Crop models like the DSSAT cropping systems model proved to be useful tools in developing improved water and fertilizer saving production systems. Several vegetable crops e.g. tomato, bell pepper and cabbage can already be simulated in DSSAT. Chinese cabbage (Brassica campestris L. ssp. Pekinensis) as the most important vegetable crop of the North China Plain (NCP) is not yet included. In this study basic growth parameters of three Chinese cabbage cultivars were determined for subsequent integration of Chinese cabbage as a new crop into the DSSAT model.

The experiment was conducted at University of Hohenheim, Germany, in autumn 2007. Three cultivars, namely “Qiulu 75”, “Gailing Qingza No.3” (both Chinese cultivars) and “Kasumi” (German cultivar) were grown simultaneously under four different temperature regimes, with an average temperature of about 16°C, 12°C, 6°C and 4°C. Fertilizer and water supply were kept at optimum. All growth parameters e.g. number of leaves, height and diameter of plants, leaf area and total N per plant were destructively measured in intervals of 10 to 20 days. The three cultivars show significantly different responses to the different temperature regimes. Two cultivars showed strongly increased leaf area and number of leaves under increased temperature, whereas one cultivar produced most leaf area and number of leaves under 12°C average temperature. Additionally significant variation in minimum growth temperature and degree of frost resistance could be observed.

This experiment was a preliminary study. Its findings will be completed by data available in literature and used to change cultivar, species and ecotype files of the existing cabbage (Brassica oleracea) model. The model will be tested using experiment data of Beijing region from 1999 and 2000.