Khuyen Bui Thi, De Bon Hubert, Tô Thi Thu Ha.
2002. Effect of doses nitrogen on choysum crop in Hanoi periurban areas and dertermination critical N dilution curve.
In : Résultats de recherches scientifiques et techniques sur les légumes, fleurs et fruits, période 2000-2002 [Titre traduit]. RIFAV
Titre vietnamien :
Résumé : A field experiment was conducted to determine the effect of doses N on yield and quality of chose in Gialam, Hanoi. Five nitrogen rates were compared to 0: 30; 60; 120; and 180 kg N/ha. The highest yield (fresh matter and dry matter) of choysum was obtained at 120 kg N/ha in both summer and winter season. Application over 120 kg N/ha, is at 180 kg N/ha was not significantly increase yield. Nitrat content increased according with N applied rates from 0 to 180 kg N/ha. Nitrat content for a given nitrogen application was higher in winter season than in summer season. A tentative critical N dilution curve has been set up for choysum crop; this curve is described by the following equation: Nc = 4,934 x DM-0.054 (R2 = 0,707). This curve has been validated over the range of shoot dry matter of 0,12-2,18 t/ha. For lower shoot biomass, this equation overestimated the critical nitrogen concentration. The validity of this curve needs to continue evaluating in different climates and cultivation conditions.
Classification Agris : F04 - Fertilisation
Auteurs et affiliations
- Khuyen Bui Thi, RIFAV (VNM)
- De Bon Hubert, CIRAD-FLHOR-PRH (VNM)
- Tô Thi Thu Ha, RIFAV (VNM)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/513712/)
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