Effects of nitrogen deficiencies on autumnal growth of oilseed rape

Several field experiments were carried out to define the effects of temporary N deficiency in autumn on the growth and yield of winter oilseed rape. N deficiencies are described in terms of nitrogen nutrition index (NNI) i.e. methodologies of Lemaire et al. (Proceedings of the XVI International Gras...

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Bibliographic Details
Published in:European journal of agronomy 2002-07, Vol.17 (1), p.11-28
Main Authors: Colnenne, C, Meynard, J.M, Roche, R, Reau, R
Format: Article
Language:English
Subjects:
Agricultural sciences
Agronomy. Soil science and plant productions
Biological and medical sciences
Deficiencies. Phytotoxicity of elements. Salinity
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
LAI
Life Sciences
Nitrogen
NNI
Rapeseed
RUE
Shoot and tap root biomass
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Temporary deficiencies
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Summary:Several field experiments were carried out to define the effects of temporary N deficiency in autumn on the growth and yield of winter oilseed rape. N deficiencies are described in terms of nitrogen nutrition index (NNI) i.e. methodologies of Lemaire et al. (Proceedings of the XVI International Grassland Congress, Nice, France, 1989, p. 179) and Lemaire and Gastal (In: G. Lemaire (Ed.), Springer, Berlin, Diagnosis of the Nitrogen Status in Crops, 1997, p. 3). The growth components analysed were shoot and tap root biomass, leaf area index (LAI) and radiation use efficiency (RUE). In all the experimental conditions, N deficiencies were severe (NNI near 0.60) and had significant effects on all growth components. These growth variables and NNI were fitted by various functions. The effects of N stress on winter oilseed rape are discussed and compared to another crop. Despite severe autumn N deficiencies, no difference in yield was apparent because these deficiencies probably allow all the time enough growth in autumn to ensure sufficient regrowth in spring.
ISSN:1161-0301
1873-7331
DOI:10.1016/S1161-0301(01)00140-X