Agronomic and Physiological Parameters of Genotypic Nitrogen Efficiency in Oilseed Rape (Brassica napus L.).

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Doç. Dr. ABDULLAH ULAŞ

Tez Türü: Doktora

Tezin Yürütüldüğü Kurum: Universitaet Hannover, Doğal Bilimler Fakültesi, Bitki Besleme Enstitüsü, Almanya

Tez Danışmanı: Prof. Dr. Walter J. Horst

Tezin Onay Tarihi: 2010

Tezin Dili: İngilizce

Desteklendiği Program: Diğer

Özet:

The objectives of the present study were: (1) to determine genotypic differences in N efficiency (seed yield at limiting N supply) and the importance of N uptake and N utilization efficiency (grain yield per unit N taken up) for genetic variation in seed yield under different levels of N supply, (2) to estimate the significance of root growth and morphology for genotypic differences in N efficiency, (3) to identify morphological and physiological leaf traits contributing to genotypic differences in N efficiency and (4) to quantify the relative importance of radiation interception and radiation use efficiency for crop growth rate. Different sets of cultivars and DH lines were evaluated in field experiments conducted in 1999/2000, 2000/2001 and 2001/2002 cropping periods at two experimental sites near Göttingen under three different levels of N supply (N0: soil mineral N, N1: 120 kg N ha^-1, N2: 240 kg N ha^-1).