Differences in Wheat Cultivar Response to N Supply. I: Differences in Grain Yield Formation
| Autor: | G. Fischbeck, Florian Diekmann |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Journal of Agronomy and Crop Science. 191:351-361 |
| ISSN: | 1439-037X 0931-2250 |
| DOI: | 10.1111/j.1439-037x.2005.00165.x |
| Popis: | Two-year field trials with winter wheat cultivars Batis and Toronto were conducted in Southern Bavaria, Germany, to investigate the possible causes of cultivar differences in response to N supply varying in total amount and time of application. Cultivar-related differences in grain yields were observed in treatments with low and medium N supply. High doses of N supply resulted in grain yield adjustment or grain yield advantage for cv. Toronto. The results of this study revealed a consistent, genotypic pattern in response to N fertilization in spite of strong seasonal effects. Systematic modifications in canopy growth rates in response to N supply were of particular relevance and a main factor for differences in tillering intensity resulting in modified stand densities. In the present study, cultivar differences in spike development and interactions with N supply related more to abortion than to initiation processes for number of spikelets and number of flowers per spikelet. High grain density (grains per m 2 ) of cv. Toronto was evident during reproduction stages even under conditions of medium N supply. However, decreased growth rates during the later part of grain filling in combination with low 1000 grain weight, which was barely modified by N fertilization, allowed only partial utilization of this potential. It is assumed that sink limitations were of particular relevance for grain yield development in cv. Toronto, while cv. Batis combined a less intense response to N supply with more stability in the development of grain yield components. |
| Databáze: | OpenAIRE |
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