Is time to flowering in wheat and barley influenced by nitrogen? a critical appraisal of recent published reports
The literature includes a number of reports, relating to both crop and non-crop species, showing conflicting responses of developmental plasticity to nitrogen availability. We reviewed 1130 papers published from 1990 to 2010 drawn from 14 agriculture-themed journals and conducted a critical appraisal of the effects of fertiliser nitrogen on time to heading or anthesis in barley and wheat, species for which there is a good deal of data. Features of the analysis were the use of relative responses [respect to unfertilised controls] of yield and time to flowering to nitrogen as a proxy for crop nitrogen status and developmental differences, respectively, and the standardisation of the start point for calculating time [in both calendar and thermal units] to flowering in autumn-sown winter cultivars to March 1 [N Hemisphere]. The resulting database [180 cases] covered a broad range of unfertilised crop yields [1-8Mgha-1], and times to flowering [47-168 days]. In very few cases [19 out of 118], the relative time to flowering in fertilised crops differed by more than 5 percent from those of unfertilised crops across a range of yield responses to fertiliser nitrogen from negligible to three-fold. Currently available evidence does not provide solid support to a plastic response of time to flowering to nitrogen in these two species.
| Main Authors: | , , |
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| Format: | Texto biblioteca |
| Language: | spa |
| Subjects: | AGRONOMY, BARLEY, BIOLOGICAL DEVELOPMENT, CROP YIELD, CULTIVAR, DATABASE, DEVELOPMENTAL PLASTICITY, FERTILIZER APPLICATION, FLOWERING, HORDEUM VULGARE, NITROGEN, NUTRIENT AVAILABILITY, PHENOTYPIC PLASTICITY, TRITICUM AESTIVUM, TRITICUM DURUM, WHEAT, YIELD RESPONSE, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=47023 |
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| Summary: | The literature includes a number of reports, relating to both crop and non-crop species, showing conflicting responses of developmental plasticity to nitrogen availability. We reviewed 1130 papers published from 1990 to 2010 drawn from 14 agriculture-themed journals and conducted a critical appraisal of the effects of fertiliser nitrogen on time to heading or anthesis in barley and wheat, species for which there is a good deal of data. Features of the analysis were the use of relative responses [respect to unfertilised controls] of yield and time to flowering to nitrogen as a proxy for crop nitrogen status and developmental differences, respectively, and the standardisation of the start point for calculating time [in both calendar and thermal units] to flowering in autumn-sown winter cultivars to March 1 [N Hemisphere]. The resulting database [180 cases] covered a broad range of unfertilised crop yields [1-8Mgha-1], and times to flowering [47-168 days]. In very few cases [19 out of 118], the relative time to flowering in fertilised crops differed by more than 5 percent from those of unfertilised crops across a range of yield responses to fertiliser nitrogen from negligible to three-fold. Currently available evidence does not provide solid support to a plastic response of time to flowering to nitrogen in these two species. |
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