The impact of post-anthesis nitrogen and water availability on yield formation of winter wheat

Autor: Mehdi Joudi, F. Vazin, Ahad Madani, A. H. Makarem
Rok vydání: 2012
Předmět:
Zdroj: Plant, Soil and Environment. 58:9-14
ISSN: 1805-9368
1214-1178
DOI: 10.17221/299/2011-pse
Popis: The effects of irrigation regimes (full irrigation and water-withholding at anthesis) and post-anthesis nitrogen sup plies (LN: 0, MN: 20 and HN: 40 kg N/ha) on grain yield and its components in winter wheat were studied, with attention to biomass gain by assimilation and its loss by respiration. Fully-irrigated wheat responded to N fertilization with increased grain number (GN) and decreased grain weight (GW) and achieved similar grain yields (5.2 to 5.5 t/ha) at different N supplies. However, drought-stressed wheat responded to N with higher GN without sig nificant changes in GW, and achieved higher grain yields (2.7 vs. 3.3 t/ha) with HN compared to LN. Net assimila tion rates during grain filling (NARg) increased with increasing post-anthesis N fertilization for drought-stressed wheat (NARg: 3.8 and 4.5 g/m/day for LN and HN). Apparent whole-plant respiration (R A ) was not influenced by increased post-anthesis N fertilizer. Thus, in drought-stressed wheat, the total biomass and straw yield at maturity were increased by increasing N supply. These results suggest that high N supply at anthesis satisfied the grains’ in creased demand for N by increasing post-floral assimilation, and the surplus assimilates not only compensated for the low-N-induced biomass loss by respiration but may also have increased the straw yield.
Databáze: OpenAIRE
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