Remobilization of dry matter in wheat: effects of nitrogen application and post-anthesis water deficit during grain filling

Autor:	A. Bahrani, A Ayneh Band, Z Tahmasebi Sarvestani, GH Moafpourian, H. Heidari Sharif Abad
Rok vydání:	2011
Předmět:	Mediterranean climate Chemistry chemistry.chemical_element Horticulture engineering.material Grain filling Nitrogen Agronomy Anthesis Dry weight engineering Dry matter Fertilizer Cultivar Agronomy and Crop Science
Zdroj:	New Zealand Journal of Crop and Horticultural Science. 39:279-293
ISSN:	1175-8783 0114-0671
DOI:	10.1080/01140671.2011.599397
Popis:	Pre-anthesis stored dry matter in wheat (Triticum aestivum L.) is important in a Mediterranean climate because grain filling greatly depends on the remobilization of pre-anthesis assimilates. A water deficit at the post-anthesis stage may increase the dry matter stored before anthesis. This field study assessed the effects of post-anthesis water deficit and the application of nitrogen (N) fertilizer on three wheat cultivars. Data collected over 2 years showed that, in wheat with a post-anthesis water deficit (WD), dry matter remobilization efficiency reached its maximum (29%) at 80 kg N ha−1, but further additions of N decreased it. The contribution of remobilized dry matter to a grain ranged from 7% to 23% of the grain's dry weight and, in WD grain, was 78% more than that of well-watered (WW) grain. Grain from plots on which fertilizer had been applied had a lower proportion of remobilized dry matter than did grain from unfertilized plots. For grain from adequately fertilized treatments, limited...
Databáze:	OpenAIRE
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