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- Title
Nitrogen Accumulation and Translocation for Winter Wheat under Different Irrigation Regimes.
- Authors
Xu, Z. Z.; Yu, Z. W.; Wang, D.; Zhang, Y. L.
- Abstract
The translocation of pre-anthesis nitrogen to the grain is an important source for winter wheat. The relation between the nitrogen translocation and irrigation regime was studied in the field under a rain-proof trough shelter. Nitrogen (N) translocation amount, N translocation efficiency decreased with a decline in irrigation amount or by excessive irrigation. Compared with different organs, the leaf and stem had higher N translocation amounts, and contributions to grain for both cultivars – Jinan 17 and Lumai 21, indicating that stem also is a major N source for grain development. The contribution of pre-anthesis total above ground N to grain N ranged from 57 to 76 %, indicating the importance of pre-anthesis storage of N for achieving high grain N concentrations. Grain nitrogen and yield (kg ha−1) were positively and significantly correlated with the N translocation amounts and contributions, respectively, suggesting that the sink strength may be involved in the translocation of N from a vegetative organ to the grain. N harvest index (NHI) was significantly correlated with N translocation efficiency, suggesting that the latter is a prerequisite for increasing grain N and improving grain quality. The experiment showed that N translocation status is enhanced by better irrigation practices, but limited by severely deficient or excessive irrigation.
- Subjects
WINTER wheat; CROPS; NITROGEN; PLANT translocation; IRRIGATION; WATER in agriculture
- Publication
Journal of Agronomy & Crop Science, 2005, Vol 191, Issue 6, p439
- ISSN
0931-2250
- Publication type
Article
- DOI
10.1111/j.1439-037X.2005.00178.x