Growth, yield and nitrogen use efficiency of dry-seeded rice as influenced by nitrogen and seed rates in Bangladesh

Ahmed, Sharif, Humphreys, Elizabeth, Salim, Muhammad and Chauhan, Bhagirath S. (2016) Growth, yield and nitrogen use efficiency of dry-seeded rice as influenced by nitrogen and seed rates in Bangladesh. Field Crops Research, 186 18-31. doi:10.1016/j.fcr.2015.11.001

Author Ahmed, Sharif
Humphreys, Elizabeth
Salim, Muhammad
Chauhan, Bhagirath S.
Title Growth, yield and nitrogen use efficiency of dry-seeded rice as influenced by nitrogen and seed rates in Bangladesh
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
Publication date 2016-02-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.fcr.2015.11.001
Open Access Status Not Open Access
Volume 186
Start page 18
End page 31
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
1111 Nutrition and Dietetics
Formatted abstract
The fertilizer N requirement of dry-seeded rice (DSR) grown with alternate wetting and drying (AWD) water management may differ from that of traditional puddled transplanted rice (PTR) grown under continuous flooding due to differences in N dynamics in the soil/water system and crop growth patterns. The effects of changing establishment method and water management on N fertilizer requirement may also vary between crops grown in the dry and rainy seasons. Therefore, field experiments were conducted over two years in both the boro (dry) and aman (wet) seasons in Bangladesh to evaluate the effects of N rate and seed rate on crop performance and N use efficiency. Four N rates were used in the boro (0, 100, 140, and 180kgha-1) and aman (0, 80, 120, and 160kgha-1) seasons, and five seed rates (20, 40, 60, 80, and 100kgha-1) were used in both seasons. There was a significant interaction between N rate and seed rate on grain yield of all crops. Maximum yield of all crops was achieved at the highest N rate with a seed rate of at least 40-60kgha-1, suggesting that DSR has a higher fertilizer N requirement than the recommended rate for PTR. However, there was lodging at physiological maturity of the aman crops at 20 and 40kgseedha-1 at the maximum N rate, but not at 60kgha-1, suggesting that at seed rates of 20-40kgha-1 a lower N rate than the maximum tested would be optimal. Agronomic fertilizer N use efficiency (15-20kggrainkg-1) and N recovery efficiency (35-40%) were low and comparable to the values reported in Asia for PTR, indicating the need for methods to improve fertilizer use efficiency of DSR. The boro crops sown in mid November suffered from cold damage, resulting in some seedling death in the first year, and substantial seedling death in the second year. In the second year, all boro sowings from mid November to mid January failed due to low temperature. The results suggest that dry seeding of boro rice in mid November is risky because of low temperature in December-January. However, delaying sowing to early February reduced yield due to high temperature during anthesis and low solar radiation during grain filling. Therefore, boro varieties with greater cold tolerance during the vegetative stage are needed to enable the switch from PTR to November-sown dry-seeded boro rice in the High Ganges River Floodplain of western Bangladesh.
Keyword Agronomic efficiency
BRRI dhan28
BRRI dhan49
Cold damage
Nitrogen uptake
Recovery efficiency
Sowing date
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 1 times in Scopus Article | Citations
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