Optimizing sowing management for short duration dry seeded aman rice on the High Ganges River floodplain of Bangladesh

Ahmed, Sharif, Humphreys, Elizabeth, Salim, Muhammad and Chauhan, Bhagirath S. (2014) Optimizing sowing management for short duration dry seeded aman rice on the High Ganges River floodplain of Bangladesh. Field Crops Research, 169 77-88. doi:10.1016/j.fcr.2014.09.009


Author Ahmed, Sharif
Humphreys, Elizabeth
Salim, Muhammad
Chauhan, Bhagirath S.
Title Optimizing sowing management for short duration dry seeded aman rice on the High Ganges River floodplain of Bangladesh
Formatted title
Optimizing sowing management for short duration dry seeded aman rice on the High Ganges River floodplain of Bangladesh
Journal name Field Crops Research   Check publisher's open access policy
ISSN 0378-4290
1872-6852
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.fcr.2014.09.009
Open Access Status Not yet assessed
Volume 169
Start page 77
End page 88
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1102 Agronomy and Crop Science
1111 Soil Science
Abstract Dry seeding of aman rice can facilitate timely crop establishment and early harvest and thus help to alleviate the monga (hunger) period in the High Ganges Flood Plain of Bangladesh. Dry seeding also offers many other potential benefits, including reduced cost of crop establishment and improved soil structure for crops grown in rotation with rice. However, the optimum time for seeding in areas where farmers have access to water for supplementary irrigation has not been determined. We hypothesized that earlier sowing is safer, and that increasing seed rate mitigates the adverse effects of significant rain after sowing on establishment and crop performance. To test these hypotheses, we analyzed long term rainfall data, and conducted field experiments on the effects of sowing date (target dates of 25 May, 10 June, 25 June, and 10 July) and seed rate (20, 40, and 60kgha) on crop establishment, growth, and yield of dry seeded Binadhan-7 (short duration, 110-120d) during the 2012 and 2013 rainy seasons. Wet soil as a result of untimely rainfall usually prevented sowing on the last two target dates in both years, but not on the first two dates. Rainfall analysis also suggested a high probability of being able to dry seed in late May/early June, and a low probability of being able to dry seed in late June/early July. Delaying sowing from 25 May/10 June to late June/early July usually resulted in 20-25% lower plant density and lower uniformity of the plant stand as a result of rain shortly after sowing. Delaying sowing also reduced crop duration, and tillering or biomass production when using a low seed rate. For the late June/early July sowings, there was a strong positive relationship between plant density and yield, but this was not the case for earlier sowings. Thus, increasing seed rate compensated for the adverse effect of untimely rains after sowing on plant density and the shorter growth duration of the late sown crops. The results indicate that in this region, the optimum date for sowing dry seeded rice is late May to early June with a seed rate of 40kgha. Planting can be delayed to late June/early July with no yield loss using a seed rate of 60kgha, but in many years, the soil is simply too wet to be able to dry seed at this time due to rainfall.
Formatted abstract
Dry seeding of aman rice can facilitate timely crop establishment and early harvest and thus help to alleviate the monga (hunger) period in the High Ganges Flood Plain of Bangladesh. Dry seeding also offers many other potential benefits, including reduced cost of crop establishment and improved soil structure for crops grown in rotation with rice. However, the optimum time for seeding in areas where farmers have access to water for supplementary irrigation has not been determined. We hypothesized that earlier sowing is safer, and that increasing seed rate mitigates the adverse effects of significant rain after sowing on establishment and crop performance. To test these hypotheses, we analyzed long term rainfall data, and conducted field experiments on the effects of sowing date (target dates of 25 May, 10 June, 25 June, and 10 July) and seed rate (20, 40, and 60 kg ha−1) on crop establishment, growth, and yield of dry seeded Binadhan-7 (short duration, 110–120 d) during the 2012 and 2013 rainy seasons. Wet soil as a result of untimely rainfall usually prevented sowing on the last two target dates in both years, but not on the first two dates. Rainfall analysis also suggested a high probability of being able to dry seed in late May/early June, and a low probability of being able to dry seed in late June/early July. Delaying sowing from 25 May/10 June to late June/early July usually resulted in 20–25% lower plant density and lower uniformity of the plant stand as a result of rain shortly after sowing. Delaying sowing also reduced crop duration, and tillering or biomass production when using a low seed rate. For the late June/early July sowings, there was a strong positive relationship between plant density and yield, but this was not the case for earlier sowings. Thus, increasing seed rate compensated for the adverse effect of untimely rains after sowing on plant density and the shorter growth duration of the late sown crops. The results indicate that in this region, the optimum date for sowing dry seeded rice is late May to early June with a seed rate of 40 kg ha−1. Planting can be delayed to late June/early July with no yield loss using a seed rate of 60 kg ha−1, but in many years, the soil is simply too wet to be able to dry seed at this time due to rainfall.
Keyword Sowing date
Seed rate
Establishment
Irrigation
Terminal drought
Yield
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
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Created: Tue, 28 Oct 2014, 05:17:04 EST by Bhagirath Chauhan on behalf of Centre for Crop Science