Abstract
Dry direct-seeded aerobic rice (DSR) is an emerging attractive alternative to traditional puddled transplanted rice (PTR) production system for reducing labour and irrigation water requirements in the Indo-Gangetic plains (IGP) of India. The fertilizer N requirement of DSR grown with alternate wetting and drying water management may differ from that of PTR grown under continuous flooding due to differences in N dynamics in the soil/water system and crop growth patterns. Limited studies have been conducted on optimizing N management and application schedule for enhanced N use efficiency in DSR. Therefore, field experiments were conducted over 3 years in NW India to evaluate the effects of N rate and timing of its application on crop performance and N use efficiency. Interaction effects of four N rates (0, 120, 150, and 180 kg ha−1) as urea and four schedules of N application on yield and N use efficiency were evaluated in DSR. The N schedules included N application in three equal split doses (0, 35 and 63, and 14, 35 and 63 days after sowing, DAS) and four equal split doses (0, 28, 49 and 70; 14, 28, 49 and 70 DAS). There was no significant interaction between N rate and schedules on grain yield. Significant response to fertilizer N was observed at 120 kg N ha−1 and economic optimum dose for three equal split doses and skipping N at sowing was 130 kg N ha−1. Highest mean grain yield of 6.60 t ha−1 was obtained when N was applied in three equal split doses at 14, 35 and 63 DAS which was about 8.5% higher compared with N applied in four equal split doses at 14, 28, 49 and 70 DAS. Under the best N application schedule, agronomic N use efficiency (26 kg grain kg−1), recovery efficiency (49%) and physiological efficiency (53 kg kg−1) were comparable to the values reported in Asia for PTR. Results from our study will help to achieve high yields and N use efficiency in DSR to replace resource intensive PTR.
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Claims 7
Claim · model-written summary
There was no significant interaction between N rate and N application schedule on grain yield of dry-seeded rice.
Not reportedComparatorDirection
Verbatim
e0“There was no significant interaction between N rate and schedules on grain yield”
t0“dry-seeded rice”
Claim · model-written summary
Dry-seeded rice showed a significant response to fertilizer N at 120 kg N ha-1.
Not reportedComparatorDirection
Verbatim
e0“Significant response to fertilizer N was observed at 120 kg N ha−1”
t0“dry-seeded rice”
Claim · model-written summary
The economic optimum N dose for three equal split doses with N skipped at sowing was 130 kg N ha-1.
Not reportedDirection
Verbatim
e0“economic optimum dose for three equal split doses and skipping N at sowing was 130 kg N ha−1”
t0“dry-seeded rice”
Claim · model-written summary
The highest mean grain yield of 6.60 t ha-1 was obtained with N in three equal split doses at 14, 35 and 63 DAS, about 8.5% higher than four equal split doses.
Verbatim
e0“Highest mean grain yield of 6.60 t ha−1 was obtained when N was applied in three equal split doses at 14, 35 and 63 DAS which was about 8.5% higher compared with N applied in four equal split doses at 14, 28, 49 and 70 DAS”
t0“dry-seeded rice”
Claim · model-written summary
Under the best N schedule, agronomic N use efficiency (26 kg grain kg-1) was comparable to values reported in Asia for puddled transplanted rice.
Verbatim
e0“Under the best N application schedule, agronomic N use efficiency (26 kg grain kg−1), recovery efficiency (49%) and physiological efficiency (53 kg kg−1) were comparable to the values reported in Asia for PTR”
t0“dry-seeded rice”
Claim · model-written summary
Under the best N schedule, recovery efficiency (49%) was comparable to values reported in Asia for puddled transplanted rice.
Verbatim
e0“Under the best N application schedule, agronomic N use efficiency (26 kg grain kg−1), recovery efficiency (49%) and physiological efficiency (53 kg kg−1) were comparable to the values reported in Asia for PTR”
t0“dry-seeded rice”
Claim · model-written summary
Under the best N schedule, physiological efficiency (53 kg kg-1) was comparable to values reported in Asia for puddled transplanted rice.
Verbatim
e0“Under the best N application schedule, agronomic N use efficiency (26 kg grain kg−1), recovery efficiency (49%) and physiological efficiency (53 kg kg−1) were comparable to the values reported in Asia for PTR”
t0“dry-seeded rice”
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