Abstract
Nitrogen is the most limiting nutrient in tropical soils and nitrogen fertilizer application to rice is subject to losses. Good synchrony of nitrogen availability to crop’s need is a strategy to reduce losses and improve efficiency. A pot experiment was conducted to assess the effect of seedling age and time of urea supergranule application on rice growth, yield and nitrogen use efficiency. The experiment consisted of 10, 14, 21 and 28-day old seedlings and urea supergranule applied at 0, 7, 14 and 21 days after transplanting with a check treatment without nitrogen application. Results indicated significant effect of seedling age on growth, yield and nitrogen use efficiency. Highest grain yield, nitrogen uptake, agronomic use efficiency of nitrogen and nitrogen recovery efficiency were obtained with 10 and 14-day old seedlings, while the lowest values were observed for 28-day old seedlings. Urea supergranule applied at 7 or 14 days after transplanting gave the highest rice growth parameters while the lowest performances were obtained with urea supergranule applied at 0 and 21 days after transplanting. The interactive effect showed better growth, yield and nitrogen use efficiency of rice when urea supergranule was applied at 7 or 14 days after transplanting seedlings of 10 and 14-day old. The results suggested that even though application of urea supergranule at 7 and 14 days after transplanting increased rice yield over 0 and 21 days after transplanting, for the aged seedlings of 21 and 28-day old, the variation of urea supergranule application time could not compensate for the decrease of yield due to old seedlings transplanting.
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Claims 7
Claim · model-written summary
Rice from 10- and 14-day old seedlings had the highest grain yield, nitrogen uptake and agronomic nitrogen use efficiency, compared with 28-day old seedlings.
- Taxon
- rice
Oryza sativat0 - Treatment
- 10 and 14-day old seedlingse1
- Outcome
- grain yield, nitrogen uptake, agronomic use efficiency of nitrogene1
- Direction
- Higheste1
- Comparator
- 28-day old seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth, yield and nitrogen use efficiency”
e1“Highest grain yield, nitrogen uptake, agronomic use efficiency of nitrogen and nitrogen recovery efficiency were obtained with 10 and 14-day old seedlings, while the lowest values were observed for 28-day old seedlings”
Claim · model-written summary
Rice from 10- and 14-day old seedlings had the highest nitrogen recovery efficiency, compared with 28-day old seedlings.
- Taxon
- riceOryza sativat0
- Treatment
- 10 and 14-day old seedlingse1
- Outcome
- nitrogen recovery efficiencye1
- Direction
- Higheste1
- Comparator
- 28-day old seedlingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth, yield and nitrogen use efficiency”
e1“Highest grain yield, nitrogen uptake, agronomic use efficiency of nitrogen and nitrogen recovery efficiency were obtained with 10 and 14-day old seedlings, while the lowest values were observed for 28-day old seedlings”
Claim · model-written summary
Urea supergranule applied at 7 or 14 days after transplanting gave the highest rice growth parameters, compared with application at 0 and 21 days.
- Taxon
- riceOryza sativae1
- Treatment
- Urea supergranule applied at 7 or 14 days after transplantinge1
- Outcome
- rice growth parameterse1
- Direction
- higheste1
- Comparator
- urea supergranule applied at 0 and 21 days after transplantinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Urea supergranule applied at 7 or 14 days after transplanting gave the highest rice growth parameters while the lowest performances were obtained with urea supergranule applied at 0 and 21 days after transplanting”
Claim · model-written summary
Seedling age had a significant effect on rice growth, yield and nitrogen use efficiency.
- Taxon
- riceOryza sativat0
- Treatment
- seedling agee1
- Outcome
- growth, yield and nitrogen use efficiencye1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice growth, yield and nitrogen use efficiency”
e1“Results indicated significant effect of seedling age on growth, yield and nitrogen use efficiency”
Claim · model-written summary
Urea supergranule timing applied to 10- and 14-day old seedlings gave better rice growth, yield and nitrogen use efficiency in an interaction effect.
- Taxon
- riceOryza sativae1
- Treatment
- urea supergranule was applied at 7 or 14 days after transplanting seedlings of 10 and 14-day olde1
- Outcome
- growth, yield and nitrogen use efficiencye1
- Direction
- bettere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The interactive effect showed better growth, yield and nitrogen use efficiency of rice when urea supergranule was applied at 7 or 14 days after transplanting seedlings of 10 and 14-day old”
Claim · model-written summary
Urea supergranule at 7 and 14 days after transplanting increased rice yield over application at 0 and 21 days.
- Taxon
- riceOryza sativae1
- Treatment
- application of urea supergranule at 7 and 14 days after transplantinge1
- Outcome
- rice yielde1
- Direction
- increasede1
- Comparator
- 0 and 21 days after transplantinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“application of urea supergranule at 7 and 14 days after transplanting increased rice yield over 0 and 21 days after transplanting”
Claim · model-written summary
For aged 21- and 28-day old seedlings, delaying urea supergranule application could not offset the yield decrease caused by old seedlings.
- Taxon
- riceOryza sativae1
- Treatment
- aged seedlings of 21 and 28-day olde1
- Outcome
- yielde1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“even though application of urea supergranule at 7 and 14 days after transplanting increased rice yield over 0 and 21 days after transplanting, for the aged seedlings of 21 and 28-day old, the variation of urea supergranule application time could not compensate for the decrease of yield due to old seedlings transplanting”
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