Abstract
Field evaluations of slow‐release N fertilizers are needed to improve N use efficiency while reducing NH 3 volatilization. Ammonia volatilization losses, floodwater NH 4 + , and aboveground rice ( Oryza sativa L.) tissue N accumulation were compared between non‐coated urea (NCU) and polyolefin‐coated urea (POCU) applications in a double‐rice production system of subtropical China. A factorial treatment design included two urea sources such as POCU and NCU applied at 75 and 150 kg N ha −1 , and a no‐N control. For early and late rice seasons, floodwater NH 4 + and pH increased significantly within 7 to 10 d after NCU applications and then decreased rapidly. Nitrogen losses through NH 3 volatilization accounted for 16 to 30% and 4 to 8% of the total N applied for NCU and POCU, respectively. Applications of POCU significantly increased N accumulation in aboveground rice biomass due to a slower N release and better synchrony between in‐season rice N demand and N supply from this fertilizer. Applications of POCU at a rate of 75 kg N ha −1 provided the optimal amounts of N for early and late rice crops and reduced NH 3 volatilization losses. The use of slow release urea fertilizers should increase N use efficiency and maintain the high grain yield in the double rice production systems of subtropical China.
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Claims 5
Claim · model-written summary
Polyolefin-coated urea reduced NH3 volatilization losses to 4 to 8% of applied N, versus 16 to 30% for non-coated urea.
- Treatment
- POCUe1
- Outcome
- Nitrogen losses through NH 3 volatilizatione1
- Direction
- lowerinferrede1
- Value
- 4 to 8%e1
- Qualifier
- 16 to 30%e1
- Comparator
- NCUe1
Not reportedTaxon
Verbatim
e1“Nitrogen losses through NH 3 volatilization accounted for 16 to 30% and 4 to 8% of the total N applied for NCU and POCU”
Claim · model-written summary
Applications of POCU significantly increased N accumulation in aboveground rice biomass.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- aboveground rice biomasse2
- Treatment
- POCUe2
- Outcome
- N accumulation in aboveground rice biomasse2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice ( Oryza sativa L.) tissue N accumulation”
e2“Applications of POCU significantly increased N accumulation in aboveground rice biomass due to a slower N release”
Claim · model-written summary
Floodwater NH4+ and pH increased after non-coated urea application.
Not reportedTaxon
Verbatim
e3“For early and late rice seasons, floodwater NH 4 + and pH increased significantly within 7 to 10 d after NCU applications”
Claim · model-written summary
Polyolefin-coated urea at 75 kg N per ha provided the optimal N amounts for early and late rice crops.
- Taxon
- riceOryza sativae4
- Outcome
- optimal amounts of Ne4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“provided the optimal amounts of N for early and late rice crops”
Claim · model-written summary
Slow-release urea fertilizers are expected to increase N use efficiency and keep high grain yield in double rice systems.
- Taxon
- riceOryza sativae5
- Outcome
- use of slow release urea fertilizerse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“The use of slow release urea fertilizers should increase N use efficiency and maintain the high grain yield in the double rice production systems of subtropical China”
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See all 511 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.