Abstract
Approaches taken in management of fertiliser nitrogen (N) in dry-seeded, delayed-flood rice (Oryza sativa L.) in the United States of America vary considerably. A 2-year study was conducted in Louisiana to evaluate N fertiliser efficiency and accumulation when applied in single or multiple applications. The cultivars Lemont and Tebonnet, representing semi-dwarf and conventional tall plant types, respectively, were grown on a Crowley silt loam (Typic Albaqualfs soil). Urea N was applied using 1 of 3 strategies: in a single (1-way) preflood (PF) application of 134 kg Nlha; in a 2-way split consisting of 100 kg N/ha PF and 34 kg N/ha at panicle initiation (PI); or in a 3-way split consisting of 66 kg N/ha PF, 34 kg N/ha at PI, and 34 kg N/ha at panicle differentiation. Microplots were established within each whole plot and fertilised with 2 atom% 15N urea. Fertiliser N application time had no influence on plant accumulation of 15N urea or biomass production. Plant accumulation of 15N urea was significant across year and cultivar. Tebonnet accumulated more 15N urea than Lemont. Accumulation was also significantly higher in 1992. Method of application of fertiliser N significantly affected grain yields. The highest average grain yield of 7905 kg/ha occurred with a single PF application. Yields were reduced by 378 kg/ha with a 2-way split application and by 1074 kg/ha with a 3-way split application. Method of application of main crop fertiliser N had no effect on ratoon crop yields. Total grain yield (main + ratoon) was significantly reduced with the 3-way split. This study demonstrates the importance of supplying adequate N to the rice plant before permanent flood establishment. It also suggests that midseason N applied at specific growth stages is less efficiently utilised, especially when insufficient N is applied at PF.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Fertilizer timing did not influence rice uptake of labeled urea or biomass.
- Taxon
- rice
Oryza sativae1 - Treatment
- Fertiliser N application timee0
- Outcome
- plant accumulation of 15N urea or biomass productione0
- Direction
- no influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertiliser N application time had no influence on plant accumulation of 15N urea or biomass production”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Labeled urea accumulation differed significantly across year and cultivar.
- Taxon
- riceOryza sativae1
- Material
- cultivare0
- Outcome
- Plant accumulation of 15N ureae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plant accumulation of 15N urea was significant across year and cultivar”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Tebonnet accumulated more labeled urea than Lemont.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tebonnet accumulated more 15N urea than Lemont”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Labeled urea accumulation was significantly higher in 1992.
- Taxon
- riceOryza sativae2
- Outcome
- Plant accumulation of 15N ureae1
- Direction
- highere0
- Setting
- 1992e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation was also significantly higher in 1992”
e1“Plant accumulation of 15N urea”
e2“rice (Oryza sativa L.)”
Claim · model-written summary
Fertilizer application method significantly affected rice grain yield.
- Taxon
- riceOryza sativae1
- Treatment
- Method of application of fertiliser Ne0
- Outcome
- grain yieldse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Method of application of fertiliser N significantly affected grain yields”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Single preflood fertilizer application produced the highest average grain yield of 7905 kg/ha.
- Taxon
- riceOryza sativae1
- Treatment
- single PF applicatione0
- Outcome
- average grain yielde0
- Direction
- higheste0
- Value
- 7905 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest average grain yield of 7905 kg/ha occurred with a single PF application”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Two-way split fertilizer application reduced rice yield by 378 kg/ha.
- Taxon
- riceOryza sativae2
- Treatment
- 2-way split applicatione0
- Outcome
- Yieldse0
- Direction
- reducede0
- Value
- 378 kg/hae0
- Comparator
- single PF applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were reduced by 378 kg/ha with a 2-way split application”
e1“single PF application”
e2“rice (Oryza sativa L.)”
Claim · model-written summary
Three-way split fertilizer application reduced rice yield by 1074 kg/ha.
- Taxon
- riceOryza sativae2
- Treatment
- 3-way split applicatione0
- Outcome
- Yieldse0
- Direction
- reducede0
- Value
- 1074 kg/hae0
- Comparator
- single PF applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were reduced by 378 kg/ha with a 2-way split application and by 1074 kg/ha with a 3-way split application”
e1“single PF application”
e2“rice (Oryza sativa L.)”
Claim · model-written summary
Fertilizer application method had no effect on ratoon crop yields.
- Taxon
- riceOryza sativae1
- Treatment
- Method of application of main crop fertiliser Ne0
- Outcome
- ratoon crop yieldse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Method of application of main crop fertiliser N had no effect on ratoon crop yields”
e1“rice (Oryza sativa L.)”
Claim · model-written summary
Three-way split fertilizer significantly reduced total main and ratoon grain yield.
- Taxon
- riceOryza sativae2
- Treatment
- 3-way splite0
- Outcome
- Total grain yield (main + ratoon)e0
- Direction
- reducede0
- Comparator
- single PF applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total grain yield (main + ratoon) was significantly reduced with the 3-way split”
e1“single PF application”
e2“rice (Oryza sativa L.)”
The same questions in other papers
nitrogen · yield · Oryza sativa (rice)Positive and negative results
241 papers in the same direction as this paper · 1,803 in the opposite direction
- positive
- positive
- positive
2,041 papers more in this group
See all 2,045 papers →fertilization · yield · Oryza sativa (rice)Positive and negative results
271 papers in the same direction as this paper · 3,183 in the opposite direction
- positive
- positive
- positive
3,451 papers more in this group
See all 3,455 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.