Abstract
SummaryThe interaction between N application and water management (ordinary water (OW) and deep-water (DW)) in dry-seeded rice was studied in 1995 and 1996. Deep-water treatment increased the percentage of ripened grain and grain yield, and decreased panicle number per m2. The maximum number of tillers and the percentage of productive tillers was increased by increasing the amount of N applied (0, 70, 150, 220 kg ha–1) in both water treatments. More tillers was produced in OW than in DW. However, the percentage of productive tiller was higher in DW than in OW (78% in 1995 and 72% in 1996 for OW and 86% in 1995 and 83% in 1996 for DW). There were significant differences in yield components and yield between the amount of N applied, and between the two water treatments. The panicle number per m2 (r = 0.904** in OW, r = 0.921** in DW) was positively correlated with the amount of N applied. In DW, the number of panicles was lower than in OW, but the percentage of ripened grain was higher than in OW. The total nitrogen contents in the flag leaf was positively correlated with the amount of N applied and the concentrations of nitrogen in flag leaf was positively correlated with the grain yield. The partial factor productivity (PFP) of applied N was significantly higher in DW than in OW at all levels of nitrogen application. Agronomic nitrogen-use efficiency (ANUE) was not different between the two water treatments. These results imply that the suppression of tiller formation by elevated water level would improve the yield determinants and utilization efficiency of indigenous soil N, which consequently helps to increase yield production.
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Claims 12
Claim · model-written summary
Deep-water treatment increased the percentage of ripened grain and grain yield in dry-seeded rice.
- Taxon
- Dry-Seeded Ricet0
- Treatment
- Deep-water treatmente2
- Outcome
- percentage of ripened grain and grain yielde2
- Direction
- increasede2
Not reportedComparator
Verbatim
t0“Dry-Seeded Rice”
e2“Deep-water treatment increased the percentage of ripened grain and grain yield, and decreased panicle number per m2”
Claim · model-written summary
Deep-water treatment decreased panicle number per m2 in dry-seeded rice.
- Taxon
- Dry-Seeded Ricet0
- Treatment
- Deep-water treatmente2
- Outcome
- panicle number per m2e2
- Direction
- decreasede2
Not reportedComparator
Verbatim
t0“Dry-Seeded Rice”
e2“Deep-water treatment increased the percentage of ripened grain and grain yield, and decreased panicle number per m2”
Claim · model-written summary
Increasing the amount of N applied increased the maximum number of tillers and the percentage of productive tillers in both water treatments.
- Taxon
- Dry-Seeded Ricet0
- Treatment
- increasing the amount of N applied (0, 70, 150, 220 kg ha–1)e3
- Outcome
- maximum number of tillers and the percentage of productive tillerse3
- Direction
- increasede3
- Qualifier
- in both water treatmentse3
Not reportedComparator
Verbatim
t0“Dry-Seeded Rice”
e3“The maximum number of tillers and the percentage of productive tillers was increased by increasing the amount of N applied (0, 70, 150, 220 kg ha–1) in both water treatments”
Claim · model-written summary
More tillers were produced in ordinary water (OW) than in deep-water (DW) in dry-seeded rice.
Verbatim
t0“Dry-Seeded Rice”
e4“More tillers was produced in OW than in DW”
Claim · model-written summary
The percentage of productive tillers was higher in DW than in OW in dry-seeded rice.
Verbatim
t0“Dry-Seeded Rice”
e5“the percentage of productive tiller was higher in DW than in OW (78% in 1995 and 72% in 1996 for OW and 86% in 1995 and 83% in 1996 for DW)”
Claim · model-written summary
Yield components and yield differed significantly between N application amounts and between the two water treatments.
- Taxon
- Dry-Seeded Ricet0
- Treatment
- amount of N appliede6
- Outcome
- yield components and yielde6
- Qualifier
- between the two water treatmentse6
Not reportedDirection
Verbatim
t0“Dry-Seeded Rice”
e6“There were significant differences in yield components and yield between the amount of N applied, and between the two water treatments”
Claim · model-written summary
Panicle number per m2 was positively correlated with the amount of N applied in dry-seeded rice.
Verbatim
t0“Dry-Seeded Rice”
e7“The panicle number per m2 (r = 0.904** in OW, r = 0.921** in DW) was positively correlated with the amount of N applied”
Claim · model-written summary
Total nitrogen content in the flag leaf was positively correlated with the amount of N applied.
Verbatim
t0“Dry-Seeded Rice”
e0“The total nitrogen contents in the flag leaf was positively correlated with the amount of N applied and the concentrations of nitrogen in flag leaf was positively correlated with the grain yield”
Claim · model-written summary
Nitrogen concentration in the flag leaf was positively correlated with grain yield in dry-seeded rice.
Verbatim
t0“Dry-Seeded Rice”
e0“The total nitrogen contents in the flag leaf was positively correlated with the amount of N applied and the concentrations of nitrogen in flag leaf was positively correlated with the grain yield”
Claim · model-written summary
The partial factor productivity of applied N was significantly higher in DW than in OW at all N levels.
Verbatim
t0“Dry-Seeded Rice”
e1“The partial factor productivity (PFP) of applied N was significantly higher in DW than in OW at all levels of nitrogen application”
Claim · model-written summary
Agronomic nitrogen-use efficiency was not different between the two water treatments.
- Taxon
- Dry-Seeded Ricet0
- Treatment
- two water treatmentse1
- Outcome
- Agronomic nitrogen-use efficiency (ANUE)e1
- Direction
- no_changeinferrede1
Not reportedComparator
Verbatim
t0“Dry-Seeded Rice”
e1“Agronomic nitrogen-use efficiency (ANUE) was not different between the two water treatments”
Claim · model-written summary
Suppression of tiller formation by elevated water level would improve yield determinants and utilization efficiency of indigenous soil N in dry-seeded rice.
Verbatim
t0“Dry-Seeded Rice”
e1“These results imply that the suppression of tiller formation by elevated water level would improve the yield determinants and utilization efficiency of indigenous soil N”
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