Abstract
Field experiments were conducted in farmers' rice fields in 2001 and 2002 to study the effects of nitrogen (N) management strategies on N use efficiency in recovery (RE), agronomy (AE) and physiology (PE) and redistribution of dry matter accumulation (DMA) and nitrogen accumulation (NA) in two typical rice cultivars in Jinhua, Zhejiang Province. This study aimed mainly at identifying the possible causes of poor fertilizer N use efficiency (NUE) of rice in Zhejiang by comparing farmers' fertilizer practice (FFP) with advanced site-specific nutrient management (SSNM) and real-time N management (RTNM). The results showed that compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering. There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR) and post-flowering nitrogen redistribution (post-NR). These results suggest that high input rate of fertilizer N and improper fertilizer N timing are the main factors causing low NUE of irrigated rice in the farmer's routine practice of Zhejiang. With SSNM, about 15% of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang, China.
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Claims 9
Claim · model-written summary
SSNM and RTNM reduced dry matter accumulation before panicle initiation relative to FFP.
- Taxon
- rice
Oryza sativat0 - Treatment
- SSNM and RTNMe0
- Outcome
- DMAe0
- Direction
- reducede0
- Qualifier
- before panicle initiatione0
- Comparator
- FFPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation”
t0“rice”
Claim · model-written summary
SSNM and RTNM reduced nitrogen accumulation before panicle initiation relative to FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNM and RTNMe0
- Outcome
- NAe0
- Direction
- reducede0
- Qualifier
- before panicle initiatione0
- Comparator
- FFPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation”
t0“rice”
Claim · model-written summary
SSNM and RTNM increased post-flowering dry matter accumulation relative to FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNM and RTNMe0
- Outcome
- DMAe0
- Direction
- increasede0
- Qualifier
- post-floweringe0
- Comparator
- FFPe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering”
e1“compared to FFP”
t0“rice”
Claim · model-written summary
SSNM and RTNM increased post-flowering nitrogen accumulation relative to FFP.
- Taxon
- riceOryza sativat0
- Treatment
- SSNM and RTNMe0
- Outcome
- NAe0
- Direction
- increasede0
- Qualifier
- post-floweringe0
- Comparator
- FFPe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering”
e1“compared to FFP”
t0“rice”
Claim · model-written summary
SSNM and FFP did not differ significantly in post-flowering dry matter redistribution.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe0
- Outcome
- post-flowering dry matter redistributione0
- Direction
- no significant differencee0
- Comparator
- FFPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR)”
t0“rice”
Claim · model-written summary
SSNM and FFP did not differ significantly in post-flowering nitrogen redistribution.
- Taxon
- riceOryza sativat0
- Treatment
- SSNMe0
- Outcome
- post-flowering nitrogen redistributione0
- Direction
- no significant differencee0
- Comparator
- FFPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR) and post-flowering nitrogen redistribution (post-NR)”
t0“rice”
Claim · model-written summary
High fertilizer N input and improper timing are suggested causes of low N use efficiency.
- Taxon
- riceOryza sativae0
- Outcome
- low NUEe0
- Qualifier
- high input rate of fertilizer N and improper fertilizer N timinge0
- Setting
- Zhejiange0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high input rate of fertilizer N and improper fertilizer N timing are the main factors causing low NUE of irrigated rice in the farmer's routine practice of Zhejiang”
Claim · model-written summary
With SSNM, direct-seeding early rice N input could fall about 15% without yield loss.
- Taxon
- riceOryza sativae0
- Treatment
- SSNMe0
- Outcome
- total N inpute0
- Direction
- reducede0
- Value
- 15%e0
- Qualifier
- without yield losse0
- Setting
- Zhejiang, Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With SSNM, about 15% of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang, China”
Claim · model-written summary
With SSNM, single rice N input could fall 45% without yield loss.
- Taxon
- riceOryza sativae0
- Treatment
- SSNMe0
- Outcome
- total N inpute0
- Direction
- reducede0
- Value
- 45%e0
- Qualifier
- without yield losse0
- Setting
- Zhejiang, Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With SSNM, about 15% of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang, China”
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See all 759 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.