Abstract
Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China and the effects of nitrogen application timing on grain yield,nitrogen uptake,and the recovery efficiency(RE),the agronomic efficiency(AE),the internal use efficiency(IE),the partial factor productivity(PFP) of fertilizer-nitrogen were investigated with Yueza 122,a two-line hybrid rice combination,as the material.The results showed that: a) Fertilizer-N applied at the early panicle differentiation(PD) and heading resulted in a grain yield increase in three out of four seasons,while N application as the basal or at tillering resulted in yield increase only in one of the four seasons.b) N application at PD and heading increased significantly the N uptake in all four seasons,while N application as the basal or at tillering did in only one season.For a given amount of fertilizer-N,RE and AE were greater when applied at PD and heading than as the basal or at tillering.c) The optimal N uptake increased with the number of sunshine hours during the grain-filling period.It is concluded that delaying the timing of fertilizer-N application by reducing N rate as the basal and/or at tillering and increasing N input at PD and heading are important to achieve a higher grain yield and N use efficiency for double-cropping hybrid rice in South China.
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Claims 7
Claim · model-written summary
Fertilizer-N applied at panicle differentiation and heading increased grain yield in three of four seasons.
- Taxon
- Hybrid Rice
Oryza sativat0 - Material
- Yueza 122e1
- Treatment
- Fertilizer-N applied at the early panicle differentiation(PD) and headinge2
- Outcome
- grain yielde2
- Direction
- increasee2
- Qualifier
- in three out of four seasonse2
- Comparator
- N application as the basal or at tilleringe3
- Setting
- Guangzhou,Guangdong Province,Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e0“Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China”
e1“investigated with Yueza 122,a two-line hybrid rice combination,as the material”
e2“Fertilizer-N applied at the early panicle differentiation(PD) and heading resulted in a grain yield increase in three out of four seasons”
e3“N application as the basal or at tillering resulted in yield increase only in one of the four seasons”
Claim · model-written summary
N application as the basal or at tillering increased yield in only one of four seasons.
- Taxon
- Hybrid RiceOryza sativat0
- Material
- Yueza 122e1
- Treatment
- N application as the basal or at tilleringe3
- Outcome
- yielde3
- Direction
- increasee3
- Qualifier
- only in one of the four seasonse3
- Comparator
- Fertilizer-N applied at the early panicle differentiation(PD) and headinge2
- Setting
- Guangzhou,Guangdong Province,Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e0“Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China”
e1“investigated with Yueza 122,a two-line hybrid rice combination,as the material”
e2“Fertilizer-N applied at the early panicle differentiation(PD) and heading resulted in a grain yield increase in three out of four seasons”
e3“N application as the basal or at tillering resulted in yield increase only in one of the four seasons”
Claim · model-written summary
N application at PD and heading significantly increased N uptake in all four seasons.
- Taxon
- Hybrid RiceOryza sativat0
- Material
- Yueza 122e1
- Treatment
- N application at PD and headinge4
- Outcome
- N uptakee4
- Direction
- increasede4
- Qualifier
- in all four seasonse4
- Setting
- Guangzhou,Guangdong Province,Chinae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e0“Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China”
e1“investigated with Yueza 122,a two-line hybrid rice combination,as the material”
e4“N application at PD and heading increased significantly the N uptake in all four seasons”
Claim · model-written summary
N application as the basal or at tillering increased N uptake in only one season.
- Taxon
- Hybrid RiceOryza sativat0
- Material
- Yueza 122e1
- Treatment
- N application as the basal or at tilleringe5
- Outcome
- N uptakee4
- Direction
- increaseinferrede4
- Qualifier
- in only one seasone5
- Comparator
- N application at PD and headinge4
- Setting
- Guangzhou,Guangdong Province,Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e0“Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China”
e1“investigated with Yueza 122,a two-line hybrid rice combination,as the material”
e4“N application at PD and heading increased significantly the N uptake in all four seasons”
e5“while N application as the basal or at tillering did in only one season”
Claim · model-written summary
Recovery efficiency and agronomic efficiency of fertilizer-N were greater when applied at PD and heading than at basal or tillering.
- Taxon
- Hybrid RiceOryza sativat0
- Material
- Yueza 122e1
- Treatment
- applied at PD and headinge6
- Outcome
- RE and AEe6
- Direction
- greatere6
- Qualifier
- For a given amount of fertilizer-Ne6
- Comparator
- as the basal or at tilleringe6
- Setting
- Guangzhou,Guangdong Province,Chinae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e0“Four field experiments were conducted in four cropping seasons of two years(2004—2005) at Guangzhou,Guangdong Province,China”
e1“investigated with Yueza 122,a two-line hybrid rice combination,as the material”
e6“For a given amount of fertilizer-N,RE and AE were greater when applied at PD and heading than as the basal or at tillering”
Claim · model-written summary
Optimal N uptake increased with the number of sunshine hours during the grain-filling period.
- Taxon
- Hybrid RiceOryza sativat0
- Organ / stage
- grain-filling periode7
- Outcome
- optimal N uptakee7
- Direction
- increasede7
- Qualifier
- number of sunshine hourse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Efficiency of Hybrid Rice in South China”
e7“The optimal N uptake increased with the number of sunshine hours during the grain-filling period”
Claim · model-written summary
Delaying fertilizer-N timing by reducing basal and tillering N and increasing PD and heading N is recommended for a higher grain yield and N use efficiency in double-cropping hybrid rice in South China.
Verbatim
e7“delaying the timing of fertilizer-N application by reducing N rate as the basal and/or at tillering and increasing N input at PD and heading are important to achieve a higher grain yield and N use efficiency for double-cropping hybrid rice in South China”
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