Abstract
Field experiment was conducted at G.B.P.U.A.T. Pantnagar, Uttarakhand, India in rainy season of 2008 and 2009 to study the impacts of increased nitrogen doses on growth dynamics, biomass partitioning, chaffy grain and nitrogen use efficiency in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa. Four doses (N(0), N(50), N(100) and N(200) kg N ha(-1)) of nitrogen in the form of urea were applied in 3 split. Increased trend in growth dynamics during active tillering and flowering stage, and biomass partitioning at the time of active tillering and flowering stage was observed with respect to nitrogen doses. Chaffy grain number and chaffy grain weight per 5 panicles was significantly increased with enhancing nitrogen doses and was highest for Vasumati. Nitrogen use efficiency (NUE) was increased up to N(100) kg N ha(-1) and it was declined with rising nitrogen doses (N(200) kg N ha(-1)). The highest values for NUE was achieved by rice genotype Krishna Hamsa whereas lowest by Vasumati. In addition to this, a significant correlation between nitrogen doses and growth dynamics, biomass partitioning and chaffy grain was observed. These findings suggest that growth dynamics, biomass partitioning, chaffy grain could be enhanced by the input of high rate of nitrogen fertilizer but not nitrogen use efficiency. Therefore, this study is useful to screen most N efficient genotypes which can be strongly suggested to rice growers to enhance crop yield irrespective of use of high dose of N fertilizers.
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Claims 10
Claim · model-written summary
Growth dynamics of rice increased with nitrogen doses during active tillering and flowering.
- Taxon
- rice
Oryza sativae0 - Organ / stage
- active tillering and flowering stagee3
- Treatment
- nitrogen dosese3
- Outcome
- growth dynamicse3
- Direction
- Increased trende3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e3“Increased trend in growth dynamics during active tillering and flowering stage, and biomass partitioning at the time of active tillering and flowering stage was observed with respect to nitrogen doses”
Claim · model-written summary
Biomass partitioning of rice increased with nitrogen doses at active tillering and flowering.
- Taxon
- riceOryza sativae0
- Organ / stage
- active tillering and flowering stagee3
- Treatment
- nitrogen dosese3
- Outcome
- biomass partitioninge3
- Direction
- Increased trende3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e3“Increased trend in growth dynamics during active tillering and flowering stage, and biomass partitioning at the time of active tillering and flowering stage was observed with respect to nitrogen doses”
Claim · model-written summary
Chaffy grain number and chaffy grain weight per 5 panicles increased significantly with enhancing nitrogen doses.
- Taxon
- riceOryza sativae0
- Treatment
- enhancing nitrogen dosese4
- Outcome
- Chaffy grain number and chaffy grain weight per 5 paniclese4
- Direction
- significantly increasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e4“Chaffy grain number and chaffy grain weight per 5 panicles was significantly increased with enhancing nitrogen doses and was highest for Vasumati”
Claim · model-written summary
Chaffy grain number and weight per 5 panicles were highest for the genotype Vasumati.
- Taxon
- riceOryza sativae0
- Material
- Vasumatie4
- Outcome
- Chaffy grain number and chaffy grain weight per 5 paniclese4
- Qualifier
- highest for Vasumatie4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e4“Chaffy grain number and chaffy grain weight per 5 panicles was significantly increased with enhancing nitrogen doses and was highest for Vasumati”
Claim · model-written summary
Nitrogen use efficiency increased up to 100 kg N ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- N(100) kg N ha(-1)e5
- Outcome
- Nitrogen use efficiency (NUE)e5
- Direction
- increased up toe5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e5“Nitrogen use efficiency (NUE) was increased up to N(100) kg N ha(-1) and it was declined with rising nitrogen doses (N(200) kg N ha(-1))”
Claim · model-written summary
Nitrogen use efficiency declined with rising nitrogen doses to 200 kg N ha-1.
- Taxon
- riceOryza sativae0
- Treatment
- rising nitrogen dosese5
- Outcome
- Nitrogen use efficiency (NUE)e5
- Direction
- declinede5
- Qualifier
- N(200) kg N ha(-1)e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e5“Nitrogen use efficiency (NUE) was increased up to N(100) kg N ha(-1) and it was declined with rising nitrogen doses (N(200) kg N ha(-1))”
Claim · model-written summary
Krishna Hamsa had the highest nitrogen use efficiency among the rice genotypes.
- Taxon
- riceOryza sativae0
- Material
- Krishna Hamsae6
- Outcome
- NUEe6
- Qualifier
- The highest valuese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e6“The highest values for NUE was achieved by rice genotype Krishna Hamsa whereas lowest by Vasumati”
Claim · model-written summary
Vasumati had the lowest nitrogen use efficiency among the rice genotypes.
- Taxon
- riceOryza sativae0
- Material
- Vasumatie6
- Outcome
- NUEe6
- Qualifier
- loweste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e6“The highest values for NUE was achieved by rice genotype Krishna Hamsa whereas lowest by Vasumati”
Claim · model-written summary
Nitrogen doses were significantly correlated with growth dynamics, biomass partitioning and chaffy grain.
- Taxon
- riceOryza sativae0
- Treatment
- nitrogen dosese7
- Outcome
- growth dynamics, biomass partitioning and chaffy graine7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e7“a significant correlation between nitrogen doses and growth dynamics, biomass partitioning and chaffy grain was observed”
Claim · model-written summary
Screening the most nitrogen-efficient rice genotypes is recommended to growers to enhance crop yield under high nitrogen.
- Taxon
- riceOryza sativae0
- Treatment
- screen most N efficient genotypese1
- Outcome
- crop yielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 4 rice genotypes viz., Vasumati, Tulsi, Kasturi and Krishna Hamsa”
e1“Therefore, this study is useful to screen most N efficient genotypes which can be strongly suggested to rice growers to enhance crop yield irrespective of use of high dose of N fertilizers”
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