Abstract
Field experiments were conducted during 2006–08 to study the response of hybrid rice cultivar PHB 71 to fertilizer N and to study the possibility of improving N-use efficiency by affecting fertilizer N as per need of the crop as guided by leaf colour chart (LCC). Treatments included six rates of N application (0, 60, 90, 120,150 and 180 kg/ha) applied in three equal splits at fixed growth stages. The two need-based N management treatments comprised of application of 20 kg N / ha as basal dose and application of 30 kg N /ha whenever greenness first fully opened leaf from the top was less than shade 4 or 5 on the LCC. Hybrid rice PHB 71 showed significant response to application of N up to 120 kg N /ha applied in three equal split doses. Beyond this level fertilizer N-use efficiency was significantly reduced. The LCC shade 4 proved better than LCC shade 5 for guiding real time N management and achieving higher N-use efficiency. Application of 80–110 kg N /ha using threshold LCC shade 4 inclusive of 20 kg N /ha as basal dose produced grain yield of rice which was at par with the application of 120 kg N /ha applied in three equal split doses.
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Claims 4
Claim · model-written summary
Hybrid rice PHB 71 responded significantly to nitrogen up to 120 kg N /ha in three equal doses.
- Taxon
- Hybrid rice
Oryza sativae0 - Material
- PHB 71e0
- Treatment
- application of N up to 120 kg N /hae0
- Outcome
- responsee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid rice PHB 71 showed significant response to application of N up to 120 kg N /ha applied in three equal split doses.”
Claim · model-written summary
Beyond 120 kg N /ha, fertilizer nitrogen use efficiency declined significantly.
- Taxon
- hybrid riceOryza sativat0
- Treatment
- Beyond this levele0
- Outcome
- fertilizer N-use efficiencye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beyond this level fertilizer N-use efficiency was significantly reduced.”
t0“hybrid rice”
Claim · model-written summary
LCC shade 4 guided nitrogen management with higher nitrogen use efficiency than shade 5.
- Taxon
- hybrid riceOryza sativat0
- Treatment
- LCC shade 4e0
- Outcome
- N-use efficiencye0
- Direction
- highere0
- Comparator
- LCC shade 5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The LCC shade 4 proved better than LCC shade 5 for guiding real time N management and achieving higher N-use efficiency.”
t0“hybrid rice”
Claim · model-written summary
LCC shade 4 guided 80–110 kg N /ha achieved rice grain yield at par with 120 kg N /ha in three splits.
- Taxon
- riceOryza sativae0
- Treatment
- Application of 80–110 kg N /ha using threshold LCC shade 4 inclusive of 20 kg N /ha as basal dosee0
- Outcome
- grain yield of ricee0
- Direction
- at pare0
- Comparator
- application of 120 kg N /ha applied in three equal split dosese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 80–110 kg N /ha using threshold LCC shade 4 inclusive of 20 kg N /ha as basal dose produced grain yield of rice which was at par with the application of 120 kg N /ha applied in three equal split doses.”
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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.