Abstract
Nitrogen (N) fertilizers have played a significant role in enhancing rice yield over recent decades; however, their excessive use has also led to considerable negative environmental impacts. To achieve sustainable productivity, it is essential to adopt strategies that enhance yield while reducing, or at least minimizing, nitrogen input, thereby improving nitrogen use efficiency (NUE). The crucial physiological reasons for maintaining high yield and NUE in N-efficient varieties were attributed to better root system characteristics. Fourteen selected rice varieties, comprising both short-duration and medium-duration varieties, were screened for NUE based on root characteristics under field conditions at two levels of the recommended dose of nitrogen (RDN). Application of 100 % RDN resulted in a significantly higher root volume and Root dry weight. Interaction effects also showed significant influence. Based on the Root Dry Weight Efficiency Index (RDWEI), seven varieties were classified as efficient (RDWEI > 1.0). At the same time, the remaining seven were moderately efficient (RDWEI 0.5–1.0) and none of the varieties were N inefficient (RDWEI <0.5). Trends in RDWEI were consistent with variations in grain yield, highlighting its reliability as a NUE indicator. Among the evaluated varieties, Harsha recorded the highest grain yield (4.1 t ha⁻¹), which was statistically comparable to Varsha, Aiswarya and Sreyas. Notably, varieties that maintained stable yields under reduced N application demonstrated superior adaptability and NUE. The study confirmed that genetic variability exists in N response, and the interaction between variety and N levels significantly influenced yield and root traits. Identifying N-efficient genotypes with robust root systems presents a promising approach for enhancing N management and promoting sustainable rice production, as well as improved soil health.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Full recommended nitrogen dose significantly increased root volume.
- Taxon
- rice
Oryza sativat0 - Treatment
- 100 % RDNe0
- Outcome
- root volumee0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 100 % RDN resulted in a significantly higher root volume and Root dry weight”
t0“rice”
Claim · model-written summary
Full recommended nitrogen dose significantly increased root dry weight.
- Taxon
- riceOryza sativat0
- Treatment
- 100 % RDNe0
- Outcome
- Root dry weighte0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 100 % RDN resulted in a significantly higher root volume and Root dry weight”
t0“rice”
Claim · model-written summary
Seven rice varieties were efficient by RDWEI.
- Taxon
- riceOryza sativat0
- Outcome
- classified as efficiente0
- Value
- RDWEI > 1.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven varieties were classified as efficient (RDWEI > 1.0)”
t0“rice”
Claim · model-written summary
Seven rice varieties were moderately efficient by RDWEI.
- Taxon
- riceOryza sativat0
- Outcome
- moderately efficiente0
- Value
- RDWEI 0.5–1.0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“remaining seven were moderately efficient (RDWEI 0.5–1.0)”
t0“rice”
Claim · model-written summary
No rice variety was N inefficient by RDWEI.
- Taxon
- riceOryza sativat0
- Outcome
- none of the varieties were N inefficiente0
- Value
- RDWEI <0.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the varieties were N inefficient (RDWEI <0.5)”
t0“rice”
Claim · model-written summary
RDWEI trends were consistent with grain-yield variation.
- Taxon
- riceOryza sativat0
- Outcome
- grain yielde0
- Qualifier
- consistent withe0
- Comparator
- RDWEIe0
Not reportedMaterialDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trends in RDWEI were consistent with variations in grain yield”
t0“rice”
Claim · model-written summary
Harsha had the highest grain yield at 4.1 t ha⁻¹.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harsha recorded the highest grain yield (4.1 t ha⁻¹)”
t0“rice”
Claim · model-written summary
Harsha yield was statistically comparable to Varsha, Aiswarya and Sreyas.
- Taxon
- riceOryza sativat0
- Material
- Harshae0
- Outcome
- grain yielde0
- Direction
- statistically comparablee0
- Comparator
- Varsha, Aiswarya and Sreyase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harsha recorded the highest grain yield (4.1 t ha⁻¹), which was statistically comparable to Varsha, Aiswarya and Sreyas”
t0“rice”
Claim · model-written summary
Varieties with stable yields under reduced N showed superior adaptability and NUE.
- Taxon
- riceOryza sativat0
- Treatment
- reduced N applicatione0
- Outcome
- adaptability and NUEe0
- Direction
- superiore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varieties that maintained stable yields under reduced N application demonstrated superior adaptability and NUE”
t0“rice”
Claim · model-written summary
Genetic variability in rice nitrogen response was found.
- Taxon
- riceOryza sativat0
- Outcome
- genetic variability exists in N responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genetic variability exists in N response”
t0“rice”
Claim · model-written summary
Variety by nitrogen level significantly influenced yield.
- Taxon
- riceOryza sativat0
- Treatment
- N levelse0
- Outcome
- yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction between variety and N levels significantly influenced yield and root traits”
t0“rice”
Claim · model-written summary
Variety by nitrogen level significantly influenced root traits.
- Taxon
- riceOryza sativat0
- Treatment
- N levelse0
- Outcome
- root traitse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction between variety and N levels significantly influenced yield and root traits”
t0“rice”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
- negative
- negative
- negative
507 papers more in this group
See all 511 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.