Abstract
Increasing nitrogen use efficiency in rice intensification (SRI) is pivotal to achieving high crop yield and reducing nitrogen losses. To find the critical value of the leaf color chart (LCC) for real-time nitrogen (N) application in rice varieties under SRI, a field experiment was laid at the Research Farm, Faculty of Agriculture, Wadura, SKAUST-Kashmir in Kharif between 2019 and 2020. The experiment comprised two cultivars (SR-3 and SR-4) and eight LCC-based nitrogen managements (control, recommended dose of nitrogen (RDF), and three LCC scores (≤3, ≤4, ≤5 each with 20 and 30 kg N ha−1). SR-4 produced significantly higher values for growth and yield parameters, producing higher grain yield (7.02 and 6.86 t ha−1) compared to SR-3 (6.49 and 6.36 t ha−1) between 2019 and 2020, respectively. An LCC value of 5 with 30 kg N ha−1 produced maximum grain yield (7.84 and 7.70 t ha−1) in 2019 and 2020, respectively, which were statistically at par with the LCC value of 5 with 20 kg Nha−1. Pooled data revealed that the highest B: C ratio of 1.55 was recorded in cultivar SR-4 with an LCC value of 5 with 30 kg N ha−1. Furthermore, agronomic and recovery efficiency of nitrogen remained maximum in LCC 5 with 20 kg N ha−1 for both years. Grain yield recorded in LCC 3 20 kg N ha−1 was similar to recommended nitrogen. The present study highlighted the need-based N application through LCC and proved effective in increasing the N-use efficiency and yield in rice.
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 8
Claim · model-written summary
Cultivar SR-4 produced significantly higher growth and yield parameters than SR-3.
- Taxon
- rice
Oryza sativat0 - Material
- SR-4e0
- Outcome
- growth and yield parameterse0
- Direction
- highere0
- Comparator
- SR-3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SR-4 produced significantly higher values for growth and yield parameters, producing higher grain yield (7.02 and 6.86 t ha−1) compared to SR-3 (6.49 and 6.36 t ha−1) between 2019 and 2020”
t0“Rice Varieties”
Claim · model-written summary
SR-4 produced higher grain yield (7.02 and 6.86 t/ha in 2019 and 2020) than SR-3 (6.49 and 6.36 t/ha).
- Taxon
- riceOryza sativat0
- Material
- SR-4e0
- Outcome
- grain yielde0
- Direction
- highere0
- Value
- 7.02 and 6.86 t ha−1e0
- Qualifier
- 6.49 and 6.36 t ha−1e0
- Comparator
- SR-3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SR-4 produced significantly higher values for growth and yield parameters, producing higher grain yield (7.02 and 6.86 t ha−1) compared to SR-3 (6.49 and 6.36 t ha−1) between 2019 and 2020”
t0“Rice Varieties”
Claim · model-written summary
An LCC value of 5 with 30 kg N/ha produced the maximum grain yield (7.84 and 7.70 t/ha in 2019 and 2020).
- Taxon
- riceOryza sativat0
- Treatment
- LCC value of 5 with 30 kg N ha−1e1
- Outcome
- grain yielde1
- Direction
- maximume1
- Value
- 7.84 and 7.70 t ha−1e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“An LCC value of 5 with 30 kg N ha−1 produced maximum grain yield (7.84 and 7.70 t ha−1) in 2019 and 2020”
t0“Rice Varieties”
Claim · model-written summary
Grain yield with LCC 5 and 30 kg N/ha was statistically at par with LCC 5 and 20 kg N/ha.
- Taxon
- riceOryza sativat0
- Treatment
- LCC value of 5 with 30 kg N ha−1e1
- Outcome
- grain yielde1
- Direction
- at pare1
- Comparator
- LCC value of 5 with 20 kg Nha−1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“An LCC value of 5 with 30 kg N ha−1 produced maximum grain yield (7.84 and 7.70 t ha−1) in 2019 and 2020, respectively, which were statistically at par with the LCC value of 5 with 20 kg Nha−1”
t0“Rice Varieties”
Claim · model-written summary
The highest benefit:cost ratio (1.55) was recorded in SR-4 with an LCC value of 5 and 30 kg N/ha (pooled data).
- Taxon
- riceOryza sativat0
- Material
- SR-4e2
- Treatment
- LCC value of 5 with 30 kg N ha−1e2
- Outcome
- B: C ratioe2
- Direction
- higheste2
- Value
- 1.55e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the highest B: C ratio of 1.55 was recorded in cultivar SR-4 with an LCC value of 5 with 30 kg N ha−1”
t0“Rice Varieties”
Claim · model-written summary
Agronomic and recovery efficiency of nitrogen were maximum with LCC 5 and 20 kg N/ha in both years.
- Taxon
- riceOryza sativat0
- Treatment
- LCC 5 with 20 kg N ha−1e3
- Outcome
- agronomic and recovery efficiency of nitrogene3
- Direction
- maximume3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“agronomic and recovery efficiency of nitrogen remained maximum in LCC 5 with 20 kg N ha−1 for both years”
t0“Rice Varieties”
Claim · model-written summary
Grain yield under LCC 3 with 20 kg N/ha was similar to that under the recommended nitrogen.
- Taxon
- riceOryza sativat0
- Treatment
- LCC 3 20 kg N ha−1e4
- Outcome
- Grain yielde4
- Direction
- similare4
- Comparator
- recommended nitrogene4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Grain yield recorded in LCC 3 20 kg N ha−1 was similar to recommended nitrogen”
t0“Rice Varieties”
Claim · model-written summary
Need-based N application through LCC proved effective in increasing N-use efficiency and yield in rice.
- Taxon
- riceOryza sativae5
- Treatment
- need-based N application through LCCe5
- Outcome
- N-use efficiency and yielde5
- Direction
- increasinge5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“the need-based N application through LCC and proved effective in increasing the N-use efficiency and yield in rice”
The same questions in other papers
nitrogen · yield · Oryza sativa (rice)Positive and negative results
1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative
- positive
- positive
- positive
2,041 papers more in this group
See all 2,045 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.