Abstract
Nitrogen (N) fertilizer, while essential for high yield and profit in rice ( Oryza sativa L.) farming, is often managed inefficiently by Asian rice farmers. We evaluated the leaf color chart (LCC) as a simple tool for improving the time and rate of N fertilizer use in farmers’ fields with no limitation in water supply in southwestern Bangladesh. Use of the LCC for N management consistently increased grain yield and profit as compared with the farmers’ fertilizer practice across the three wet (Aman) and three dry (Boro) seasons, which each involved 1 to 5 villages and a total of 8 to 36 farmers. Use of the LCC for N management without any other change in the farmers’ fertilizer or crop management increased average grain yield by 0.1 to 0.7 Mg ha −1 across villages and seasons. This corresponded to an average added net return of US$ 41 to 65 ha −1 season −1 , which arose largely because of increased yield. Grain yields were increased by an additional ≥0.3 Mg ha −1 at about half the combinations of villages and seasons when the LCC was combined with recommended P, K, S, and Zn fertilization. Grain yields were further increased by another ≥0.4 Mg ha −1 at about half the combinations of villages and seasons when the LCC and recommended P, K, S, and Zn fertilization were combined with improved crop management, involving the recommended manual weed control and plant spacing. Use of the LCC with rice is ready for wide‐scale promotion in Bangladesh.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. 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 7
Claim · model-written summary
Leaf color chart nitrogen management increased rice grain yield relative to farmer fertilizer practice.
- Taxon
- rice
Oryza sativae1 - Treatment
- Use of the LCC for N managemente0
- Outcome
- grain yielde0
- Direction
- increasede0
- Qualifier
- three wet (Aman) and three dry (Boro) seasonse0
- Comparator
- farmers’ fertilizer practicee0
- Setting
- southwestern Bangladeshe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of the LCC for N management consistently increased grain yield and profit as compared with the farmers’ fertilizer practice across the three wet (Aman) and three dry (Boro) seasons”
e1“rice ( Oryza sativa L.) farming”
e2“southwestern Bangladesh”
Claim · model-written summary
Leaf color chart nitrogen management increased rice profit relative to farmer fertilizer practice.
- Taxon
- riceOryza sativae1
- Treatment
- Use of the LCC for N managemente0
- Outcome
- profite0
- Direction
- increasede0
- Comparator
- farmers’ fertilizer practicee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of the LCC for N management consistently increased grain yield and profit as compared with the farmers’ fertilizer practice across the three wet (Aman) and three dry (Boro) seasons”
e1“rice ( Oryza sativa L.) farming”
Claim · model-written summary
With no other management change, LCC nitrogen management raised average rice grain yield by 0.1 to 0.7 Mg ha −1.
- Taxon
- riceOryza sativae1
- Treatment
- Use of the LCC for N managemente0
- Outcome
- average grain yielde0
- Direction
- increasede0
- Value
- 0.1 to 0.7 Mg ha −1e0
- Qualifier
- across villages and seasonse0
- Comparator
- farmers’ fertilizer or crop managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of the LCC for N management without any other change in the farmers’ fertilizer or crop management increased average grain yield by 0.1 to 0.7 Mg ha −1 across villages and seasons”
e1“rice ( Oryza sativa L.) farming”
Claim · model-written summary
LCC nitrogen management added average net return of US$ 41 to 65 ha −1 season −1.
- Taxon
- riceOryza sativae2
- Treatment
- Use of the LCC for N managemente1
- Outcome
- average added net returne0
- Direction
- addede0
- Value
- US$ 41 to 65 ha −1 season −1e0
- Qualifier
- arose largely because of increased yielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This corresponded to an average added net return of US$ 41 to 65 ha −1 season −1 , which arose largely because of increased yield”
e1“Use of the LCC for N management consistently increased grain yield and profit”
e2“rice ( Oryza sativa L.) farming”
Claim · model-written summary
Adding recommended P, K, S and Zn fertilization to LCC management further raised grain yield by at least 0.3 Mg ha −1 for about half of village-season combinations.
- Taxon
- riceOryza sativae1
- Treatment
- the LCC was combined with recommended P, K, S, and Zn fertilizatione0
- Outcome
- Grain yieldse0
- Direction
- increasede0
- Value
- ≥0.3 Mg ha −1e0
- Qualifier
- about half the combinations of villages and seasonse0
- Comparator
- the LCCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields were increased by an additional ≥0.3 Mg ha −1 at about half the combinations of villages and seasons when the LCC was combined with recommended P, K, S, and Zn fertilization”
e1“rice ( Oryza sativa L.) farming”
Claim · model-written summary
Adding improved management to LCC and recommended fertilization further increased yield by at least 0.4 Mg ha −1 for about half of village-season combinations.
- Taxon
- riceOryza sativae1
- Treatment
- the LCC and recommended P, K, S, and Zn fertilization were combined with improved crop managemente0
- Outcome
- Grain yieldse0
- Direction
- further increasede0
- Value
- ≥0.4 Mg ha −1e0
- Qualifier
- about half the combinations of villages and seasonse0
- Comparator
- the LCC and recommended P, K, S, and Zn fertilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields were further increased by another ≥0.4 Mg ha −1 at about half the combinations of villages and seasons when the LCC and recommended P, K, S, and Zn fertilization were combined with improved crop management, involving the recommended manual weed control and plant spacing”
e1“rice ( Oryza sativa L.) farming”
Claim · model-written summary
The authors recommend wide promotion of LCC use in rice in Bangladesh.
- Taxon
- riceOryza sativae0
- Outcome
- wide‐scale promotione0
- Setting
- Bangladeshe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of the LCC with rice is ready for wide‐scale promotion in Bangladesh”
The same questions in other papers
zinc atom · yield · Oryza sativa (rice)Results differ
388 papers in the same direction as this paper · 28 in the opposite direction · 2 reporting no difference from an alternative
- positive
- no effect
- negative
415 papers more in this group
See all 419 papers →potassium · yield · Oryza sativa (rice)Positive and negative results
343 papers in the same direction as this paper · 34 in the opposite direction · 5 reporting no difference from an alternative
- positive
- no effect
- negative
379 papers more in this group
See all 383 papers →phosphorus · yield · Oryza sativa (rice)Positive and negative results
418 papers in the same direction as this paper · 46 in the opposite direction · 10 reporting no difference from an alternative
- positive
- negative
- no effect
471 papers more in this group
See all 475 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
- no effect
- positive
- positive
2,041 papers more in this group
See all 2,045 papers →fertilization · yield · Oryza sativa (rice)Positive and negative results
3,182 papers in the same direction as this paper · 207 in the opposite direction · 65 reporting no difference from an alternative
- positive
- positive
- positive
3,451 papers more in this group
See all 3,455 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.