Abstract
Lodging and water deficit (WD) are both yield limiting factors for rice production in Africa. A number of New Rice for Africa (NERICA) cultivars with drought adaptive and high yielding ability have been released but the extent of their lodging susceptibility due to water deficit is unclear. Application of orthosilicic acid (OSA) fertiliser can reduce lodging due to water deficit. An experiment was therefore conducted involving six cultivars (NERICAs 1, 4, 6, 7, 8 and Moroberekan), subjected to five multi-growth stage WD treatments: non-stressed (Nst), 10-day stress at each of any two stages of vegetative (Veg), reproductive (Rep) and grain filling (Grain) stages viz (Veg10 + Rep10), (Veg10 + Grain10), (Rep10 + Grain10), and 7-day stress at each stage (Veg7 + Rep7 + Grain7) and with/without 500 mL ha−1 of OSA fertiliser. Lodging traits (LTs) such as lumen diameter, bending moment, panicle weight (PW) and grain yield (GY) were increased by OSA fertiliser. Under Veg7 + Rep7 + Grain7 stress, OSA fertiliser increased rice vigour through increases in internode length, lumen diameters and cross-section modulus by 7%, 18% and 18%, respectively, while under Veg10 + Rep10 stress, culm wall thickness was increased by 20%. Veg10 + Rep10 stress caused the most significant reduction in all LTs but with lowest lodging index (LI, 0.32) attributed to reduced PW and GY. Among the cultivars, Moroberekan combined higher GY with average LI (0.40) across the stress conditions while NERICA 1 had the lowest LI (0.34) attributed mainly to its short height. Although water deficit caused a reduction in lodging resistant traits, resistance to lodging under Veg10 + Rep10 and Veg7 + Rep7 + Grain7 stresses can be enhanced with OSA fertiliser.
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Claims 10
Claim · model-written summary
OSA increased rice lumen diameter, bending moment, panicle weight, and grain yield.
- Taxon
- rice
Oryza sativat0 - Treatment
- OSA fertilisere0
- Outcome
- lumen diameter, bending moment, panicle weight (PW) and grain yield (GY)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Lodging traits (LTs) such as lumen diameter, bending moment, panicle weight (PW) and grain yield (GY) were increased by OSA fertiliser”
Claim · model-written summary
Under three-stage seven-day stress OSA increased internode length by 7%.
- Taxon
- riceOryza sativat0
- Treatment
- OSA fertilisere0
- Outcome
- internode lengthe0
- Direction
- increasese0
- Value
- 7%e0
- Qualifier
- Veg7 + Rep7 + Grain7 stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Under Veg7 + Rep7 + Grain7 stress, OSA fertiliser increased rice vigour through increases in internode length, lumen diameters and cross-section modulus by 7%, 18% and 18%, respectively”
Claim · model-written summary
Under three-stage seven-day stress OSA increased lumen diameters by 18%.
- Taxon
- riceOryza sativat0
- Treatment
- OSA fertilisere0
- Outcome
- lumen diameterse0
- Direction
- increasese0
- Value
- 18%e0
- Qualifier
- Veg7 + Rep7 + Grain7 stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Under Veg7 + Rep7 + Grain7 stress, OSA fertiliser increased rice vigour through increases in internode length, lumen diameters and cross-section modulus by 7%, 18% and 18%, respectively”
Claim · model-written summary
Under three-stage seven-day stress OSA increased cross-section modulus by 18%.
- Taxon
- riceOryza sativat0
- Treatment
- OSA fertilisere0
- Outcome
- cross-section moduluse0
- Direction
- increasese0
- Value
- 18%e0
- Qualifier
- Veg7 + Rep7 + Grain7 stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Under Veg7 + Rep7 + Grain7 stress, OSA fertiliser increased rice vigour through increases in internode length, lumen diameters and cross-section modulus by 7%, 18% and 18%, respectively”
Claim · model-written summary
OSA increased culm wall thickness by 20% under vegetative and reproductive stress.
- Taxon
- riceOryza sativat0
- Treatment
- Veg10 + Rep10 stresse0
- Outcome
- culm wall thicknesse0
- Direction
- increasede0
- Value
- 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“under Veg10 + Rep10 stress, culm wall thickness was increased by 20%”
Claim · model-written summary
Veg10 + Rep10 stress most strongly reduced lodging traits.
- Taxon
- riceOryza sativat0
- Treatment
- Veg10 + Rep10 stresse0
- Outcome
- LTse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Veg10 + Rep10 stress caused the most significant reduction in all LTs”
Claim · model-written summary
Veg10 + Rep10 stress gave the lowest lodging index of 0.32.
- Taxon
- riceOryza sativat0
- Outcome
- lodging indexe0
- Direction
- loweste0
- Value
- 0.32e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“lowest lodging index (LI, 0.32) attributed to reduced PW and GY”
Claim · model-written summary
Moroberekan combined higher grain yield with average lodging index of 0.40 across stress conditions.
- Taxon
- riceOryza sativat0
- Material
- Moroberekane0
- Outcome
- GYe0
- Direction
- highere0
- Qualifier
- average LI (0.40) across the stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“Moroberekan combined higher GY with average LI (0.40) across the stress conditions”
Claim · model-written summary
NERICA 1 had the lowest lodging index, 0.34.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“NERICA 1 had the lowest LI (0.34) attributed mainly to its short height”
Claim · model-written summary
OSA can enhance lodging resistance under two water deficit regimens.
- Taxon
- riceOryza sativat0
- Treatment
- OSA fertilisere0
- Outcome
- resistance to lodginge0
- Qualifier
- Veg10 + Rep10 and Veg7 + Rep7 + Grain7 stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice cultivars”
e0“resistance to lodging under Veg10 + Rep10 and Veg7 + Rep7 + Grain7 stresses can be enhanced with OSA fertiliser”
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