Abstract
Rainfed lowlands account for one-third of the total rice land in tropical Asia. Rice production is often constrained by low nitrogen (N) and phosphorus (P) availability under rainfed lowland conditions. Genotypes with root phenotypic plasticity to fertilizer management may be advantageous for nutrient uptake and crop growth in rainfed lowlands. To test our hypothesis, we conducted a two-year field experiment in northeastern Thailand. Three genotypes (two advanced backcross lines and the recipient) with contrasting root morphologies were grown under sufficient and limited N and P fertilizers (four treatments). Without any drought symptoms throughout the experimental period, the average grain yield across years, treatments, and genotypes was 3.58 t ha -1 . sufficient N application significantly increased grain yield, shoot biomass, and N uptake in both years; however, it reduced root length density. In contrast, the effect of sufficient P application was unclear, with a significant increase in P uptake observed only in the second year. At the panicle initiation stage, one advanced backcross line demonstrated a higher root length density in subsoil (10–30 cm) and higher P uptake. The positive correlation between root length density (0–30 cm) and P uptake suggests that greater root proliferation enhances P acquisition in rainfed lowlands. Furthermore, genotypic differences in rhizosphere effects may have contributed to improved P solubilization in the topsoil, and N management may have altered root plasticity. These findings emphasize the importance of root traits in improving N and P use efficiency in rainfed lowlands and offer insights for rice breeding in drought-prone environments.
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 9
Claim · model-written summary
Mean rice grain yield was 3.58 t ha -1 across years, treatments and genotypes.
- Taxon
- rice
Oryza sativat0 - Outcome
- grain yielde0
- Value
- 3.58 t ha -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average grain yield across years, treatments, and genotypes was 3.58 t ha -1”
t0“rice”
Claim · model-written summary
Sufficient N increased grain yield, shoot biomass and N uptake.
- Taxon
- riceOryza sativat0
- Treatment
- sufficient N applicatione0
- Outcome
- grain yield, shoot biomass, and N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sufficient N application significantly increased grain yield, shoot biomass, and N uptake in both years”
t0“rice”
Claim · model-written summary
Sufficient N reduced root length density.
- Taxon
- riceOryza sativat0
- Treatment
- nitrogent0
- Outcome
- root length densitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“however, it reduced root length density”
t0“Root plasticity and nutrient uptake in rainfed lowland rice under nitrogen and phosphorus fertilizer management”
Claim · model-written summary
Sufficient P increased P uptake only in year two.
- Taxon
- riceOryza sativat0
- Treatment
- phosphorus fertilizert0
- Outcome
- P uptakee0
- Direction
- increasee0
- Qualifier
- only in the second yeare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase in P uptake observed only in the second year”
t0“Root plasticity and nutrient uptake in rainfed lowland rice under nitrogen and phosphorus fertilizer management”
Claim · model-written summary
One advanced backcross line had higher subsoil root length density.
- Taxon
- riceOryza sativat0
- Material
- one advanced backcross linee0
- Organ / stage
- subsoile0
- Outcome
- root length densitye0
- Direction
- highere0
- Value
- 10–30 cme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one advanced backcross line demonstrated a higher root length density in subsoil (10–30 cm)”
t0“rice”
Claim · model-written summary
One advanced backcross line had higher P uptake.
- Taxon
- riceOryza sativat0
- Material
- one advanced backcross linee0
- Outcome
- P uptakee0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one advanced backcross line demonstrated a higher root length density in subsoil (10–30 cm) and higher P uptake”
t0“rice”
Claim · model-written summary
Root length density correlated positively with P uptake.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive correlation between root length density (0–30 cm) and P uptake”
t0“rice”
Claim · model-written summary
Genotypic rhizosphere differences may have improved topsoil P solubilization.
- Taxon
- riceOryza sativat0
- Outcome
- P solubilizatione0
- Qualifier
- rhizosphere effectse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“genotypic differences in rhizosphere effects may have contributed to improved P solubilization in the topsoil”
t0“rice”
Claim · model-written summary
N management may have altered root plasticity.
- Taxon
- riceOryza sativat0
- Treatment
- N managemente0
- Outcome
- root plasticitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N management may have altered root plasticity”
t0“rice”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
108 papers in the same direction as this paper · 402 in the opposite direction
- positive
- positive
- positive
507 papers more in this group
See all 511 papers →fertilization · nutrient: content · Oryza sativa (rice)Positive and negative results
931 papers in the same direction as this paper · 56 in the opposite direction · 5 reporting no difference from an alternative
- negative
- no effect
- no effect
989 papers more in this group
See all 993 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
- negative
- negative
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.