Abstract
Abstract A field experiment was conducted on an Aerie Haplaquept soil to study the effect of phosphorus (P) deficiency in soil on the P nutrition and yield of five modern varieties of rice, viz., Purbachi, BR1, BR3, BR14, and BR29, popular with the rice farmers of Bangladesh. Soil‐available P in the different plots of the experimental field varied widely, from 2.8 to 16.4 ppm. This plot to plot variation in soil‐available P content resulted from differences in the total amounts (0 to 480 kg ha‐1) of P the plots had received over a period of 8 years in a long‐term P fertilizer trial conducted previously in the same field. Phosphorus deficiency in soil drastically reduced the grain yield of all the rice varieties. In severely P deficient plots, where soil‐available P was around 3 ppm, the yield was less than 1 ton ha‐1 while in plots containing an adequate P level, i.e., >6 ppm, the yield was more than 41 ha‐1. Rice yield increased linearly with an increase in soil P content up to 6 ppm, and the highest grain yield for any variety, obtained at 6–7 ppm of soil‐available P leveled off at this point. Soil P deficiency not only decreased rice yield severely but also decreased P content in straw and grain drastically. However, differences among rice varieties were noted in P nutrition, particularly at low soil P levels. The rice varieties differed markedly also in respect of internal P efficiency. The BR29 showed the highest internal P efficiency both at low and high soil P levels. In all the rice varieties, internal P efficiency decreased with an increase in soil P levels.
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Claims 10
Claim · model-written summary
Phosphorus deficiency in soil drastically reduced the grain yield of all five rice varieties.
- Taxon
- rice
Oryza sativae0 - Treatment
- Phosphorus deficiency in soile0
- Outcome
- grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus deficiency in soil drastically reduced the grain yield of all the rice varieties”
Claim · model-written summary
In severely P-deficient plots with about 3 ppm soil-available P, rice yield was less than 1 ton per hectare.
- Taxon
- riceOryza sativat0
- Outcome
- yielde0
- Direction
- less thane0
- Value
- 1 ton ha‐1e0
- Qualifier
- soil‐available P was around 3 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In severely P deficient plots, where soil‐available P was around 3 ppm, the yield was less than 1 ton ha‐1”
t0“lowland rice varieties”
Claim · model-written summary
In plots with an adequate P level (above 6 ppm), rice yield was more than 4 t per hectare (reported as 41 ha-1).
- Taxon
- riceOryza sativat0
- Outcome
- yielde0
- Direction
- more thane0
- Value
- 41 ha‐1e0
- Qualifier
- adequate P level, i.e., >6 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in plots containing an adequate P level, i.e., >6 ppm, the yield was more than 41 ha‐1”
t0“lowland rice varieties”
Claim · model-written summary
Rice yield increased linearly with soil P content up to 6 ppm.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yield increased linearly with an increase in soil P content up to 6 ppm”
Claim · model-written summary
The highest grain yield of any variety was obtained at 6-7 ppm soil-available P and leveled off at this point.
- Taxon
- riceOryza sativat0
- Outcome
- highest grain yielde0
- Direction
- leveled offe0
- Value
- 6–7 ppm of soil‐available Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest grain yield for any variety, obtained at 6–7 ppm of soil‐available P leveled off at this point”
t0“lowland rice varieties”
Claim · model-written summary
Soil P deficiency decreased P content in rice straw and grain drastically.
- Taxon
- riceOryza sativae0
- Treatment
- Soil P deficiencye0
- Outcome
- P content in straw and graine0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil P deficiency not only decreased rice yield severely but also decreased P content in straw and grain drastically”
Claim · model-written summary
Rice varieties differed in P nutrition, particularly at low soil P levels.
- Taxon
- riceOryza sativae0
- Outcome
- P nutritione0
- Qualifier
- particularly at low soil P levelse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences among rice varieties were noted in P nutrition, particularly at low soil P levels”
Claim · model-written summary
The rice varieties differed markedly in internal P efficiency.
- Taxon
- riceOryza sativae0
- Outcome
- internal P efficiencye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rice varieties differed markedly also in respect of internal P efficiency”
Claim · model-written summary
Variety BR29 showed the highest internal P efficiency at both low and high soil P levels.
- Taxon
- riceOryza sativat0
- Material
- BR29e0
- Outcome
- internal P efficiencye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BR29 showed the highest internal P efficiency both at low and high soil P levels”
t0“lowland rice varieties”
Claim · model-written summary
In all rice varieties, internal P efficiency decreased as soil P levels increased.
- Taxon
- riceOryza sativae0
- Treatment
- increase in soil P levelse0
- Outcome
- internal P efficiencye0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all the rice varieties, internal P efficiency decreased with an increase in soil P levels”
The same questions in other papers
phosphorus · nutrient: content · Oryza sativa (rice)Positive and negative results
141 papers in the same direction as this paper · 25 in the opposite direction · 1 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- no effect
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See all 168 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
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- positive
- positive
471 papers more in this group
See all 475 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.