Abstract
SummaryGlasshouse nutrient omission trials are useful in identifying nutrient limitations for plant growth in soils under the same environmental conditions. Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.), and the crop often encounters water stress. Nutrient requirements may be modified when standing water disappears from the field. Two experiments with rice seedlings were conducted in a glasshouse at Ubon Rice Research Center, Thailand, to identify the nutrients which limit rice growth in soils of Northeast Thailand, and to determine whether nutrient limitations are affected by water availability. In Experiment 1, rice was grown on two soils (Roi et and Ubon series) under well-watered and water-limiting conditions, and 15 nutrient treatments were imposed. In Experiment 2, six soils from Northeast Thailand were examined using the same 15 nutrient treatments. The nutrients which clearly limited the growth of rice plants in soils of Northeast Thailand were nitrogen (N) and phosphorus (P). In some cases, potassium (K) and sulfur (S) also limited growth, and in one soil zinc (Zn) and boron (B) also limited growth. A shortage of N was the most important limitation for plant growth in all soils except one in which P was more important. The low supply of P decreased plant height and leaf area development during early growth ; low N supply had a greater effect later during growth. The omission of P had a larger detrimental effect on growth when water supply was limited. In the Roi et soil, the omission of S had a large effect on leaf area and total dry matter production only under water stress conditions, but this was not found in the other soils examined. These results from glasshouse studies show that the nutrients limiting rice growth depend on soil type and water availability in soils of Northeast Thailand.
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Claims 9
Claim · model-written summary
Nitrogen and phosphorus clearly limited rice growth in soils of Northeast Thailand.
- Taxon
- rice (Oryza sativa L.)
Oryza sativae0 - Compound
- nitrogen (N) and phosphorus (P)e1
- Outcome
- growthe1
- Direction
- limitede1
- Setting
- soils of Northeast Thailande1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e1“The nutrients which clearly limited the growth of rice plants in soils of Northeast Thailand were nitrogen (N) and phosphorus (P)”
Claim · model-written summary
Nitrogen was the most important limitation for plant growth in most soils.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Compound
- Ne3
- Outcome
- most important limitation for plant growthe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e3“A shortage of N was the most important limitation for plant growth in all soils except one in which P was more important”
Claim · model-written summary
Low phosphorus supply decreased plant height and leaf area development during early growth.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Organ / stage
- early growthe4
- Treatment
- low supply of Pe4
- Outcome
- plant height and leaf area developmente4
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e4“The low supply of P decreased plant height and leaf area development during early growth”
Claim · model-written summary
Low nitrogen supply had a greater effect on rice growth later in growth.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Organ / stage
- later during growthe5
- Treatment
- low N supplye5
- Outcome
- growthe5
- Direction
- greatere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e5“low N supply had a greater effect later during growth”
Claim · model-written summary
Omission of phosphorus had a larger detrimental effect on rice growth when water supply was limited.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Treatment
- omission of Pe6
- Outcome
- growthe6
- Direction
- larger detrimental effecte6
- Qualifier
- when water supply was limitede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e6“The omission of P had a larger detrimental effect on growth when water supply was limited”
Claim · model-written summary
In the Roi et soil, omission of sulfur had a large effect on leaf area and dry matter only under water stress.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Treatment
- omission of Se7
- Outcome
- leaf area and total dry matter productione7
- Direction
- large effecte7
- Qualifier
- only under water stress conditionse7
- Setting
- Roi et soile7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e7“In the Roi et soil, the omission of S had a large effect on leaf area and total dry matter production only under water stress conditions”
Claim · model-written summary
The nutrients limiting rice growth depend on soil type and water availability.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Outcome
- nutrients limiting rice growthe2
- Qualifier
- depend on soil type and water availabilitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e2“These results from glasshouse studies show that the nutrients limiting rice growth depend on soil type and water availability in soils of Northeast Thailand”
Claim · model-written summary
Potassium and sulfur also limited rice growth in some cases.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Compound
- potassium (K) and sulfur (S)e2
- Outcome
- growthe2
- Qualifier
- In some casese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e2“In some cases, potassium (K) and sulfur (S) also limited growth, and in one soil zinc (Zn) and boron (B) also limited growth”
Claim · model-written summary
Zinc and boron also limited rice growth in one soil.
- Taxon
- rice (Oryza sativa L.)Oryza sativae0
- Compound
- zinc (Zn) and boron (B)e2
- Outcome
- growthe2
- Qualifier
- in one soile2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soils of low fertility are commonly used for production of rainfed lowland rice (Oryza sativa L.)”
e2“In some cases, potassium (K) and sulfur (S) also limited growth, and in one soil zinc (Zn) and boron (B) also limited growth”
The same questions in other papers
nitrogen · growth · Oryza sativa (rice)Positive and negative results
401 papers in the same direction as this paper · 101 in the opposite direction · 8 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- negative
- negative
- negative
507 papers more in this group
See all 511 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.