Abstract
Lowland or flooded rice is mainly responsible for about 76% of total rice production at global level, yet information on micronutrient requirements for this crop is limited. Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil, to determine requirements of zinc (Zn), copper (Cu), boron (B), molybdenum (Mo), manganese (Mn), and iron (Fe) for lowland rice grown on a Brazilian Inceptisol. The levels of micronutrients used were Zn (0, 10 20, 40, and 80 mg kg−1), Cu (0, 5, 10, 20, and 40 mg kg−1), B (0, 5, 10, 20, and 40 mg kg−1), Mo (0, 2, 4, 8, and 16 mg kg−1), Mn (0, 50, 100, 300, and 600 mg kg−1), and Fe (0, 250, 500, 1000, and 2000 mg kg−1). Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe. The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1. In addition to grain yield, plant height, straw yield, panicle density, and root growth of lowland rice were also improved with the addition of most of these micronutrients. Improvement in root growth has special significance in improving nutrient-use efficiency under nutrient-stress conditions. Micronutrient-use efficiency (grain yield per unit nutrient applied) was in the order of Cu > Zn > Mn > Fe > Mo > B.
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Claims 15
Claim · model-written summary
Zinc addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Zne1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
Copper addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Cue1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
Boron addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Be1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
Molybdenum addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Moe1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
Manganese addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Mne1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
Iron addition increased lowland rice grain yield in a quadratic fashion.
- Taxon
- lowland ricee2
- Treatment
- Fee1
- Outcome
- Grain yielde1
- Direction
- increasede1
- Qualifier
- in a quadratic fashione1
- Setting
- greenhousee3
Not reportedComparator
Verbatim
e1“Grain yield was significantly increased in a quadratic fashion with the addition of Zn, Cu, B, Mo, Mn, and Fe”
e2“lowland rice grown on a Brazilian Inceptisol”
e3“Six greenhouse experiments were conducted at the National Rice and Bean Research Center of EMBRAPA, Santo Antônio de Goiás, Brazil”
Claim · model-written summary
The adequate Zn rate for maximum lowland rice grain yield was 33 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
The adequate Cu rate for maximum lowland rice grain yield was 25 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
The adequate B rate for maximum lowland rice grain yield was 26 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
The adequate Mo rate for maximum lowland rice grain yield was 10 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
The adequate Mn rate for maximum lowland rice grain yield was 250 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
The adequate Fe rate for maximum lowland rice grain yield was 1269 mg kg−1.
Verbatim
e1“The adequate rates of micronutrients for maximum grain yield were Zn 33 mg kg−1, Cu 25 mg kg−1, B 26 mg kg−1, Mo 10 mg kg−1, Mn 250 mg kg−1, and Fe 1269 mg kg−1”
e2“lowland rice grown on a Brazilian Inceptisol”
Claim · model-written summary
Micronutrient addition improved plant height, straw yield and panicle density of lowland rice.
- Taxon
- lowland ricee1
- Treatment
- most of these micronutrientse1
- Outcome
- plant height, straw yield, panicle densitye1
- Direction
- improvede1
Not reportedComparator
Verbatim
e1“In addition to grain yield, plant height, straw yield, panicle density, and root growth of lowland rice were also improved with the addition of most of these micronutrients”
Claim · model-written summary
Micronutrient addition improved root growth of lowland rice.
Not reportedComparator
Verbatim
e1“In addition to grain yield, plant height, straw yield, panicle density, and root growth of lowland rice were also improved with the addition of most of these micronutrients”
Claim · model-written summary
Micronutrient-use efficiency of lowland rice followed the order Cu > Zn > Mn > Fe > Mo > B.
Verbatim
e1“Micronutrient-use efficiency (grain yield per unit nutrient applied) was in the order of Cu > Zn > Mn > Fe > Mo > B”
e2“lowland rice grown on a Brazilian Inceptisol”
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See all 15 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.