Abstract
Iron (Fe) toxicity is a widespread nutrient disorder and limit to grain yield in lowland rice. As it is, however, sometimes associated with deficiency of other nutrients, Fe toxicity might be also managed and alleviated by applications of concerned nutrients such as potassium (K) and zinc (Zn). However, the information on this topic available in literature is very limited, especially in the case of Zn. The objective of this study was to evaluate the effects of soil and foliar Zn applications on severity of Fe toxicity and grain concentrations of Zn in rice grown on a Fe-toxic soil in Laos under field conditions. Soil Zn applications have been realized in 2 forms: 1.5 % Zn-containing KCl (KCl-Zn) and ZnSO4. The results with soil Zn applications showed that plant growth at early growth stage was increased by both forms of Zn applications which in turn contributed to final grain yield. The increases in grain yield resulted from the KCl-Zn and ZnSO4 applications were similar and were around 35 % compared to the control treatment without any Zn application. Leaf Zn concentrations were also increased by Zn applications while Fe concentrations tended to decrease. In a separate experiment soil and foliar applications of ZnSO4 were examined for their effectiveness in affecting plant Zn concentration. Soil Zn application was not affective in increasing grain Zn concentration, but foliar-applied Zn increased Zn concentration of brown rice up to 34 %. This study suggested that Zn fertilizer strategy is a promising approach to contribute to both grain yield and grain Zn concentrations in rice under Fe toxic soil conditions.
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Claims 8
Claim · model-written summary
Both forms of soil zinc increased rice growth at the early stage.
- Taxon
- Rice
Oryza sativat0 - Organ / stage
- early growth stagee0
- Treatment
- both forms of Zn applicationse0
- Outcome
- plant growthe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant growth at early growth stage was increased by both forms of Zn applications”
t0“Rice”
Claim · model-written summary
KCl-Zn increased grain yield around 35% versus no zinc.
- Taxon
- RiceOryza sativat0
- Treatment
- KCl-Zne0
- Outcome
- grain yielde0
- Direction
- increasese0
- Value
- around 35 %e0
- Comparator
- control treatment without any Zn applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in grain yield resulted from the KCl-Zn and ZnSO4 applications were similar and were around 35 % compared to the control treatment without any Zn application.”
t0“Rice”
Claim · model-written summary
ZnSO4 increased grain yield around 35% versus no zinc.
- Taxon
- RiceOryza sativat0
- Treatment
- ZnSO4e0
- Outcome
- grain yielde0
- Direction
- increasese0
- Value
- around 35 %e0
- Comparator
- control treatment without any Zn applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increases in grain yield resulted from the KCl-Zn and ZnSO4 applications were similar and were around 35 % compared to the control treatment without any Zn application.”
t0“Rice”
Claim · model-written summary
Zinc application increased leaf zinc concentration.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn applicationse0
- Outcome
- Leaf Zn concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf Zn concentrations were also increased by Zn applications while Fe concentrations tended to decrease.”
t0“Rice”
Claim · model-written summary
Zinc application tended to decrease leaf iron concentration.
- Taxon
- RiceOryza sativat0
- Treatment
- Zn applicationse0
- Outcome
- Fe concentrationse0
- Direction
- decreasee0
- Qualifier
- tendede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf Zn concentrations were also increased by Zn applications while Fe concentrations tended to decrease.”
t0“Rice”
Claim · model-written summary
Soil zinc did not increase grain zinc concentration.
- Taxon
- RiceOryza sativat0
- Treatment
- Soil Zn applicatione0
- Outcome
- grain Zn concentratione0
- Direction
- not affective in increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil Zn application was not affective in increasing grain Zn concentration”
t0“Rice”
Claim · model-written summary
Foliar zinc increased brown rice zinc concentration up to 34%.
- Taxon
- RiceOryza sativat0
- Treatment
- foliar-applied Zne0
- Outcome
- Zn concentration of brown ricee0
- Direction
- increasede0
- Value
- up to 34 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar-applied Zn increased Zn concentration of brown rice up to 34 %.”
t0“Rice”
Claim · model-written summary
The authors suggested zinc fertilization to support both grain yield and zinc concentration under iron toxicity.
- Taxon
- riceOryza sativae0
- Outcome
- Zn fertilizer strategye0
- Qualifier
- under Fe toxic soil conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This study suggested that Zn fertilizer strategy is a promising approach to contribute to both grain yield and grain Zn concentrations in rice under Fe toxic soil conditions.”
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