Abstract
Concern over the food chain transfer of zinc (Zn) is increasing because of its importance in human health. A field experiment was conducted on a low Zn soil to determine the effect of different Zn fertilization strategies on grain Zn concentration and Zn allocation in different plant tissues of rice. Six treatments were used: (1) no Zn fertilization; (2) soil fertilization at transplanting; (3) Zn soil fertilization at transplanting and flowering; (4) foliar application during grain filling; (5) foliar applications during tillering, flowering, and grain filling; and (6) combination of treatments 3 and 5. Zn fertilization significantly increased Zn concentration in brown rice. The largest effect on grain Zn was observed by combination of soil and foliar applications. The increase in brown rice was much smaller (20%) than the increase in the vegetative parts (100%), indicating that grain Zn concentration of rice is not strongly increased by Zn fertilization. More increased Zn by Zn fertilization was allocated into straw not into grain. From the perspective of human nutrition, it seems that there is too little scope to enhance Zn concentration in rice by fertilization alone. the major bottleneck to increase Zn concentration in rice grain seems to be internal translocation/retranslocation of Zn from shoot to panicle or from rachis to grain, rather than root uptake of Zn from the soil.
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Claims 7
Claim · model-written summary
Zinc fertilization significantly increased zinc concentration in brown rice.
- Taxon
- rice
Oryza sativae0 - Treatment
- Zn fertilizatione0
- Outcome
- Zn concentration in brown ricee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn fertilization significantly increased Zn concentration in brown rice.”
Claim · model-written summary
Combined soil and foliar applications produced the largest effect on grain zinc.
- Taxon
- RiceOryza sativat0
- Treatment
- combination of soil and foliar applicationse0
- Outcome
- grain Zne0
- Direction
- largest effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The largest effect on grain Zn was observed by combination of soil and foliar applications.”
t0“Rice”
Claim · model-written summary
Zinc fertilization raised brown rice zinc by 20%, less than vegetative zinc.
- Taxon
- riceOryza sativae0
- Treatment
- Zn fertilizatione0
- Outcome
- brown ricee0
- Direction
- increasee0
- Value
- 20%e0
- Comparator
- vegetative partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in brown rice was much smaller (20%) than the increase in the vegetative parts (100%), indicating that grain Zn concentration of rice is not strongly increased by Zn fertilization.”
Claim · model-written summary
Zinc fertilization raised zinc in vegetative parts by 100%, more than in brown rice.
- Taxon
- riceOryza sativae0
- Treatment
- Zn fertilizatione0
- Outcome
- vegetative partse0
- Direction
- increasee0
- Value
- 100%e0
- Comparator
- brown ricee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in brown rice was much smaller (20%) than the increase in the vegetative parts (100%), indicating that grain Zn concentration of rice is not strongly increased by Zn fertilization.”
Claim · model-written summary
More additional zinc from fertilization was allocated to straw than grain.
- Taxon
- RiceOryza sativat0
- Organ / stage
- strawe0
- Treatment
- Zn fertilizatione0
- Outcome
- Zne0
- Direction
- Moree0
- Comparator
- graine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More increased Zn by Zn fertilization was allocated into straw not into grain.”
t0“Rice”
Claim · model-written summary
The authors judge fertilization alone to have little scope to improve rice zinc concentration.
- Taxon
- riceOryza sativae0
- Outcome
- too little scope to enhance Zn concentration in rice by fertilization alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From the perspective of human nutrition, it seems that there is too little scope to enhance Zn concentration in rice by fertilization alone.”
Claim · model-written summary
The authors identify internal zinc movement to the grain as the likely bottleneck.
- Taxon
- riceOryza sativae0
- Outcome
- Zn concentration in rice graine0
- Qualifier
- internal translocation/retranslocation of Zn from shoot to panicle or from rachis to graine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the major bottleneck to increase Zn concentration in rice grain seems to be internal translocation/retranslocation of Zn from shoot to panicle or from rachis to grain, rather than root uptake of Zn from the soil.”
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