Abstract
The residual values of zinc sulfate and acidifying (elemental) sulfur (S) for rice on Cununurra clay were investigated at Kimberley Research Station, near Kununurra in the Ord Irrigation Area, Western Australia. Successive crops were grown on 2 sites showing different degrees of zinc (Zn) deficiency according to visual symptoms. Despite the marked response to Zn fertiliser shown by the first crop of IR665-24-1 rice on the more deficient site (previously fallow for 12 months) there was no significant yield response to applied Zn in the third crop. On the less Zn deficient site (previously under weeds for several years), IR661-1-170-1-3 rice showed no response to Zn fertiliser although transient symptoms occurred in the first and second crops. Continuous cropping per se apparently reduced the severity of Zn deficiency on both sites, thus negating attempts to estimate the residual value of Zn fertiliser. The 2 sites were not distinguishable by the EDTAammonium carbonate soil test for Zn. Extractable Zn increased with increasing level of Zn fertiliser, but plant response was not related to extractable Zn. Application of elemental S (1-4 t ha-1) had no effect on extractable Zn levels before sowing of rice. Increased rice yields due to acidifying S were confirmed, but the residual effects did not extend beyond the fourth crop. In each of the 3 seasons following S application, the yield of IR661-1-170-1-3 increased by 0.3-0.6 t ha-1 but, at current prices, the use of S as a soil ameliorant for rice in the Ord Irrigation Area would be uneconomic.
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Claims 13
Claim · model-written summary
The first IR665-24-1 crop responded markedly to Zn fertilizer on the more deficient site.
- Taxon
- rice
Oryza sativat0 - Material
- IR665-24-1e0
- Treatment
- Zn fertilisere0
- Outcome
- response to Zn fertilisere0
- Qualifier
- more deficient sitee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“marked response to Zn fertiliser shown by the first crop of IR665-24-1 rice on the more deficient site”
Claim · model-written summary
The third rice crop on the more deficient site had no significant yield response to applied Zn.
- Taxon
- riceOryza sativat0
- Treatment
- applied Zne0
- Outcome
- yield responsee0
- Direction
- no significante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“there was no significant yield response to applied Zn in the third crop”
Claim · model-written summary
IR661-1-170-1-3 rice showed no response to Zn fertilizer on the less deficient site.
- Taxon
- riceOryza sativat0
- Material
- IR661-1-170-1-3e0
- Treatment
- Zn fertilisere0
- Outcome
- response to Zn fertilisere0
- Direction
- no responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“IR661-1-170-1-3 rice showed no response to Zn fertiliser although transient symptoms occurred in the first and second crops”
Claim · model-written summary
Transient Zn deficiency symptoms occurred in the first and second crops.
- Taxon
- riceOryza sativat0
- Outcome
- transient symptomse0
- Qualifier
- first and second cropse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“transient symptoms occurred in the first and second crops”
Claim · model-written summary
Continuous cropping apparently reduced Zn deficiency severity on both sites.
- Taxon
- riceOryza sativat0
- Treatment
- Continuous croppinge0
- Outcome
- severity of Zn deficiencye0
- Direction
- reducede0
- Qualifier
- on both sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Continuous cropping per se apparently reduced the severity of Zn deficiency on both sites”
Claim · model-written summary
The soil Zn test did not distinguish the two sites.
- Taxon
- riceOryza sativat0
- Outcome
- not distinguishablee0
- Comparator
- 2 sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“The 2 sites were not distinguishable by the EDTAammonium carbonate soil test for Zn”
Claim · model-written summary
Extractable Zn increased with Zn fertilizer level.
- Taxon
- riceOryza sativat0
- Treatment
- Zn fertilisere0
- Outcome
- Extractable Zne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Extractable Zn increased with increasing level of Zn fertiliser”
Claim · model-written summary
Plant response was not related to extractable Zn.
- Taxon
- riceOryza sativat0
- Compound
- extractable Zne0
- Outcome
- plant responsee0
- Direction
- not relatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“plant response was not related to extractable Zn”
Claim · model-written summary
Elemental S had no effect on extractable Zn before rice sowing.
- Taxon
- riceOryza sativat0
- Treatment
- elemental S (1-4 t ha-1)e0
- Outcome
- extractable Zn levelse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Application of elemental S (1-4 t ha-1) had no effect on extractable Zn levels before sowing of rice”
Claim · model-written summary
Acidifying S increased rice yield.
- Taxon
- riceOryza sativat0
- Treatment
- acidifying Se0
- Outcome
- rice yieldse0
- Direction
- Increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“Increased rice yields due to acidifying S were confirmed”
Claim · model-written summary
The residual benefit of acidifying S ended by the fourth crop.
- Taxon
- riceOryza sativat0
- Outcome
- residual effectse0
- Direction
- did not extende0
- Qualifier
- beyond the fourth crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“the residual effects did not extend beyond the fourth crop”
Claim · model-written summary
In each of three seasons after S application, IR661-1-170-1-3 yield increased by 0.3-0.6 t ha-1.
- Taxon
- riceOryza sativat0
- Material
- IR661-1-170-1-3e0
- Treatment
- S applicatione0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 0.3-0.6 t ha-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“In each of the 3 seasons following S application, the yield of IR661-1-170-1-3 increased by 0.3-0.6 t ha-1”
Claim · model-written summary
At current prices, elemental S was considered uneconomic as a soil ameliorant for rice in the Ord Irrigation Area.
- Taxon
- riceOryza sativat0
- Outcome
- use of S as a soil ameliorant for rice in the Ord Irrigation Area would be uneconomice0
- Setting
- Ord Irrigation Areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice”
e0“at current prices, the use of S as a soil ameliorant for rice in the Ord Irrigation Area would be uneconomic”
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