Abstract
Straighthead is a ‘physiological’ disorder of rice, the symptoms being floret sterility, deformed florets and panicles and reduced grain yield. Straighthead in rice is difficult to investigate because of its unpredictable occurrence under field conditions. An experiment was conducted in south-eastern Australia in 1996 to investigate the effect of rate and timing of N fertilisation on growth and yield of rice. The presence of straighthead at this location gave a unique opportunity to study the influence of crop N status. This paper reports the influence of N application on straighthead symptoms during this experiment. A significant reduction of straighthead occurred with higher rates of N application. Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation. The reduction of straighthead at high nitrogen rates may be due to improved uptake of several essential nutrients, and Cu may be a critical nutrient. This study and earlier observations have shown the application of optimal levels of pre-flood nitrogen to achieve grain yields greater than 10 t/ha may reduce straighthead severity in the Australian rice-growing environment. The results in this paper are not presented as recommendations to growers but a contribution to the currently limited literature on straighthead in Australia.
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Claims 8
Claim · model-written summary
Higher rates of N application significantly reduced straighthead in rice.
- Taxon
- rice
Oryza sativae0 - Treatment
- higher rates of N applicatione1
- Outcome
- straightheade1
- Direction
- reductione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e1“A significant reduction of straighthead occurred with higher rates of N application”
Claim · model-written summary
250 kg N/ha applied pre-flood improved rice plant growth and vigour.
- Taxon
- riceOryza sativae0
- Treatment
- 250 kg N/ha pre-floode2
- Outcome
- plant growth and vigoure2
- Direction
- improvede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e2“Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation”
Claim · model-written summary
250 kg N/ha pre-flood increased uptake and accumulation of S, P and K in rice at panicle initiation.
- Taxon
- riceOryza sativae0
- Treatment
- 250 kg N/ha pre-floode2
- Outcome
- uptake and accumulation of S, P, Ke2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e2“Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation”
Claim · model-written summary
250 kg N/ha pre-flood increased uptake and accumulation of Mg, Cu and Mn in rice at panicle initiation.
- Taxon
- riceOryza sativae0
- Treatment
- 250 kg N/ha pre-floode2
- Outcome
- Mg, Cu, Mne2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e2“Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation”
Claim · model-written summary
250 kg N/ha pre-flood increased uptake and accumulation of Zn in rice at panicle initiation.
- Taxon
- riceOryza sativae0
- Treatment
- 250 kg N/ha pre-floode2
- Outcome
- Zne2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e2“Application of 250 kg N/ha pre-flood, improved plant growth and vigour with subsequent increased uptake and accumulation of S, P, K, Mg, Cu, Mn and Zn in the plant at panicle initiation”
Claim · model-written summary
The reduction of straighthead at high nitrogen rates may be due to improved uptake of several essential nutrients.
- Taxon
- riceOryza sativae0
- Treatment
- high nitrogen ratese3
- Outcome
- reduction of straightheade3
- Qualifier
- improved uptake of several essential nutrientse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e3“The reduction of straighthead at high nitrogen rates may be due to improved uptake of several essential nutrients, and Cu may be a critical nutrient”
Claim · model-written summary
Copper may be a critical nutrient in the reduction of straighthead in rice.
- Taxon
- riceOryza sativae0
- Compound
- Cue3
- Outcome
- reduction of straightheade3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“disorder of rice”
e3“The reduction of straighthead at high nitrogen rates may be due to improved uptake of several essential nutrients, and Cu may be a critical nutrient”
Claim · model-written summary
Optimal pre-flood nitrogen to reach grain yields above 10 t/ha may reduce straighthead severity in Australian rice.
- Taxon
- riceOryza sativae4
- Treatment
- optimal levels of pre-flood nitrogene4
- Outcome
- straighthead severitye4
- Direction
- reducee4
- Value
- greater than 10 t/hae4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the application of optimal levels of pre-flood nitrogen to achieve grain yields greater than 10 t/ha may reduce straighthead severity in the Australian rice-growing environment”
The same questions in other papers
nitrogen · nutrient: content · Oryza sativa (rice)Positive and negative results
408 papers in the same direction as this paper · 52 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- negative
460 papers more in this group
See all 464 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
- 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.