Abstract
Ratooning of rice ( Oryza satira L.) may be agronomically possible in climates where the crop season is to short too produce two rice crops, but factors influencing ratoon rice yields are not well understood. The influence of main crop total nonstructural carbohydrate (TNC) and main crop N topdfessing on ratoon crop yield of four contrasting field‐grown riee cultivars were evaluated in Texas during 1988 and 1989. Allowing panicles to develop normally or removing the upper two‐thirds of each main crop panicle 10 d after initial main crop heading created a range in TNC of the culm and leaves during later stages of main crop development for determining TNC effects on ratooning. Nitrogen applied 10 d after initial main crop heading corrected, any possible N deficiency, but did not increase main crop yield, TNC, or ratoon crop yield, indicating no benefits to N applied immediately after main crop heading. During main crop grain filling, culm and leaf TNC levels of plants with normal panicles decreased to low levels (0‐90 g kg ‐1 ), then gradually increased and ranged from 40 to 170 g kg ‐1 at harvest. In contrast, TNC in culms and leaves of plants with incomplete panicles gradually increased during main crop grain filling reaching 140 to 310 g kg ‐1 at main crop harvest. Main crop plants with elevated TNC levels produced ratoon yields up to 5.3 Mg ha ‐1 , averaging 48 and 33% higher than plants with low TNC at main crop harvest in 1988 and 1989, respectively. These data illustrate a moderate positive correlation ( R 2 = 0.66) between ratoon yields and TNC in cuim and leaves at main crop harvest for effects due to years, panicle removal, and cultivars.
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Claims 8
Claim · model-written summary
Nitrogen after heading did not increase main crop yield, TNC, or ratoon yield.
- Taxon
- Rice
Oryza sativat0 - Treatment
- Nitrogen applied 10 d after initial main crop headinge0
- Outcome
- main crop yield, TNC, or ratoon crop yielde0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen applied 10 d after initial main crop heading corrected, any possible N deficiency, but did not increase main crop yield, TNC, or ratoon crop yield”
t0“Rice”
Claim · model-written summary
Culm and leaf TNC declined to 0‐90 g kg ‐1 during grain filling with normal panicles.
- Taxon
- RiceOryza sativat0
- Organ / stage
- culm and leafe0
- Outcome
- TNC levelse0
- Direction
- decreasede0
- Value
- 0‐90 g kg ‐1e0
Not reportedMaterial
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“culm and leaf TNC levels of plants with normal panicles decreased to low levels (0‐90 g kg ‐1 )”
t0“Rice”
Claim · model-written summary
Culm and leaf TNC later rose to 40 to 170 g kg ‐1 at harvest with normal panicles.
- Taxon
- RiceOryza sativat0
- Outcome
- ranged from 40 to 170 g kg ‐1 at harveste0
- Direction
- increasede0
- Value
- 40 to 170 g kg ‐1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“then gradually increased and ranged from 40 to 170 g kg ‐1 at harvest”
t0“Rice”
Claim · model-written summary
TNC in culms and leaves with incomplete panicles increased to 140 to 310 g kg ‐1 at harvest.
- Taxon
- RiceOryza sativat0
- Treatment
- incomplete paniclese0
- Outcome
- TNC in culms and leavese0
- Direction
- increasede0
- Value
- 140 to 310 g kg ‐1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“TNC in culms and leaves of plants with incomplete panicles gradually increased during main crop grain filling reaching 140 to 310 g kg ‐1 at main crop harvest”
t0“Rice”
Claim · model-written summary
Plants with elevated TNC produced ratoon yields up to 5.3 Mg ha ‐1.
- Taxon
- RiceOryza sativat0
- Outcome
- ratoon yieldse0
- Value
- 5.3 Mg ha ‐1e0
- Qualifier
- elevated TNC levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Main crop plants with elevated TNC levels produced ratoon yields up to 5.3 Mg ha ‐1”
t0“Rice”
Claim · model-written summary
Elevated TNC was associated with 48% higher ratoon yield in 1988 than low TNC.
- Taxon
- RiceOryza sativat0
- Outcome
- highere0
- Direction
- highere0
- Value
- 48e0
- Comparator
- plants with low TNCe0
- Setting
- 1988e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“averaging 48 and 33% higher than plants with low TNC at main crop harvest in 1988 and 1989, respectively”
t0“Rice”
Claim · model-written summary
Elevated TNC was associated with 33% higher ratoon yield in 1989 than low TNC.
- Taxon
- RiceOryza sativat0
- Outcome
- highere0
- Direction
- highere0
- Value
- 33%e0
- Comparator
- plants with low TNCe0
- Setting
- 1989e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“averaging 48 and 33% higher than plants with low TNC at main crop harvest in 1988 and 1989, respectively”
t0“Rice”
Claim · model-written summary
Ratoon yield and culm and leaf TNC at main crop harvest had a moderate positive correlation, R2 = 0.66.
- Taxon
- RiceOryza sativat0
- Organ / stage
- cuim and leavese0
- Outcome
- ratoon yieldse0
- Value
- R 2 = 0.66e0
- Qualifier
- TNC in cuim and leaves at main crop harveste0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate positive correlation ( R 2 = 0.66) between ratoon yields and TNC in cuim and leaves at main crop harvest”
t0“Rice”
The same questions in other papers
nitrogen · quality: sugar starch · Oryza sativa (rice)Positive and negative results
16 papers in the same direction as this paper · 40 in the opposite direction
- negative
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See all 57 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.