Abstract
This study determined how nitrogen (N) fertilizer and water management affect grain yield and milling quality of 9 modern rice varieties with long, slender grain in two field experiments. The effect of N on rice grown in wetland culture was evaluated at 0, 60 and 120 kg N ha 1 . In a second experiment the rice in aerobic and wetland culture were compared. The rice in both experiments were grown to maturity and evaluated for yield, head rice yield and chalkiness. Grain yield increased with increasing N application, head rice yield increased with increasing N in 8 varieties, while chalkiness was more than halved in 7 varieties. Grain N also increased with increasing N fertilizer, but high head rice yield in several varieties was associated with relatively low grain N. Under aerobic cultivation, all 9 varieties yielded less than in wetland culture, the head rice yield was lower and chalkiness was higher except in 2 varieties. In both experiments, grain yield was associated positively with head rice yield and negatively with chalkiness. Head rice yield and chalkiness were negatively associated in the water experiment but not in the N experiment. This study has shown that modern high yielding rice varieties generally respond positively to nitrogen fertilizer in better milling quality as well as in yield. Grain chalkiness of the varieties was more stable against variation in the environment than head rice yield.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Grain yield increased with increasing nitrogen application.
- Taxon
- rice
Oryza sativat0 - Treatment
- N applicatione0
- Outcome
- Grain yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield increased with increasing N application”
t0“Rice Varieties”
Claim · model-written summary
Head rice yield increased with increasing nitrogen in eight varieties.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“head rice yield increased with increasing N in 8 varieties”
Claim · model-written summary
Chalkiness was more than halved in seven varieties with increasing nitrogen.
- Taxon
- riceOryza sativat0
- Outcome
- chalkinesse0
- Direction
- more than halvede0
- Value
- 7 varietiese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while chalkiness was more than halved in 7 varieties”
t0“Rice Varieties”
Claim · model-written summary
Grain nitrogen increased with increasing nitrogen fertilizer.
- Taxon
- riceOryza sativat0
- Treatment
- N fertilizere0
- Outcome
- Grain Ne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain N also increased with increasing N fertilizer”
t0“Rice Varieties”
Claim · model-written summary
High head rice yield in several varieties was associated with relatively low grain nitrogen.
- Taxon
- riceOryza sativae0
- Organ / stage
- graine0
- Outcome
- head rice yielde0
- Direction
- highe0
- Qualifier
- relatively low grain Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high head rice yield in several varieties was associated with relatively low grain N”
Claim · model-written summary
All nine varieties yielded less under aerobic cultivation than wetland culture.
- Taxon
- riceOryza sativat0
- Treatment
- aerobic cultivatione0
- Outcome
- yieldede0
- Direction
- lesse0
- Value
- 9 varietiese0
- Comparator
- wetland culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under aerobic cultivation, all 9 varieties yielded less than in wetland culture”
t0“Rice Varieties”
Claim · model-written summary
Head rice yield was lower under aerobic than wetland cultivation.
- Taxon
- riceOryza sativae0
- Outcome
- head rice yielde0
- Direction
- lowere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the head rice yield was lower”
Claim · model-written summary
Chalkiness was higher under aerobic cultivation except in two varieties.
- Taxon
- riceOryza sativat0
- Outcome
- chalkinesse0
- Direction
- highere0
- Qualifier
- except in 2 varietiese0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chalkiness was higher except in 2 varieties”
t0“Rice Varieties”
Claim · model-written summary
Grain yield was positively associated with head rice yield in both experiments.
- Taxon
- riceOryza sativae0
- Outcome
- grain yielde0
- Direction
- positivelye0
- Comparator
- head rice yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield was associated positively with head rice yield”
Claim · model-written summary
Grain yield was negatively associated with chalkiness in both experiments.
- Taxon
- riceOryza sativat0
- Outcome
- chalkinesse0
- Direction
- negativelye0
Not reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“and negatively with chalkiness”
t0“Rice Varieties”
Claim · model-written summary
Head rice yield and chalkiness were negatively associated in the water experiment but not the nitrogen experiment.
- Taxon
- riceOryza sativae0
- Treatment
- water experimente0
- Outcome
- Head rice yield and chalkinesse0
- Direction
- negativelye0
- Qualifier
- but not in the N experimente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Head rice yield and chalkiness were negatively associated in the water experiment but not in the N experiment”
Claim · model-written summary
Grain chalkiness was more stable across environments than head rice yield.
- Taxon
- riceOryza sativae0
- Outcome
- Grain chalkinesse0
- Direction
- more stablee0
- Comparator
- head rice yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain chalkiness of the varieties was more stable against variation in the environment than head rice yield”
The same questions in other papers
nitrogen · quality: grain · Oryza sativa (rice)Results differ
80 papers in the same direction as this paper · 19 in the opposite direction · 2 reporting no difference from an alternative
- negative
- no effect
- negative
98 papers more in this group
See all 102 papers →nitrogen · yield · Oryza sativa (rice)Positive and negative results
1,802 papers in the same direction as this paper · 193 in the opposite direction · 49 reporting no difference from an alternative
- no effect
- positive
- negative
2,041 papers more in this group
See all 2,045 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.