Abstract
Two cultivars of Wuxiangjing 9 ( japonica ) and H97-322 ( indica ) were used to study the effects of different level of nitrogen applied as basic and tillering dressing (BT) on the absorption and utilization of nitrogen in rice in the condition of same soil fertility and same nitrogen application at panicle initiation stage. The relative rates of absorbing nitrogen (RRA) in all treatments decreased with the development of rice during the whole lifetime,the greater the ratio of BT to total nitrogen applied,the faster their declining speed became. When the amount of BT was improved,the more nitrogen was absorbed before elongation,and the absorbing nitrogen was inhibited after shooting,especially the uptake of nitrogen was increased from the critical stage of productive tillering to the elongation stage and decreased from the heading stage to the mature stage both significantly. With the increase of BT,BT use efficiency before shooting period was improved,but BT use efficiency and nitrogen use efficiency in the whole growing period of rice were not. It was important for high yield that the amount of BT was at an optimal level,RRA decreased stably and reasonably,the uptake of nitrogen in each development stage met the requirement of population growth and development,nitrogen use efficiency and productivity of grains were coordinative improved. According to the results,the amount of BT applied in the rice production currently was more than necessary.
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Claims 9
Claim · model-written summary
Relative nitrogen absorption rates decreased through rice development.
- Taxon
- rice
Oryza sativae0 - Outcome
- relative rates of absorbing nitrogen (RRA)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative rates of absorbing nitrogen (RRA) in all treatments decreased with the development of rice during the whole lifetime”
Claim · model-written summary
A greater basic and tillering nitrogen ratio accelerated decline in absorption rates.
- Taxon
- RiceOryza sativat0
- Treatment
- ratio of BT to total nitrogen appliede0
- Outcome
- relative rates of absorbing nitrogen (RRA)e1
- Direction
- fastere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the greater the ratio of BT to total nitrogen applied,the faster their declining speed became”
e1“relative rates of absorbing nitrogen (RRA)”
t0“Rice”
Claim · model-written summary
More basic and tillering nitrogen increased uptake before elongation.
- Taxon
- RiceOryza sativat0
- Organ / stage
- before elongatione0
- Treatment
- amount of BTe0
- Outcome
- nitrogen was absorbede0
- Direction
- moree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the amount of BT was improved,the more nitrogen was absorbed before elongation”
t0“Rice”
Claim · model-written summary
More basic and tillering nitrogen inhibited uptake after shooting.
- Taxon
- RiceOryza sativat0
- Organ / stage
- after shootinge0
- Treatment
- amount of BTe1
- Outcome
- absorbing nitrogene0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the absorbing nitrogen was inhibited after shooting”
e1“When the amount of BT was improved”
t0“Rice”
Claim · model-written summary
Nitrogen uptake increased significantly from productive tillering to elongation.
- Taxon
- RiceOryza sativat0
- Organ / stage
- critical stage of productive tillering to the elongation stagee0
- Outcome
- uptake of nitrogene0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the uptake of nitrogen was increased from the critical stage of productive tillering to the elongation stage and decreased from the heading stage to the mature stage both significantly”
t0“Rice”
Claim · model-written summary
Nitrogen uptake decreased significantly from heading to maturity.
- Taxon
- RiceOryza sativat0
- Organ / stage
- heading stage to the mature stagee0
- Outcome
- uptake of nitrogene0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the uptake of nitrogen was increased from the critical stage of productive tillering to the elongation stage and decreased from the heading stage to the mature stage both significantly”
t0“Rice”
Claim · model-written summary
Higher basic and tillering nitrogen improved its use efficiency before shooting.
- Taxon
- RiceOryza sativat0
- Organ / stage
- before shooting periode0
- Treatment
- increase of BTe0
- Outcome
- BT use efficiencye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the increase of BT,BT use efficiency before shooting period was improved”
t0“Rice”
Claim · model-written summary
Higher basic and tillering nitrogen did not improve whole-period nitrogen use efficiency.
- Taxon
- riceOryza sativae0
- Treatment
- increase of BTe1
- Outcome
- nitrogen use efficiencye0
- Direction
- were note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but BT use efficiency and nitrogen use efficiency in the whole growing period of rice were not”
e1“With the increase of BT”
t0“Rice”
Claim · model-written summary
The authors conclude that current basic and tillering nitrogen application in rice production exceeds what is needed.
- Taxon
- riceOryza sativae0
- Outcome
- amount of BT applied in the rice production currently was more than necessarye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of BT applied in the rice production currently was more than necessary”
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See all 149 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.