Abstract
Field experiments on two Japonica rice varieties(Zhendao 88 and Nanjing 44) were conducted to study the impacts of nitrogen(N) application amounts(0 kg/hm2,150 kg/hm2,300 kg/hm2) on grain quality and mineral concentrations.Similar impacts of N application levels were found on the varieties.Grain quality indicators of brown rice rate,milled rate,head rice rate,chalkiness size,chalky grain rate,chalkiness decreased and length-width ratio increased along with the increase of N application amount.The head rice rate,chalky grain rate declined significantly and length-width ratio increased significantly in high-nitrogen-level treatment.The effect of nitrogen fertilization was bigger on appearance quality than on processing quality.Grain amylose content dropped,while protein content rose in the grain as N application amount went up,and protein content increased significantly in high nitrogen level.The contents of most mineral elements(Mg,Ca,P,Fe,Zn,Cu) except Mn in milled rice decreased with N application rates,and the contents of other elements varied among rice cultivars.The results demonstrate that N application may sacrifice the processing quality and mineral nutrition,but improve the appearance quality of Japonica rice in Jianghuai River area.Determining the optimal N application rate for a rice crop requires comprehensive consideration of all the aspects of production,including the integration of high yield and high nitrogen use efficiency,and simutaneous improvement of yield and mineral mutrition.
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Claims 12
Claim · model-written summary
Nitrogen levels had similar effects on both rice varieties.
- Taxon
- Japonica rice
_by_Augustus_Binu.jpg?width=60)
Oryza sativa Japonica Groupt0 - Treatment
- N application levelse0
- Outcome
- Similar impactse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_by_Augustus_Binu.jpg?width=500)
Verbatim
e0“Similar impacts of N application levels were found on the varieties”
t0“Japonica rice”
Claim · model-written summary
Increasing nitrogen reduced brown rice rate, milled rate and head rice rate.
- Taxon
- rice
Oryza sativat0 - Treatment
- increase of N application amounte0
- Outcome
- brown rice rate,milled rate,head rice ratee0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“brown rice rate,milled rate,head rice rate,chalkiness size,chalky grain rate,chalkiness decreased and length-width ratio increased along with the increase of N application amount”
t0“rice”
Claim · model-written summary
Increasing nitrogen reduced chalkiness size, chalky grain rate and chalkiness.
- Taxon
- riceOryza sativat0
- Treatment
- increase of N application amounte0
- Outcome
- chalkiness size,chalky grain rate,chalkinesse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chalkiness size,chalky grain rate,chalkiness decreased and length-width ratio increased along with the increase of N application amount”
t0“rice”
Claim · model-written summary
Increasing nitrogen increased grain length-width ratio.
- Taxon
- riceOryza sativat0
- Treatment
- increase of N application amounte0
- Outcome
- length-width ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“length-width ratio increased along with the increase of N application amount”
t0“rice”
Claim · model-written summary
High nitrogen significantly reduced head rice rate and chalky grain rate.
- Taxon
- riceOryza sativat0
- Treatment
- high-nitrogen-level treatmente0
- Outcome
- head rice rate,chalky grain ratee0
- Direction
- declinede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The head rice rate,chalky grain rate declined significantly and length-width ratio increased significantly in high-nitrogen-level treatment”
t0“rice”
Claim · model-written summary
High nitrogen significantly increased length-width ratio.
- Taxon
- riceOryza sativat0
- Treatment
- high-nitrogen-level treatmente0
- Outcome
- length-width ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“length-width ratio increased significantly in high-nitrogen-level treatment”
t0“rice”
Claim · model-written summary
Nitrogen fertilization affected appearance quality more than processing quality.
- Taxon
- riceOryza sativat0
- Outcome
- effect of nitrogen fertilizatione0
- Direction
- biggere0
- Comparator
- processing qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of nitrogen fertilization was bigger on appearance quality than on processing quality”
t0“rice”
Claim · model-written summary
Grain amylose decreased as nitrogen application rose.
- Taxon
- riceOryza sativat0
- Treatment
- N application amount went upe0
- Outcome
- Grain amylose contente0
- Direction
- droppede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain amylose content dropped,while protein content rose in the grain as N application amount went up”
t0“rice”
Claim · model-written summary
Grain protein increased as nitrogen application rose, significantly at high nitrogen.
- Taxon
- riceOryza sativat0
- Treatment
- N application amount went upe0
- Outcome
- protein contente0
- Direction
- rosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“protein content rose in the grain as N application amount went up,and protein content increased significantly in high nitrogen level”
t0“rice”
Claim · model-written summary
Milled-rice Mg, Ca and P decreased with nitrogen rate.
- Taxon
- riceOryza sativat0
- Treatment
- N application ratese0
- Outcome
- mineral elements(Mg,Ca,P,Fe,Zn,Cu)e0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The contents of most mineral elements(Mg,Ca,P,Fe,Zn,Cu) except Mn in milled rice decreased with N application rates”
t0“rice”
Claim · model-written summary
Other mineral element contents varied among rice cultivars.
- Taxon
- riceOryza sativae0
- Outcome
- contents of other elementse0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of other elements varied among rice cultivars”
Claim · model-written summary
Authors recommend integrating yield, nitrogen efficiency and mineral nutrition when selecting nitrogen rate.
- Taxon
- riceOryza sativae0
- Outcome
- optimal N application ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Determining the optimal N application rate for a rice crop requires comprehensive consideration of all the aspects of production,including the integration of high yield and high nitrogen use efficiency,and simutaneous improvement of yield and mineral mutrition”
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