Abstract
In the field plot experiments,the relationships of SPAD readings to chlorophyll content,to nitrogen content in maize leaves of different developmental stages and to the yield were studied.The best leaf location and stage of SPAD readings were determined,which could be used to predict the maize production.The results showed that the sensitive periods of the SPAD readings of lobus leaves to nitrogen were stages of 12 leaves,10 leaves and 8 leaves,re-spectively.While for the ear leaves,the sensitive periods were stages of tasseling,filling and dough.In addition,the SPAD readings were also suggested to well reflect the chlorophyll content,the total nitrogen content and the maize yield.It was the best stage of 10 leaves in which the leaf SPAD readings could evaluate the nutritional status and rec-ommend the top dressing time.Meanwhile the stage of 12 leaves was the best stage to early predict the maize yield by using the SPAD readings.The methods of measuring the SPAD readings are convenient and not destroying leaf growth,which should be one of the indices to predict maize yield.
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Claims 8
Claim · model-written summary
Lobus leaf SPAD readings were sensitive to nitrogen at the 12, 10 and 8 leaf stages.
- Organ / stage
- lobus leavese0
- Outcome
- sensitive periods of the SPAD readings of lobus leaves to nitrogene0
- Value
- 12 leaves,10 leaves and 8 leavese0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sensitive periods of the SPAD readings of lobus leaves to nitrogen were stages of 12 leaves,10 leaves and 8 leaves,re-spectively.”
t0“Maize”
Claim · model-written summary
Ear leaf SPAD readings were sensitive at tasseling, filling and dough stages.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for the ear leaves,the sensitive periods were stages of tasseling,filling and dough.”
t0“Maize”
Claim · model-written summary
SPAD readings reflected chlorophyll content and total nitrogen content.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the SPAD readings were also suggested to well reflect the chlorophyll content,the total nitrogen content and the maize yield.”
Claim · model-written summary
SPAD readings reflected maize yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the SPAD readings were also suggested to well reflect the chlorophyll content,the total nitrogen content and the maize yield.”
Claim · model-written summary
The ten-leaf stage was best for SPAD evaluation of nutritional status and top dressing time.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It was the best stage of 10 leaves in which the leaf SPAD readings could evaluate the nutritional status and rec-ommend the top dressing time.”
t0“Maize”
Claim · model-written summary
The twelve-leaf stage was best for early yield prediction using SPAD readings.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stage of 12 leaves was the best stage to early predict the maize yield by using the SPAD readings.”
Claim · model-written summary
SPAD measurement was convenient and did not damage leaf growth.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The methods of measuring the SPAD readings are convenient and not destroying leaf growth”
t0“Maize”
Claim · model-written summary
The authors recommend SPAD readings as an index of maize yield.
- Outcome
- indices to predict maize yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which should be one of the indices to predict maize yield.”
t0“Maize”