Abstract
Leaf area index(LAI)of fruit trees provides significant references for precision spraying.However,measuring LAI from the vertical direction conventionally does not conform to the actual demand of lateral precision spraying.In this paper,using measuring system of citrus LAI with near-infrared transmittance technique,LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated,and then the real leaf area was obtained by direct method as standard values to measure the error.The experimental result was that the average absolute value of the absolute errors were 0.45 and 0.40 respectively,and average absolute value of the relative errors were 17.37% and14.91%respectively when measuring in east-west direction and south-north direction.Besides the error of measuring the total leaf area was not much different with the error of measuring from vertical direction by using the system or WinSCANOPY Canopy analysis system.It shows that the accuracy of measuring LAI or total leaf area from horizontal direction meets the requirement of the experiment.
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Claims 4
Claim · model-written summary
The average absolute error of horizontally measured LAI was 0.45 and 0.40 in the east-west and south-north directions.
- Outcome
- average absolute value of the absolute errorse3
- Value
- 0.45 and 0.40 respectivelye3
- Qualifier
- east-west direction and south-north directione3
- Comparator
- direct methode2
CitrusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated”
e2“the real leaf area was obtained by direct method as standard values to measure the error”
e3“The experimental result was that the average absolute value of the absolute errors were 0.45 and 0.40 respectively, and average absolute value of the relative errors were 17.37% and14.91%respectively when measuring in east-west direction and south-north direction”
Claim · model-written summary
The average relative error of horizontally measured LAI was 17.37% and 14.91% in the east-west and south-north directions.
- Outcome
- average absolute value of the relative errorse3
- Value
- 17.37% and14.91%respectivelye3
- Qualifier
- east-west direction and south-north directione3
- Comparator
- direct methode2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated”
e2“the real leaf area was obtained by direct method as standard values to measure the error”
e3“The experimental result was that the average absolute value of the absolute errors were 0.45 and 0.40 respectively, and average absolute value of the relative errors were 17.37% and14.91%respectively when measuring in east-west direction and south-north direction”
Claim · model-written summary
Error of measuring total leaf area from the horizontal direction was not much different from error of vertical-direction measurement.
- Outcome
- error of measuring the total leaf areae4
- Comparator
- error of measuring from vertical directione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated”
e4“Besides the error of measuring the total leaf area was not much different with the error of measuring from vertical direction by using the system or WinSCANOPY Canopy analysis system”
Claim · model-written summary
Horizontal-direction measurement of LAI or total leaf area meets the accuracy requirement of the experiment.
- Outcome
- accuracy of measuring LAI or total leaf area from horizontal directione5
- Comparator
- requirement of the experimente5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated”
e5“It shows that the accuracy of measuring LAI or total leaf area from horizontal direction meets the requirement of the experiment”