|
°
|
Degree
|
|
∆
|
Smallest still detectable differences in the measurement values
|
|
α
|
Angle of deviation of the pendulum meter given in degrees
|
|
µG
|
Friction coefficient between two surfaces
|
|
a
|
Intercept of the regression equations
|
|
a
|
Acceleration
|
|
ATB
|
Institute of Agricultural Engineering
|
|
B
|
Fixed side of the cantilever in equation 1, here the root
|
|
B
|
Position of undeviated cylindrical body
|
|
B’
|
Position of deviated cylindrical body
|
|
BBCH
|
Uniform code for development stages of arable crops
|
|
bx
|
Linear regression coefficient
|
|
CV
|
Coefficient of variation
|
|
cx2
|
Square regression coefficient
|
|
DAS
|
Days after seeding in rice
|
|
DAT
|
Days after transplanting in rice
|
|
DGPS
|
Differential global positioning system
|
|
di
|
Inner diameter of the stem
|
|
DM
|
Dry mass
|
|
do
|
Outer diameter of the stem
|
|
e
|
Height of the centre of gravity
|
|
E
|
Elasticity of the material, here Young’s modulus
|
|
EI
|
Bending rigidity of the stem
|
|
F
|
Force
|
|
FA
|
Force of the pendulum at 90° deviation
|
|
FF
|
Friction force
|
|
FH
|
Horizontal force component of the pendulum
|
|
FM
|
Fresh mass
|
|
FP
|
Force of the pendulum
|
|
FR
|
Resultant force
|
|
FV
|
Vertical force component of the pendulum
|
|
G
|
Gravity point or centre of gravity of a body
|
|
GPS
|
Global positioning system
|
|
hA0
|
Height of the cylindrical body of the pendulum
|
|
hP
|
Height of the pivot point of the pendulum
|
|
hPl
|
Height of plants
|
|
I
|
Second moment of the area
|
|
IDW
|
Inverse distance weighted (interpolation method)
|
|
IR 64
|
Paddy rice, IRRI-released variety 64
|
|
IR 72
|
Paddy rice, IRRI-released variety 72
|
|
IRRI
|
International Rice Research Institute
|
|
JB
|
Mass moment at the fixed side B of a cantilever
|
|
JG
|
Mass moment in the gravity point G
|
|
K
|
Potassium
|
|
LAI
|
Leaf area index
|
|
lin.
|
Linear
|
|
lP
|
Length of the pendulum
|
|
m
|
Mass of a body
|
|
max.
|
Maximum
|
|
min.
|
Minimum
|
|
m
P
|
Mass of the pendulum at 90 degree deviation
|
|
m
S
|
Mass of the stems including mass moment of inertia
|
|
n
|
Sample size in equation 8
|
|
n
|
Number of measurements to be reduced in equation 9
|
|
N
|
Nitrogen
|
|
NDVI
|
Normalised difference vegetation index
|
|
nS
|
Number of stems
|
|
P
|
Pivot point
|
|
P
|
Phosphorus
|
|
p
|
Page
|
|
PPM
|
Parts per million
|
|
r
|
Height of the contact point between pendulum and stem
|
|
R2
|
Goodness of fit
|
|
RMb
|
Bending moment of resistance
|
|
s
|
Standard deviation in equation 8 from KÖHLER et al. 1992
|
|
SD
|
Standard deviation
|
|
SE
|
Standard error of estimate (in this work standard error of the regression)
|
|
v
|
Average of the vector
|
|
vD
|
Driving velocity
|
|
WGS 84
|
World geodetic system of 1984
|
|
x
|
Bending distance of the stem
|
|
xi
|
Length of the horizontal vector component
|
|
y
|
Dependent variable in the regression equation, here the angle of deviation
|
|
yi
|
Length of the vertical vector component
|