Agriculture Reference
In-Depth Information
Figure 9.4
Effects of temperatures on apple fruit set and yield.
(
a
) Percentage fruit set (
S
) of hand-pollinated 'Cox' flowers at East
Malling,UK and that estimated from the equation
S
=
114.0
−
9.0
T
maxFMA
−
2.0PT where
T
maxFMA
=
mean of daily temperature
maxima in February,March and April; PT
=
calculated days to
•
—
•
,Actual percentage fruit set;
---
,estimated percentage fruit set. (
b
) UK average annual yields
(t ha
−
1
complete pollen-tube growth.
)
,of cv. 'Cox' and those estimated from the equation:
Y
=
4.91
+
0.254
T
−
1.127
T
maxFMA
−
0.622PT
+
0.732
T
maxJ
where
T
=
years from 1948;
T
maxFMA
=
mean of daily temperature maxima
in February,March and April; PT
=
calculated days to complete
pollen-tube growth;
T
maxJ
=
mean of daily temperature maxima in
•
•
June.
,actual yield;
---
,estimated yield. Adapted
from Jackson
et al.
(1983). Reproduced with permission.
—
