Agriculture Reference
In-Depth Information
(a)
9
SE
0
H
H
x
xx
(b)
15
SE
0
H
H
x
x
x
x
(c)
15
SE
0
x
x
x
x
x
x
Figure 11.2
Root distribution between the orchard surface and
30 cm depth (*,roots
2 mm diameter) and
uptake into the leaves of
15
N from the row and inter-row positions:
(
a
) grass,(
b
) herbicide strip,(
c
) overall herbicide. Shaded
<
2 mm diameter; x,roots
>
=
at
10 cm depth,open
at 25 cm depth. From Atkinson and White
(1980). Reproduced with permission.
=
unexpectedinviewoftheincreasedsoilP,maybelinkedtoreducedpopulations
of mycorrhizal fungi in overall-herbicide treated soil, which may be a result
of elimination of grass roots there (Atkinson,
). The increase in soil N,
P and K as a result of overall-herbicide management may lead to problems
of excess, including Mg and Zn deficiency as a result of excess soil P and K
(Hennerty,
). The problem of excess K uptake from herbicide strips can
be reduced by cultivation to a depth of
centimetres (Delver,
b). This
