Agriculture Reference
In-Depth Information
12
pH 5.0
a
pH 6.9
10
ab
abc
abc
a
8
ab
ab
ab
bcd
abc
bcd
cd
6
cd
abc
abc
abc
de
bc
4
c
e
2
0
Upland rice genotypes
FIGURE 8.26
Grain yield of upland rice genotypes at two pH levels. Same letters on the bar at the same pH
level do not differ significantly at the 5% probability level.
is estimated that the rate of supply of the N fertilizer to oilseed rape has reached 200-300 kg N ha
−1
(Schjoerring et al., 1995; Wiesler et al., 2001a), and it is still increasing year by year (Zhang et al.,
2010). Not much work has been conducted on the breeding of this crop. However, limited studies
show that a large difference exists in the genotypes of oilseed rape for N efficiency (Wiesler et al.,
2001a,b). It is also reported that cultivars with a high N harvest index has high N use efficiency
pH 5.0
a
pH 6.9
20
15
a
b
10
b
b
b
b
b
b
bc
bc
b
b
bcd
b
bcd
cd
d
d
d
5
0
Upland rice genotypes
FIGURE 8.27
Straw yield of upland rice genotypes at two pH levels. Same letters on the bar at the same pH
level do not differ significantly at the 5% probability level.
