Agriculture Reference
In-Depth Information
6000
BRA 01381
BRA 031032
BRA 031030
5000
BRA 02654
BRA 01330
4000
3000
R
2
= 0.39**
BRA 01381 (Y) = 2981.28 + 12.55X
2000
R
2
= 0.31**
BRA 031030 (Y) = 3185.08 + 9.76X
BRA 031032 (Y) = 3076.48 + 20.54X - 0.0532X
2
R
2
= 0.36**
1000
BRA 02654 (Y) = 3225.29 + 17.13X - 0.0401X
2
R
2
= 0.43**
R
2
= 0.46**
BRA 01330 (Y) = 2683.27 + 10.14X
0
50
100
150
200
Nitrogen rate (kg ha
-1
)
FIGURE 8.24
Response of lowland rice genotypes to nitrogen fertilization.
Data in Figures 8.26 and 8.27 show a grain yield and a straw yield of 10 upland rice genotypes at
two soil pH. Genotypes were having significant differences in grain yield as well as in straw yield at
two pH levels. Based on the grain yield efficiency index, genotypes were classified as tolerant, mod-
erately tolerant, and susceptible to soil acidity (Figure 8.28). Figures 8.29 through 8.31 show the root
growth of upland rice genotypes at two lime levels. It is very clear from these figures that upland
rice genotypes were having different root growth at two lime levels, which might be responsible for
the different uptake of nutrients and water and different responses to soil acidity.
Oilseed rape (
Brassica napus
L.) is an important oil crop that needs a large amount of nutrients
(Zhang et al., 2010). Owing to the low efficiency of use of N fertilizers (Schjoerring et al., 1995), a
large amount of the N fertilizer is applied to obtain maximum economic yield (Zhang et al., 2010). It
6000
5000
4000
3000
2000
BRA 032033 (Y) = 3062.36 + 33.71X - 0.12X
2
BRA 042094 (Y) = 2954.10 + 39.76X - 0.17X
2
BRA 01506 (Y) = 2742.31 + 36.55X - 0.17X
2
BRA 032051 (Y) = 1779.37 + 27.12X - 0.13X
2
R
2
= 0.44*
R
2
= 0.50*
R
2
= 0.41*
R
2
= 0.39*
1000
0
50
100
150
200
Nitrogen rate (kg ha
-1
)
FIGURE 8.25
Response of upland rice genotypes to nitrogen fertilization.
