Agriculture Reference
In-Depth Information
TABLE 6.8
Influence of Nitrogen, Phosphorus, and Potassium Levels on Panicle Number, 1000 Grain
Weight, and Root Dry Weight
N, P, and K Treatments
Panicle Number (Plant
−1
)
1000 Grain Weight (g)
Root Dry Weight (g Plant
−1
)
1. N
0
P
0
0.00e
0.00e
0.18d
2. N
0
P
1
2.42d
29.67ab
1.59cd
3. N
0
P
2
2.66d
30.29a
1.53cd
4. N
1
P
0
0.0e
0.00e
0.22d
5. N
1
P
1
3.89c
27.92bc
2.77bc
6. N
1
P
2
5.58b
26.45cd
4.32ab
7. N
2
P
0
0.0e
0.00e
0.28b
8. N
2
P
1
5.66b
26.27cd
4.09ab
9. N
2
P
2
7.27a
25.65d
5.11a
1. N
0
K
0
1.44a
20.13a
1.04c
2. N
0
K
1
1.44a
20.12a
1.03c
3. N
0
K
2
2.19a
19.71ab
1.23c
4. N
1
K
0
2.55a
17.73bcd
2.15bc
5. N
1
K
1
3.11a
18.79abc
2.04bc
6. N
1
K
2
3.81a
17.89bcd
3.12ab
7. N
2
K
0
3.25a
16.11d
1.68bc
8. N
2
K
1
4.53a
17.41cd
3.21ab
9. N
2
K
2
5.17a
18.39abc
4.58a
1. P
0
K
0
0.00d
0.00a
0.14c
2. P
0
K
1
0.00d
0.00a
0.26c
3. P
0
K
2
0.00d
0.00a
0.29c
4. P
1
K
0
2.58c
27.66a
2.31b
5. P
1
K
1
4.42b
28.11a
2.43b
6. P
1
K
2
4.97b
28.10a
3.73ab
7. P
2
K
0
4.67b
26.31a
2.44b
8. P
2
K
1
4.66b
28.22a
3.61ab
9. P
2
K
2
6.19a
27.86a
4.91a
F-test
N
**
**
**
P
**
**
**
K
**
**
**
N × P
**
**
**
N × K
NS
**
**
P × K
**
NS
**
N × P × K
**
NS
NS
CV (%)
22.40
7.20
47.36
Note:
Means within the same column and interaction N × P, N × K, and P × K nutrient levels followed by the same letter
do not differ significantly at the 5% probability level by Tukey's test.
**, NS: Significant at the 1% probability level and not significant, respectively.
received adequate amounts of N and P (Figure 6.7). The root system was also adversely affected in
the absence of N, P, and K fertilization. Figure 6.8 shows that root growth increased with increas-
ing K fertilization. Fageria (1984, 1989) and Fageria and Baligar (1997) presented similar results
in relation to N, P, and K deficiency symptoms, as well as root and shoot growth of rice grown on
Brazilian Oxisol.
