Agriculture Reference
In-Depth Information
where a good response to K was obtained only when adequate N (90 kg ha
−1
) was applied (PPI,
1988). Also, the response to N increased as the level of K was increased; the highest rice yield as
well as NUE and K use efficiency was obtained when both N and K were applied (PPI, 1988).
The author studied the interaction among N, P, and K in upland rice growth, yield, and yield
components (Table 6.6). There was a significant N × P × K interaction for plant height, shoot dry
TABLE 6.6
Influence of N, P, and K Treatments on Plant Height, Shoot Dry Weight, Grain Yield,
and Grain Harvest Index of Upland Rice
N, P, and K
Treatments
Shoot Dry Weight
(g Plant
−1
)
Grain Yield
(g Plant
−1
)
Plant Height (cm)
Grain Harvest Index
N
0
P
0
K
0
24.33i
0.30i
0.00j
0.00g
N
0
P
0
K
1
26.00i
0.40hi
0.00j
0.00g
N
0
P
0
K
2
46.83f
0.86hi
0.00j
0.00g
N
0
P
1
K
0
75.00e
3.82gh
2.32ij
0.38abcde
N
0
P
1
K
1
75.17de
8.55ef
3.05ij
0.26f
N
0
P
1
K
2
91.92bc
7.30ef
3.75i
0.34bcdef
N
0
P
2
K
0
78.42de
8.56ef
3.20ij
0.27f
N
0
P
2
K
1
79.92de
8.17ef
3.34ij
0.29ef
N
0
P
2
K
2
83.33cde
8.86e
4.05hi
0.31def
N
1
P
0
K
0
39.21fgh
0.52hi
0.00j
0.00g
N
1
P
0
K
1
43.33fg
0.49hi
0.00j
0.00g
N
1
P
0
K
2
35.08ghi
0.54hi
0.00j
0.00g
N
1
P
1
K
0
85.25cde
12.75d
5.93ghi
0.32cdef
N
1
P
1
K
1
106.83a
16.32c
10.71ef
0.39abcde
N
1
P
1
K
2
111.58a
17.69c
12.64de
0.42abc
N
1
P
2
K
0
93.67bc
15.35cd
10.21ef
0.40abcd
N
1
P
2
K
1
111.08a
18.66c
12.35cd
0.43ab
N
1
P
2
K
2
109.08a
22.19b
16.64bc
0.43ab
N
2
P
0
K
0
27.75hi
0.35hi
0.00j
0.00g
N
2
P
0
K
1
30.75hi
0.44hi
0.00j
0.00g
N
2
P
0
K
2
35.83fghi
5.24fg
0.00j
0.00g
N
2
P
1
K
0
86.67cd
15.29cd
7.56fgh
0.33bcdef
N
2
P
1
K
1
110.67a
22.38b
16.20bcd
0.42abc
N
2
P
1
K
2
110.58a
22.89b
18.63b
0.45a
N
2
P
2
K
0
92.75bc
16.73c
8.82fg
0.35abcdef
N
2
P
2
K
1
103.33ab
24.28b
18.75b
0.44ab
N
2
P
2
K
2
108.42a
28.66a
23.01a
0.45a
Average
74.92
10.65
6.78
0.25
F-test
N
**
**
**
**
P
**
**
**
**
K
**
**
**
**
N × P
**
**
**
**
N × K
**
**
**
**
P × K
**
**
**
**
N × P × K
**
**
**
**
CV (%)
4.69
9.98
16.31
9.66
Note:
Means within the same column followed by the same letter do not differ significantly at the 5% probability level
by Tukey's test.
**Significant at the 1% probability level.
