Agriculture Reference
In-Depth Information
TABLE 6.9
Average Values of Panicle Number, 1000 Grain Weight, and Root Dry Weight across
N, P, and K Levels
N, P, and K
Treatments
Panicle Number
(Plant
−1
)
1000 Grain
Weight (g)
Root Dry Weight
(g Plant
−1
)
Maximum Root
Length (cm)
Spikelet Sterility
(%)
N
0
1.69c
19.99a
1.10a
29.56b
9.17b
N
1
3.16b
18.13b
2.44ab
32.93a
11.75a
N
2
4.31a
17.31b
3.16a
34.63a
9.98ab
Average
3.06
18.48
2.23
32.37
10.30
P
0
0.00c
0.00b
0.23b
24.70c
0.00b
P
1
3.99b
27.96a
2.82a
33.89b
14.25a
P
2
5.18a
27.47a
3.66a
38.52a
16.64a
Average
3.06
18.48
2.23
32.37
10.30
K
0
2.42a
17.99a
1.63a
32.37a
12.27a
K
1
3.03ab
18.78a
2.10a
32.33a
8.92b
K
2
3.72a
18.65a
2.98a
32.41a
9.70b
Average
3.06
18.48
2.23
32.37
10.30
Note:
Means within the same column and same nutrient levels followed by the same letter do not differ significantly at
the 5% probability level by Tukey's test.
6.2.3 n
ItroGen
versus
C
alCIum
Nitrogen and calcium interaction in crop plants is important, especially in legumes where both
these nutrients are required in large amounts. Positive interactions have been reported in most of
the studies related to N and Ca interactions (Fageria and Baligar, 2005). Data in Table 6.10 show
the influence on N on the uptake of Ca in the dry bean shoot. Calcium uptake was significantly and
quadratically increased with increasing N levels from 0 to 200 kg ha
−1
. The increase in Ca uptake
was related to the increase in the dry matter of shoot with the addition of N (Fageria and Baligra,
N
0
P
0
K
0
N
0
P
0
K
1
N
0
P
0
K
2
FIGURE 6.4
Upland rice plants without N, P, and K fertilization (left pot), without N and P and with
100 mg K kg
−1
soil (middle pot), and without N and P and with 200 mg K kg
−1
soil (right pot).
