Agriculture Reference
In-Depth Information
TABLE 1.12
Spikelet Sterility of Eight Lowland Rice Genotypes as
Influenced by Nitrogen Fertilization
Genotype
0 mg N kg
−
1
304 mg N kg
−
1
Javae
3.95c
4.93b
Rio Formoso
30.30ab
22.20a
CAN 6343
16.90bc
24.53a
CCNA 7550
25.22ab
22.87a
CAN 7556
31.90a
21.27a
CAN 7857
30.03ab
23.83a
CAN 8319
30.37ab
19.43ab
CAN 8619
10.00c
13.60ab
Average
22.33
19.08
F-test
N level (N)
*
Genotype (G)
**
N × G
*
Source:
Adapted from Fageria, N. K. and M. P. Barbosa Filho. 2001.
Commun. Soil Sci. Plant Anal
. 32:2079-2090. With permission.
Note:
Means followed by the same letter in the same column are not sig-
nificantly different at the 5% probability level by Tukey's test.
*,**Significant at the 5% and 1% probability levels, respectively.
1.2.1.6 Grain Yield
Grain yield in cereals and legumes significantly increased with the addition of N fertilization
(Watson et al., 1958; Halse et al., 1969; Spratt and Gasser, 1970; Langer and Liew, 1973; Novoa and
Loomis, 1981; Fageria and Santos, 2008; Fageria et al., 2011a,b). Roth et al. (2013) reported a signifi-
cant increase in the grain yield of corn with the addition of N. Benzian and Lane (1979) analyzed the
relationship between the N supply, the grain protein content, and the yield in numerous experiments
at Rothamsted and elsewhere. They found that greater N supply increased the grain protein content
more or less linearly, while yield showed a diminishing return pattern. When N is strongly limiting,
R
2
= 0.3505**
Y = 21.6399 - 0.1984X
20
15
10
5
20
40
60
80
Spikelet sterility (%)
FIGURE 1.12
Relationship between spikelet sterility and grain yield of lowland rice. (Adapted from Fageria,
N. K., A. B. Santos, and A. M. Coelho. 2011b.
J. Plant Nutr
. 34:371-386. With permission.)
