Agriculture Reference
In-Depth Information
TABLE 1.11
Pod Number per Pot of 20 Dry Bean Genotypes as
Influenced by N Fertilization
Genotype
0 mg N kg
−
1
400 mg N kg
−
1
Pérola
9.0a
16.3a
BRS Valente
5.3a
14.7a
CNFM 6911
13.7a
26.0a
CNFR 7552
5.3a
27.7a
BRS Radiante
6.3a
20.3a
Jalo Precoce
7.3a
20.7a
Diamante Negro
6.7a
25.7a
CNFP 7624
5.7a
30.3a
CNFR 7847
13.0a
34.7a
CNFR 7866
4.3a
15.3a
CNFR 7865
9.7a
25.7a
CNFM 7875
4.7a
29.3a
CNFM 7886
5.7a
31.7a
CNFC 7813
5.3a
29.0a
CNFC 7827
6.0a
34.3a
CNFC 7806
6.3a
24.0a
CNFP 7677
8.0a
31.7a
CNFP 7775
6.7a
34.3a
CNFP 7777
10.0a
28.0a
CNFP 7792
5.3a
15.7a
Average
7.2b
25.8a
F-test
N rate (N)
**
Genotype (G)
**
**
N × G
Source:
Adapted from Fageria, N. K., L. C. Melo, and J. P. Oliveira.
2013.
J. Plant Nutr
. 36:2179-2190. With permission.
Note:
Means followed by the same letter in the same column are not
significantly different at the 5% probability level by Tukey's
test. Average mean values were compared in the same line.
**Significant at the 5% probability level.
filling growth stage is one way to improve the spikelet filling rate. Of the 15% unfilled spikelets,
however, about 5-10% are unfertilized and difficult to eliminate (Yoshida, 1981). When the filled
spikelet number is more than 85%, the yield capacity or sink is limiting yield, and when the rip-
ened spikelet number is less than 80%, assimilate supply or source is yield limiting (Murata and
Matsushima, 1975).
Tanaka and Matsushima (1963) reported that the amount of carbohydrates stored in the shoot
at the flowering stage improved spikelet filling by acting as a buffer substance in a case where a
plant faced unfavorable conditions. Hayashi (1995) also reported improved spikelet filling by the
large amount of carbohydrate accumulated during flowering, and cultivar differences exist in the
amount of the carbohydrate accumulation at the flowering growth stage. Furthermore, Hayashi
(1995) reported that an accumulation of a large amount of carbohydrates in the shoot before flower-
ing also reduces spikelet degeneration.
