Abstract:
An investigation was conducted on hot water seed treatment of rice, wheat and
maize seeds in controlling seed infection for proper germination during the period
from July 2021 to December 2022, at the central laboratory of the Department of
Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207.Suitable
temperature and time for seed treatment were determined. Irrespective to the
cereal seeds, the temperature and time of treatment had shown significant effect
on reduction of seed infection and increase of seed germination. The hot water
treatment also had remarkable effect on rotten seeds, dead seeds and abnormal
seedlings. The experimental treatments were T
1
= Hot water at 52℃ for 5 and 10
min, T
2
= Hot water at 54℃ for 5 and 10 min, T
3
= Hot water at 56°C for 5 and 10
min, T
4
= Hot water at 58℃ for 5 and 10 min, T
5
= Hot water at 60℃ for 5 and 10
min and T
6
= Control (Using normal water at ambient temperature (25±1°C)). Data
were collected on % seed germination, % seed infection, % rotten seed and %
dead seed. The experiments were conducted following Completely Randomized
Design (CRD) with 4 replications. In case of rice seed, the highest seed
germination (91%) and the lowest seed infection (0%) were noted at 56°C for 5
min while (94%) seed germination and (0%) seed infection were recorded at 54°C
for 10 min. In case of wheat seed, the highest seed germination (88%) and the
lowest seed infection (0%) were recorded at 54°C for 5 min while it was (90%)
seed germination and (0%) seed infection at 52°C for 10 min. In case of maize
seed, the highest seed germination and the lowest seed infection respectively were
(82%) and (0%) at 58°C for 5 min while it was (84%) seed germination and (0%)
seed infection at 56°C temperature for 10 min. In case of rice, Fusarium spp and
in case of wheat & maize, Bipolaris spp was found. Irrespective to the cereal
seeds, the seed infection was found to be reduced with the increase of temperature
and time. The percent dead seed also increased with the increase of temperature.
Thus, the rice seed should be treated with hot water at 56°C for 5 min or 54°C
temperature for 10 min. In case of wheat seed, farmers are suggested to treat with
hot water at 54°C for 5 min or 52°C temperature for 10 min while for maize seed,
farmers are recommended to go through hot water at 60°C temperature for 5 min
or 56°C temperature for 10 min for getting the highest seed germination
minimising the seed infection.
Description:
A Thesis
Submitted to the Institute of Seed Technology,
Sher-e-Bangla Agricultural University, Dhaka,
In Partial fulfillment of the requirements
for the degree of
MASTER OF SCIENCE
IN
SEED TECHNOLOGY