| dc.description.abstract | Two experiments were carried out at the Agroforestry and Environment laboratory of Hajee
Mohammad Danesh Science and Technology University (HSTU), Dinajpur during 1st March 2016
to 31st July 2016 to find out the response of three rice varieties againist Eucalyptus camaldulensis
allelopathic effect. For germination 1st, three rice varieties (Hybrid, BRRI Dhan 29 and BRRI
Dhan 28) were sterilized in sodium hypochlorite solution for 5 minutes and finally rinsed with
distilled water which were used as control at room temperature. Then seeds were placed in
petridish which were tested in four allelopathic levels (0, 10, 15 and 20% concentration of
eucalyptus leaf extract). The germination of all rice varieties were delayed and percentage of
germination were reduced with increasing the level of eucalyptus leaf extract concentration
compared to control. Shoot and root growth, and root number. Results on germination and
seedling growth indicate that hybrid was more tolerant and BRRI Dhan 28 was more sensitive
varieties to alletopathy effect of eucalyptus leaf. For determining yield contributing characters and
yield of three rice varieties (Hybrid, BRRI Dhan 29, BRRI Dhan 28), another experiments were
carried out at Agroforestry field of HSTU, Dinajpur during 1st March, 2016 to 31st July, 2016.
Here 36 pots were used for planting seedling where the surface area of each pot was 0.14m2
. After
3 days of showing seedling in pots, seedlings overcome transplanting shock. Then the treatment
were started after 7 days interval by using 0, 10, 15 and 20% concentration of eucalyptus leaf
extract. Most of the growth and physiological characters viz, plant height, shoot length, root
length, number of leaves, number of tiller, plant height at harvest time, number of tiller/ hill,
number of effective tiller/ hill, number of sterile tiller/ hill, penicle length, weight of grain/panicle,
number of spikelet/ panicle, number of unfilled grain/ panicle, number of filled grain/ panicle
were performed better at control condition and showed the lowest performance in respect of all
the treatments (10, 15 and 20% eucalyptus leaf extract) condition. More concentration of
eucalyptus leaf extracts gave more inhabition on both yield contributing characters and yield of
rice. The highest number of fill grain per panicle (139.6) was found in control whereas the lowest
(111.8) was found at 20% leaf extract concentration. Again, among the three varieties of rice
hybrid gave the highest fill grain per panicle (126.3) whereas BRRI Dhan 28 gave the lowest
(120.7). Therefore, hybrid rice performed better in association with eucalyptus leaf extract than
the other varieties (BRRI Dhan 29 and BRRI Dhan 28). So for eucalyptus plus rice based
cropland agroforestry system, the amount of eucalyptus leaf present in the field and the variety of
rice should be considered. | en_US |
