Agriculture

Effects of Temperature on The Egg Production and Growth of Monosex Nile Tilapia Oreochromis Niloticus Fry

n order to know the effect of temperature on egg production and growth of monosex Nile tilapia (Oreochromis niloticus) fry the present study was conducted at a private fish hatchery in Trishal upazilla of Mymensingh district for nine months from January to September 2011. Pond water temperature during the experimental period fluctuated from 25°C to 33°C. Eggs were collected from mouth of female tilapia and were subsequently incubated for hatching in tray where incubation temperature was maintained at 28 C. Monosex male tilapia was produced by feeding 17a–methyl testosterone hormone mixed feed. Growth of fry was observed at 7, 14 and 21 days at different water temperature. Results of the present study showed that water temperature had significant (P<0.01) effect on egg production. Egg production decreased with the increase of water temperature. Maximum number of eggs was produced at 25°C and minimum number at 33°C. The most suitable period for egg production was observed in March and the optimum temperature was between 25 and 28°C. Egg production was found very low at temperature ranged from 2933°C. Water temperature also found to have a significant (P<0.01) effect on growth of fry. The growth of fry decreased with the increase of water temperature. The optimum temperature for growth was 25-29°C and the growth was found lower at 30-33°C. These results of the present study thus indicated that temperature played an important role on promoting the egg production and growth of Nile tilapia fry.

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Effects of Temperature on the Egg Production and Growth of Monosex Nile Tilapia Oreochromis Niloticus Fry

In order to know the effect of temperature on egg production and growth of monosex Nile tilapia (Oreochromis niloticus) fry the present study was conducted at a private fish hatchery in Trishal upazilla of Mymensingh district for nine months from January to September 2011. Pond water temperature during the experimental period fluctuated from 25°C to 33°C. Eggs were collected from mouth of female tilapia and were subsequently incubated for hatching in tray where incubation temperature was maintained at 28±1oC. Monosex male tilapia was produced by feeding 17α–methyl testosterone hormone mixed feed. Growth of fry was observed at 7, 14 and 21 days at different water temperature. Results of the present study showed that water temperature had significant (P

PHOSPHORUS LEVELS ON GROWTH AND FLOWERING OF TUBEROSE

The experiment was conducted at the Horticultural farm of Sher-e-Bangla Agricultural University, Dhaka, during the period from April, 2009 to March, 2010 to investigate the effect phosphorus on growth, flowering and bulb yield of tuberose. The experiment consisted of Four levels of phosphorus i.e. P0: 0, P1: 135, P2: 145 and P3: 155 kg P2O5/ha respectively and was laid out with Randomized Complete Block Design with three replications. Highest flower (19.3 t/ha) and bulb (24.7 t/ha) yield was recorded from P3 and the lowest flower (9.6 t/ha) and bulb (14.5 t/ha) yield was recorded from P0.

PERFORMANCES OF DIFFERENT AGED SAPLINGS ON THE DEVELOPMENT OF TWO ALBIZIA SPECIES UNDER DIFFERENT AGROFORESTRY CONDITIONS

The experiment was conducted in the agroforestry Farm, Department of Agroforestry, Bangladesh Agriculture University, Mymensingh during April to October, 2003 to recorded the incidence of different aged saplings to two Albizia species under different Agroforestry conditions. Development was studied in terms of survivability and normal physical conditions of the seedlings/saplings followed by the Development of shoot in terms of plant height and number of branches. Establishment of the species was observed to be similar in all the treatments except that in medium-low land boundary (ail) upraised (flat) bed condition having poor performances due to partial water logged condition. The physical condition of the sapling also appeared to be similar except that in medium low land treatment which showed the highest abnormalities. The highest number of primary branches and the maximum height were attained by 18 month age group of sapling at 180 DAP and the lowest were attained by zero month age group of sapling at 180 DAP respectively. Among the different age groups the older seedlings/saplings of both the species could successfully be developed in all the field conditions with poor performances in medium low land treatment. Albizia lebbeck showed better performance than Albizia at sapling stage when properly managed following plantation in different field conditions.

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EFFECT OF WHEAT BRAN SUPPLEMENTS WITH RICE STRAW ON THE PROXIMATE COMPOSITION OF OYSTER MUSHROOM

The study were carried out to investigate the effect of different levels of wheat bran (0, 10, 20, 30 and 40%) as supplement with rice straw on the proximate composition of Pleurotus ostreatus. The highest moisture content (91.08%) was observed under 20% wheat bran with rice straw treatment where as the highest dry matter percentage (9.85) was observed in 40% wheat bran with rice straw treatment. The highest amount of protein (27.78%) but the lowest amount of lipid (3.24%) and carbohydrate (39.44%) were observed in 30% wheat bran with rice straw treatment. The highest crude fiber (23.38 %) and ash (8.12%) were observed in 10% wheat bran with rice straw treatment. The highest amount of lipid (5.08%) and carbohydrate (48.45%) were observed in 0% wheat bran with rice straw treatment. The highest percentage of phosphorus (0.986), potassium (1.37) and calcium (26.58 mg/100g) were found in 30% wheat bran with rice straw treatment. The highest amount of iron (44.54 mg/100g) and zinc (15.17 mg/100g) were found in 20% wheat bran with rice straw treatment.

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