The experiment was carried out at Bangladesh Rice Research Institute (BRRI), Regional Station, Comilla, Bangladesh to determine the seeding interval of most promising parental lines of hybrid rice during boro 2009-10 season. The seeding interval between A (Cytoplasmic genetic male sterile line) and R (Restorer line) lines were determined by growth duration difference (GDD), leaf number difference (LND) and effective accumulated temperature (EAT) method. Five A lines and 12 R lines were used in this experiment. In 5 A lines, the days to 50% flowering ranged from 120 to 135 days and in 12 R lines, it ranged from 127 to 139 days. The leaf number varied from 15.07 to 18.63 and from 17.05 to 19.89 in the A and R lines, respectively. Among the A line, the EAT ranged from 1069 to 12910C and 1174 to 13510C in R lines. The growth duration differences between A and R lines varied found from 1 to 19 days. Similarly, the leaf number differences between A and R lines were from 0 to 4.82. The seeding differences between A and R lines in terms of EAT were from 13.50 to 282.20C.

An observation trial was conducted at the research field of Bangladesh Agricultural Research Institute, Joydebpur, Gazipur during November 2012 to March 2013. This experiment was under taken to find out the efficiency of weed control in wheat field by the application of sorghum plant parts water extract. The treatments were: i) T1= 2 kg dry sorghum plant parts/10 lit water extract/ha ii) T2= 1 kg dry sorghum plant parts/10 lit water extract/ha and iii) T3= only water spray. Treatment, T1 showed the minimum number of weeds (28) compared to treatment T2 (43). But minimum dry wt of weeds were found in treatment T2.Weed control efficiency, (WCE) was also highest in treatment, T2 (17.08) compared to treatment T1 (13.76). The grain yield was highest in treatment, T2; though the length of spike and no. of grains/spike was highest in treatment, T3 (Only water spray).

The use of phosphate solubilizing microorganism to dissolve phosphate content of phosphate ore instead of conventionally methods is an ecologically safe and economically reasonable. The objective of the present study is to study the factors affecting on dissolution of phosphate content in Abu Tartur phosphate ore by using fungus.The serial dilution method was performed to inoculums solutions to achieve microorganisms isolation which obtaining one fungus that has ability to dissolve phosphate ore and is identified by 18 sRNA as Aspergillus niger. The optimum conditions of bioleaching of Abu Tartur phosphate ore were 7 days incubation period at glucose-yeast extract medium, 2x106 SFU of A.niger for 50 ml medium, 0.5% Abu Tartur phosphate ore incubated at 30 °C. different carbon and nitrogen sources were evaluated which peptone was the best nitrogen source, glucose the best carbon source, the best diameter of conical flask base for bioleaching process was above 4.5 cm , no significant effect of addition factor, also there was decreasing in pH and increased in redox potential, initial pH 6, shaking flask is at 150 rpm. The efficiency of A. niger for phosphate content dissolution of Abu Tartur phosphate ore by applying all optimum conditions was 100%.