An experiment was carried out at the agronomy field laboratory of Bangladesh Agricultural University, Mymensingh to evaluate the effect of variety and phosphorus on the yield and yield components of groundnut. The experiment comprising of two groundnut varieties viz. BARI Cheenabadam-8 and BINA Cheenabadam-6 and four levels of phosphorus viz. 0, 20, 40 and 60 kg P ha-1. The experiment was laid out in a randomized complete block design with three replications. The highest value of all the parameters e.g. leaf area index (2.02), dry matter (51.88 g plant-1), number of  primary branches plant-1 (10.70), number of  secondary branches plant-1 (13.85), number of pegs plant-1 (64.35), number of total pods plant-1 (44.50), weight of 100-pods (94.66 g), weight of 100-seeds (44.47 g), shelling percentage (81.84%), seed yield (2.48 t ha-1), pod yield (3.03 t ha-1), stover yield (6.92 t ha-1) and harvest index (30.45%) were recorded from  BARI Cheenabadam-8 applied with 60 kg P ha-1. The lowest value of all these parameters was found in BINA Cheenabadam-6 and with no applied phosphorus.  It can be concluded that BARI Cheenabadam-8 should preferably be fertilized with 60 kg P ha-1 to obtain the highest yield.Progressive Agriculture 29 (2): 117-126, 2018

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during July to December 2015 to find out the effect of age of seedlings at staggered planting and nitrogen rate on the growth and yield of transplant Aman rice (cv. BRRI dhan46). The experiment comprised three ages of seedlings viz. 30, 45 and 60-day old and six nitrogen rate viz. 0, 40, 60, 80, 100 and 120k kg N ha -1 . The experiment was laid out in a Randomized Complete Block Design with three replications. The effect of age of seedlings and nitrogen rates and their interaction were significant on yield and yield contributing characters of transplant Aman rice. The highest plant height, total dry matter production hill -1 and leaf area index were recorded in 30-day old seedlings with 80 kg N ha -1 . Grain yield gradually increased with the use of relatively younger seedlings and 30-day old seedlings produced the highest number of effective tillers hill -1 (5.34), grains panicle -1 (110.9), 1000-grain weight (24.60 g), grain yield (4.06 t ha -1 ) and straw yield (5.17 t ha -1 ). In case of nitrogen rate, 80 kg N ha -1 produce the highest grains panicle -1 (113.1), 1000-grain weight (25.39 g), grain yield (4.37 t ha -1 ) and straw yield (5.59 t ha -1 ). In interaction, 30-day old seedlings with 80 kg N ha -1 produced the highest effective tillers hill -1 (6.22), grains panicle -1 (124.1), 1000-grain weight (26.91g), grain yield (4.71 t ha -1 ) and straw yield (6.16 t ha -1 ). Therefore, 30-day old seedlings with 80 kg N ha -1 appeared as the promising technique to obtain the highest grain yield. It was also observed that under adverse situation delaying in transplanting may be continued up to 15 September with aged seedlings (60-day old) from the same source and application of nitrogen ranging from 100-120 kg ha -1 to obtain grain yield ranging from 3.8-4.0 t ha -1 .

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season from July to December, 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46. The experiment consisted of four fertilizer treatments viz. 0 kg N ha −1 (N 0 ), 40 kg N ha −1 (N 1 ), 80 kg N ha −1 (N 2 ) and 120 kg N ha −1 (N 3 ) and four weeding treatments viz. one hand weeding at 20 DAT (W 1 ), two hand weedings at 20 and 35 DAT (W 2 ), three hand weedings at 20, 35 and 50 DAT (W 3 ), weeding by Japanese rice weeder twice at 20 and 35 DAT (W 4 ) and unweeded control (W 5 ). The experiment was laid out in randomized complete block design with three replications. The highest plant height (113.00 cm), number of total tillers hill −1 (8.74), number of effective tillers hill −1 (6.18), panicle length (21.98 cm), number of grains panicle −1 (114.20), grain yield (4.00 t ha −1 ), straw yield (5.25 t ha −1 ) and biological yield (9.25 t ha −1 ) were recorded in N 2 (80 kg N ha −1 ) treatment. The lowest plant height (106.00 cm), number of total tillers hill -1 (7.20), number of effective tillers hill −1 (5.00), panicle length (20.70 cm), number of grains panicle -1 (97.60), grain yield (3.52 t ha −1 ), straw yield (4.46 t ha −1 ) and biological yield (7.97 t ha −1 ) were recorded from N 0 (No nitrogen fertilizer control) treatment. On the other hand, the highest grain yield 4.23 t ha −1 was observed in three weedings condition because of the highest number of effective tillers hill −1 (6.81), number of grains panicle −1 (111.10). The highest straw yield (5.51 t ha −1 ) was also found in three weeding condition. The lowest grain yield (3.40 t ha −1 ) was recorded in W 5 (unweeded control) treatment. The lowest straw yield (4.31 t ha −1 ) was also observed in W 5 (unweeded control) treatment because of the smallest plant (106.97 cm) and lower number of total tillers hill −1 (7.20). Therefore, 80 kg N ha −1 along with three hand weedings at 20, 35 and 50 DAT may be used for obtaining the highest grain and straw yields of BRRI dhan46.

A bioequivalence study of a local antifungal drug, fluconazole (FlunacTM), was compared with that of innovator product DiflucanTM. The study was conducted on 15 healthy volunteers and single cross-over dose of 150 mg fluconazole was administered orally. Two milliliter of blood was collected at different time intervals for 96 hours. The drug was extracted by liquid-liquid extraction and estimated by high performance liquid chromatography with diode array detector (260 nm). The chromatographic separation was accomplished using C18 analytical column with a mobile phase consisting of water and acetonitril (80:20, v/v). The Cmax of DiflucanTM and FlunacTM was 2.48 ± 0.29 g/mL and 2.23 ± 0.29 g/mL respectively. The Tmax of DiflucanTM and FlunacTM was 2.18 ± 0.98 hours and 2.56 ± 0.81 hours respectively. The area under the curve (0 to 96 hours) of DiflucanTM and FlunacTM was 73.28 ± 13.80 hours/mL and 74.49 ± 16.03 hours/mL. The half-life of both the drugs was 44.59 ± 13.79 hours for DiflucanTM and 42.73 ± 11.71 hour for FlunacTM. This study shows that FlunacTM is comparable to DiflucanTM in pharmacokinetic aspect.DOI: http://dx.doi.org/10.3329/kyamcj.v2i2.13255KYAMC Journal Vol.2(2) January 2012, 159-163

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of aqueous extract of sorghum crop residues on weed management and crop performance of wheat. The experiment consisted of three varieties of wheat viz., BARI Gom-19, BARI Gom-21, BARI Gom-24 and five different levels of treatments such as no use of aqueous extract, aqueous extract of sorghum crop residues: 1:20 ratio (w/v), 1:30 ratio (w/v), 1:40 ratio (w/v) and hand weeding. The experiment was laid out in a randomized complete block design with three replications. Seven weed species belonging to five families infested the experimental plots. Weed population, weed dry weight and percent inhibition of weed were significantly influenced by aqueous extract of sorghum crop residues and varieties. The maximum weed growth was noticed with the variety BARI Gom-19 and the minimum was found in the variety BARI Gom-21. The grain yield as well as the other yield contributing characters produced by BARI Gom-21 was the highest among the studied varieties. The highest percent inhibition for all of the weeds was found in hand weeding treatment. The second highest percent weed inhibition was occurred in aqueous extract of sorghum crop residues @ 1:20 ratio (w/v) treatment which was 51.81, 51.10, 52.90, 55.58, 75.27, 73.83 and 53.85 percent for bathua (Chenopodium album), mutha (Cyperus rotundus), durba (Cynodon dactylon), biskatali (Polygonum hydropiper), angta (Paspalum scrobiculatum), tit begun (Solanum torvum) and shama (Echinochloa crusgalli) respectively. The highest loss of grain yield was obtained where no aqueous extract of sorghum crop residues were used. The highest yield and yield attributes were observed where hand weeding is done followed by the application of aqueous extract of sorghum crop residues @1:20 ratio (w/v). Wheat var. BARI Gom-21 with all treatments produced the highest grain and straw yield among the treatment combination. The results of this study indicate that different amount of aqueous extract of sorghum crop residues showed potential activity to suppress weed growth and it has significant effect on the yield of wheat. Therefore, aqueous extract of sorghum crop residues might be used as an alternative way for weed management in effective and sustainable crop production Bangladesh Agron. J. 2018, 21(2): 87-95

Crop allelopathy may be useful to minimize serious problems in the present agricultural production such as environmental pollution, unsafe production, human health concerns, depletion of crop diversity, soil sickness and reduction of crop productivity. In this phenomenon an experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of crop residues of mustard on weed management and crop performance of T. aman rice. The experiment consisted of three cultivars of T. aman rice viz., BR11, BR23 and BRRI dhan49 and five different level of mustard crop residues such as no crop residues, mustard crop residues @ 0.5, 1.0, 1.5 and 2.0 t ha -1 . The experiment was laid out in a randomized complete block design with three replications. Five weed species belonging to three families infested the experimental plots. Weed population, weed dry weight and percent inhibition of weed were significantly influenced by mustard crop residues and cultivar. The maximum weed growth was noticed with the cultivar BR23 and the minimum was found in the cultivar BR11. The grain yield as well as the other yield contributing characters produced by BR11 was the highest among the studied varieties. The highest percent inhibition of 71.17, 69.19, 80.88, 70.48 and 86.97 was in Shama (Echinochlo acrusgalli), Panishapla (Nymphaea nouchali), Panichaise (Scirpus juncoides), Panikachu (Monochoria vaginalis) and Susnishak (Marsilea quadrifolia), respectively which was caused by the application of mustard crop residues @ 2 t ha -1 . The highest loss of grain yield was obtained where no crop residues were incorporated. The highest numbers of tillers hill -1 , numbers of grains panicle -1 , 1000-grain weight, grain yield, straw yield were observed where mustard crop residues were incorporated @ 2.0 t ha -1 . BR11 cultivar with all treatments produced the highest grain and straw yield among the treatment combination. The results of this study indicate that different amount of mustard crop residues showed potential activity to suppress weed growth.

The effect of green manure and nitrogen fertilizer applications on rice performance and post-harvest nutrient status of the soil was studied at the Regional Wheat Research Station of Bangladesh Agricultural Research Institute (BARI), Shyampur, Rajshahi, Bangladesh. The experiment comprised two sets of treatments: (i) green manure application (Crotalaria jusncea, Sesbania aculeata, Sesbania rostrata,Vigna radiata, and Phaseolus mungo) and (ii) application of different nitrogen levels (0, 40, 80, and 120 kg ha −1 ). Both treatments had a significant effect on the growth and yield of transplanted aman (T. aman) rice. We show that soil fertility can be maintained and rice yield can be improved through incorporation of green manuring and nitrogen fertilizer management. Green manure and nitrogen management generated positive responses in important morpho-physiological traits such as leaf area index (LAI), specific leaf area (SLA), crop growth rate (CGR), leaf relative growth rate (LRGR), leaf weight ratio (LWR), and net assimilation rate (NAR), which may result in a greater contribution of yielddetermining traits and eventually higher grain yield. The results indicate that all green manures in combination with higher N levels accelerate SLA, LWR, LAI and CGR. Better performance of potential yield-contributing characters and relatively higher nitrogen uptake and higher N and protein content in grain and straw were found in combination with all green manure and higher N level treatments. An increasing level of post-harvest soil nitrogen content was observed with the application of higher levels of nitrogen in combination with green manures. Therefore, green manuring in combination with judicial nitrogen fertilizer management is deemed necessary for sustainable T. aman rice cultivation.

A study was conducted for two consecutive years to determine the yield and system productivity of two cropping patterns viz. IP: (Wheat - Jute - T. aman) improved pattern with improved management practices and FP: (Fallow - Fallow - T. aman) farmers’ pattern with farmers’ management practices in char (adjacent to the river) area of Netrakona region of Bangladesh. The experimentswere laid out in a randomized complete block design with 10 dispersed replications at a farmer’s field. The two years mean data showed that the total component crops of IP (wheat-jute-T. aman rice) gave higher yield as well as a by-product in both years. The higherrice equivalent yield (10.52 and 10.63 tha-1), production efficiency (30.13 and 30.43 kg ha-1 day-1) land-use efficiency (87.13 and 87.84%)and benefit cost ratio (2.15 and 2.11) pointed out the dominance of the improvedpattern over the farmer’s existing pattern. Higher rice equivalentyield signified that improved cropping pattern (Wheat - Jute -T. aman) could be appropriate in Netrakona region for rising crop productivity andcropping intensity.The higher production efficiency, land use efficiency and benefit cost ratio indicated the superiority of the improved pattern over the farmers’ practices.It can be concluded that farmers of the char area of the Netrakona region might follow wheat (var. BARI Gom-26) - jute (var. O-9897) - T. aman (var. BRRI dhan49) cropping system in char land for higher productivity and profitability.