An experiment was carried out to determine the effect of four different media based hydroponics on plant growth, yield and nutritional values at Biochemistry laboratory of Patuakhali Science and Technology University (PSTU), Bangladesh during November 2014 to April 2015. Tomato plants were grown in closed soilless system where Hoagland solution as nutrient solution and jute fiber, cotton (jhut), coconut husk as substrate. Among four types of media, the media composed with Hoagland solution and jute fiber showed good impact on growth and nutritional values than the other three media (media of Hoagland solution with coconut husk, Hoagland solution with cotton and only Hoagland solution. It was revealed that the highest plant height, yield, vitamin C, fruit protein, fat and fiber content of all were related to media combination of jute fiber and Hoagland solution. Among all the verities, the highest plant height (106 cm), yield (5.3 kg plant -1 ), fruit Vitamin C content (64.54 mg 100 g -1 ), fruit protein (17.67 %), fat (5.2%) and fiber (7.9%) content was recorded from Patharkuchi tomato variety.

An experiment was conducted to identify the hydroponic culture based suitable media for the production of Zucchini Squash in the Biochemistry Laboratory, Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh during 2014. Zucchini plant (Cucurbita pepo L.) were grown in closed soilless systems to determine the effect of four different hydroponics media on plant growth, yield and nutrient contents (fruit moisture content, ascorbic acid content on fruit, fruit protein content, protein content in leaves). Three types of substrates (coconut husk, jute, cotton) along with Hoagland solution were used in this experiment. Result revealed that media using Jute fiber showed significant effect on plant growth and nutritional values than the other media (media of cotton with Hoagland solution, coconut husk with Hoagland solution and only Hoagland solution). The plant grown using jute media showed the highest plant height (60.33 cm), number of leaves (17.33), yield (1.5 kg plant -1 ), fruit moisture content (97.33%), Ascorbic acid content in fruit (28.73 mg 100g -1 ), protein percentage in fruit (1.406%) and percentage (1.326%) in leaves than the other media. Therefore, with the controlled nutrient supply, less expense, less labor, no use of pesticides or fertilizer with controlled environment the use of jute fiber as a substrate with Hoagland solution can be an effective one.

An experiment was carried out at the Agronomy Field, Sher-e-Bangla Agricultural University, Dhaka during November 2009 to July 2010 to study the effect of variety and varying levels of nitrogen application to ratoon crop of boro rice. Four varieties (BRRI hybrid dhan2, BRRI dhan29, BRRI dhan35 and BRRI dhan47) and four doses of nitrogen (0%, 25%, 50% and 75% N of recommended dose) were tested. These doses of N fertilizer were applied to the ratoon crop just after harvesting of the main crop leaving 15 cm stuble height above the ground level. Among the main crop BRRI hybrid dhan2 produced significantly highest grain yield (7.037 t ha-1). In the ratoon crop grain yield of BRRI hybrid dhan2 and BRRI dhan29 with all levels of N application produced significantly higher grain yield (710-917 kg ha-1). So, BRRI hybrid dhan2 and BRRI dhan29 with 25% extra N application could be considered for ratoon cropping. Int. J. Agril. Res. Innov. & Tech. 9 (1): 48-57, June, 2019

Mango fruit consumers often confuse to select exact fruits from markets. A study was conducted to analyze the physical quality and biochemical componentsat different stages ofmango cultivar "Amrapali".The study was conducted at the postharvest laboratory, Department of Horticulture, PSTU during the period from January to December 2015. Stage-1 was marked when the peel color was dark olive green and turning toyellow at the seedand the subsequent maturity stages determined at 2-days intervals as stage-2 was olive, stage-3 was apple green, stage-4 was brown, stage-5 was saddle brown and stage-6 was dark golden rod in color. At each maturity stages, physical (peel color, firmness and weight loss) and biochemical (anthocyanin content, titratable acidity, pH, total soluble solids, ascorbic acid, reducing sugar, non-reducing sugar and total sugar) maturity indices were determined. The pH (4.54), anthocyanine content (430 mg/100 g), TSS (24.33%), reducing sugar (7.56%), non-reducing sugar (5.84%) and total sugar (13.40%) were significantly highest at stage-6 (dark golden rod colour). The titratable acidity (0.30%) and ascorbic acid (25.29 mg/100 g) were significantly highest at stage-1 (dark olive green). Firmness decreased gradually with the advancement of maturation and flesh color turned dark olive green to dark golden rod. Total soluble solids were increased while TA was gradually decreased with increase of maturity. Dark olive greencolour stage (stage-1) is suitable for harvesting and transportation due to highest physical qualityand dark golden rod colour stage(stage-6) is suitable for consumption due to highest biochemical composition.