An experiment was carried out to find suitable ratio of inorganic fertilizer and compost, which could give an economic yield of onion (cv. Jaffna Local). This experiment was designed in a Randomized Complete Block Design with four replicates. Treatments were recommended dosage of inorganic fertilizers as a control (T 1), ¾ fold of the control treatment + compost (2 t ha-1) (T 2), ½ fold of the control treatment + compost (4 t ha-1) (T 3), ¼ fold of the control treatment + compost (6 t ha-1) (T 4) and the compost alone (8 t ha-1) (T 5). These were applied as basal application of fertilizer in this experiment. The results of this study revealed that there were significant (P<0.05) differences in the numbers of leaves and roots between the different treatments during the early stage of growth. Relatively higher yield (5.03 t ha-1) was obtained from the plants treated with inorganic fertilizers alone (T 1), whereas compost alone (T 5) produced the lowest yield (3.43 t ha-1). It was also noted that there were no significant (P>0.05) differences in the yields between T 1 and T 2 as well as T 1 and T 3. The inorganic fertilizers appear to have compensated with slow release of nutrients from the compost and their combined effects would have increased the yield. From this study, it could be stated that half fold of the inorganic fertilizer and compost at the rate of 4 t ha-1 (T 3) could give profitable yield (4.75 t ha-1) and this combination could possibly reduce the cost of production in the cultivation of onion.
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.
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