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The present study was carried out to evaluate the effect of nitrogen on growth and yield of chili (Capsicum annuum L.) under rooftop conditions. The single factorial experiments were laid out in Randomized Complete Block Design (RCBD) with three replications. Four levels of nitrogen N0: 0 kg N ha-1, N1: 90 kg N ha-1, N2: 110 kg N ha-1 and N3: 130 kg N ha-1 were used in this experiment. Growth and yield contributing parameters significantly influenced by different doses of nitrogenous fertilizers. The dose of N2 gave the highest plant height (80.97 cm) and most of the morphological parameters increased with increasing nitrogen levels up to N2. The treatment N3 gave the highest fruit length (4.93 cm), yield of fruits plant-1 (165.33 gm), average fruit yield plot-1 (0.66 kg), individual fruit weight (1.97 g) and average fruit yield (5.533 kgha-1). Based on the present results, it can be suggested that use of 130 kg N ha-1 increased plant growth and fruit yield of chili in rooftop garden.

Impact assessment of wastewater on soil is important to diagnose the potential of wastewater irrigation. By taking this idea into consideration, an experiment was conducted to investigate the chemical and solute-transport properties of soils collected from wheat fields irrigated with sugar mills’ wastewater at North Bengal Sugar Mill (NBSM) and Faridpur Sugar Mill (FSM) of Bangladesh. Soil samples were collected from experimental sites where wheat was grown under both irrigation and fertilizer treatments. The split-plot design with three replications of irrigation (main plot) and fertilizer (sub-plot) were used. Irrigation and fertilizer treatments were defined as I1 = irrigation with fresh water, I2 = irrigation with mixed water (fresh water: wastewater = 1:1) and I2 = irrigation with wastewater; F1 = Full dose fertilizer, F2 = Half dose fertilizer and F3 = No application of fertilizer. Soil samples were chemically analyzed to find their chemical properties and a breakthrough experiment was done to find the solute transport properties. Significant effects were observed for soil chemical properties at both NBSM and FSM sites. At NBSM site, organic-C and S contents of soil increased under I3 treatment, where as total-N, P, K and Mg contents increased under I2 treatment. Similarly, Na and Ca contents at FSM site slightly went downunder I3 treatment. Application of fertilizer also significantly affected soil properties at both sites. Under full dose fertilizer application (F1) EC, P, K, S, Ca and Mg contents of the soil increased, however, Na content decreased at both sites. Interaction of irrigation and fertilizer treatments also had significant effects on all the soil chemical parameters except organic-C and total-N content of the soils at both sites. Among solute transport properties pore-water velocity, dispersion coefficient and mean solute travel time increased in I3 compared to I1 at NBSM site, but the reverse was observed at FSM site. Asian Australas. J. Biosci. Biotechnol. 2016, 1 (3), 521-532

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