The research was aimed at evaluating the growth and yield performance of tomato under different water regimes and different ricehusk biochar application rates. A trial was conducted during the 2022 dry season at Wudil in Kano State. The experiment was laid out in a Split Plot design. The experiment consisted of two factors; biochar at six different application rates (15, 13.75, 12.5, 11.25, 8.75 and 5tons/ha) and irrigation regimes (100, 50 and 25% irrigation). Which were combined to produce 18 treatments? Prior to planting, fifteen soil samples (0-15 cm) were collected randomly and bulked to obtained three composite soil samples for physical and chemical analysis using standard laboratory procedures. Growth and yield parameters were taken from 2WAT at 2 weeks intervals in each plot and. The result showed that aplication of biochar has a significant effect on crop growth and yield especially at 50% irrigation. Therefore it is recommended that 15tons/ha of rice husk biochar at 50% irrigation is very suitable for use by farmers in the study area.

Industries that used nanoparticles has wide applications, among them are; in the production of cosmetics and pharmaceutical industries, therapies, and much more. Plants, algae, or microorganisms can be used in the synthesis nanoparticles, and combustion byproducts can also be used to make nanoparticles. In this study, silver nanoparticles (NPs-Fe) were synthesized from rosemary leaf extracts (Rosmarinus officinalis L) in order to create an antibacterial compounds for use as a fruit preservative. By using UV-VIS spectroscopy and phytochemical analysis to analyze NPs-Fe qualitatively and quantitatively, which are revealed an absorption in the 389-418nm regions, which matches the resonance of their surface plasmons. The size and morphology of the NPs-Fe were also determined using scanning electronic microscopy, which revealed a spherical shape with a diameter of 23nm, while the bioactivity exam to shows inhibitory effect against several pathogenic bacteria.