Pengaruh kadar krom limbah lumpur industri penyamakan kulit terhadap pertumbuhan dan hasil tanaman sawi

The aim of the experiment was to study the effect of chrom content of leather tanning industry waste ti the growth and yield of mustards. The experiment used factorial design 2x3 factors, and 2 control were used and the treatments were arranged in a complete randomized design with 15 experimental pots for replication. The first factor was variety of mustard; consisting of 2 kinds, i,e, green mustard (caisim) dan bitter mustard (leaf mustard). The second factor was the amount of leather tanning industrial waste, consisting of 3 levels, i.e.500, 1000 and 1500 mg/kg Cr/polybag (125,250, 375 g waste mud/polybag). Waste mud was added in the polybag after 1 week plantation. Controls were madewith code S1L1C0, S2L1C0 whereas L1C0 = without waste mud added. The observed parameters were plant height, leaf number, fresh weight (shoots-roots), dry weight (shoots-roots), leaf area, neg assimilation rate, relative growth rate and leaf area ratio. The results showed that there were interactions between varieties of mustard and the amount of leather tanning industrial waste for all parameters. The addition of leather tanning waste until 1000 mg/kg soil gave fine growth and yields for all mustard varieties.