The Influence of Humic Acid and Nano-superabsorbent Application on the Growth of Brassica Napus L. in Lead-contaminated Soil

摘要

Toxic heavy metals are continuously released into the environment. Mining and industries can result in heavy metal contamination of urban and agricultural soil. Lead, because of its great variety of applications, is a common environmental contaminant widely distributed around the world. For the purpose of improving the lead-contaminated soil for agriculture, we have tested productive specie with high yield, the Rapeseed (Brassica napus L.). In particular, we have studied the effect of humic acid and nanosuperabsorbent (hydrogel) on plant height, number of pods per plant, shoot dry weight and root dry weight. The treatments (with and without nano-superabsorbent, with and without humic acid) caused significant differences between treated and control plants. The effect of nano- superabsorbent on plant height, number of pods per plant, plant root and shoot dry weight was significant in levels of 1% and 5%, respectively. The usage of humic acid showed significantly negative effect on number of pods per plant, plant height, shoot dry weight (p<0.01) and root dry weight (p<0.05). The results of the pot experiment suggested that B. Napus L. Is suitable for being cultivated in moderately lead-contaminated soils (417 mg.kg-1 Pb) and nanosuperabsorbent could have positive effect on plant growth indexes.