EFFECT OF COMBINED APPLICATION OF ORGANIC AND INORGANIC FERTILIZER AND IRRIGATION ON LEAD TRANSPORT CHARACTERISTICS IN SOIL-WHEAT SYSTEMS

Fertilization and irrigation greatly affect the soil heavy metals bioavailability and thereby the transport and uptake by plants. In this study, pot experiments of wheat were conducted to investigate the effects of fertilization five organic materials such as corn straw, rice straw, pig manure, sludge, partially instead of chemical fertilizer, and irrigation on the transport characteristics of lead in the soil-wheat system. The results showed that compared with control, the combined application of organic and chemical fertilizer and irrigation (OCI) increased the fresh weight and dry weight of wheat by 0 similar to 51% and 0 similar to 46%, respectively. The OCI mode inhibited the accumulation of lead by wheat, with the decreases of 0.01%-7.7% in the wheat lead accumulation. The bioavailable parts of lead in soil was reduced by 3%-23%. The combined application of rice straw and flat year water irrigation performed well in the inhibition of lead transport from soil to wheat. This study provides an effective fertilization and irrigation mode for the reduction of heavy metal transport from soil to crop.