Studies on the use of saline heterologous aquaculture wastewater to develop biofuel plant(Jerusalem artichoke) in salinized coastal areas

A field-trial was conducted on the use of agricultural wastewater to the salt-tolerant energy plants(Jerusalem artichoke) cultivation;meanwhile,soil properties,plant growth and yield were investigated,and than watersuit visual model was used to the security assessment on the soil-plant systems.The results showed that: heterologous wastewater irrigation could cumulate salts obviously,particularly for the high salinity of the prawn wastewater;the soil salinity was as high as 2.69 g/kg;and soil alkalization(SAR) in sea cucumber aquaculture wastewater was the highest,and its value reached 7.4(mmol/L)1/2.Stem and leaf growth of Jerusalem artichoke was inhibited under the aquaculture wastewater irrigation,but root growth could be promoted.Compared with fresh water irrigation,in addition to shrimp wastewater because of high salinity affecting Jerusalem artichoke tuber production,the yield in other two aquaculture wastewater irrigation treatments had no impacts on the Jerusalem artichoke production.The results further show that,provided the Jerusalem artichoke tuber yield as a benchmark,the threshold salt tolerance of the Jerusalem artichoke was 24.65 dS/m,and aquaculture wastewater for irrigation does not pose a threat to soil alkalization.Therefore,agreeable salinity of aquaculture water could be used to irrigate Jerusalem artichoke with high yield as well as soil safety.