脱硫副产物改良苏打碱土的田间效应分析

通过2年的田间小区向日葵种植试验,分析了脱硫副产物改良苏打碱土对ESP、SAR、pH值和向日葵产量的影响,提出了脱硫产物改良苏打碱土的合理施用量和施用方式。研究设4个脱硫副产物水平(18750、22500、26250和30000kg/hm2)。研究结果表明:施加脱硫副产物后各处理的ESP、SAR和pH值都明显降低,向日葵产量明显提高;经过2年的改良后,耕作层土壤的ESP、pH和SAR分别小于15、8.5和13,向日葵产量达到1100kg/hm2;脱硫副产物存在利用效率问题,实际选用的脱硫副产物用量应在理论计算量的基础上乘以修正系数1.32;对于碱化度较高的土壤,应选用分批连续施用的方式,以避免形成盐害。

The Optimum Field Application Mode of Sodic Soils Reclaimed with By-product from Flue Gas Desulphurization

The field plot experiment of sunflower was adopted to analyze the effects of application of BFGD on ESP,SAR,pH and sunflower production,and find the suitable application rate and application mode of BFGD when it was used to ameliorate sodic soils.The results show that ESP,SAR and pH decreased significantly and sunflower production were improved after BFGD were applied in all the treatments.In the 0～20 cm soil layer ESP<15,in the 0~50 cm soil layer pH<8.5 and in the 0～40 cm soil layer SAR<13.BFGD had the question of utilization efficiency,and the application rate should be multiplied by the coefficient on the basis of calculating application rate.For the sodic soil of having high ESP,in order to avoid forming salt accumulation BFGD should be used in succession and in batch.