不同有机改良剂对盐碱地菊芋产量及土壤理化性质的影响OACSTPCD

The experiment was carried out in typical saline-alkali lands of the Yellow River Delta.Five treatments were designed including no fertilizer as the control(CK),conventional fertilization(F),commer-cial organic manure(M),biochar-base organic amendment(T1)and salt-resistant amendment(T2),and Helianthus tuberosus L.Nanyu 1 was used as the experimental variety.The results showed that dry matter a-mount at seedling stage and tuber yield at maturity stage of H.tuberosus were significantly influenced by the application of organic amendments,and those of T1 treatment were the highest and significantly increased by 76.4% and 36.2% ,and 38.7% and 25.1% compared with CK and F treatment,respectively.Compared with CK,the soil pH value of 0～30-cm layer decreased significantly at seedling stage under T1 treatment.Com-pared with CK and F treatments,M,T1 and T2 treatments significantly reduced the soluble salt content in 0～20-cm soil layer at seedling stage by more than 8.3% ,and the salt reduction effect of T1 treatment was better than that of M and T2 treatment.The content of soil organic matter in 0～10-cm layer under M,T1 and T2 treatments were significantly increased by 15.1% ,20.7% and 21.0% compared with CK treatment,respective-ly.T1 treatment significantly increased the contents of soil alkali-hydrolytic nitrogen,available phosphorus and available potassium in 0～20-cm layer compared with CK treatment,while M treatment significantly increased the contents of soil available phosphorus and available potassium in 0～20-cm layer.In conclusion,the appli-cation of biochar-base organic amendments were superior to decreasing soil salinization,promoting strong seed-ling culture and increasing yield of H.tuberosus.