Journal of Northern Agriculture ›› 2024, Vol. 52 ›› Issue (4): 50-58.doi: 10.12190/j.issn.2096-1197.2024.04.06

• Soil and fertilizer·Physiology and biochemistry • Previous Articles     Next Articles

Impacts of combined application biochar and organic fertilizer on saline-alkali soil amendment and sunflower yield

YANG Yang1,2, LAI Liming1,2, WANG Jing1,2, FU Yanqiu3, SHI Ruijie1, GAO Lele1   

  1. 1. Agriculture Department, Hetao College, Bayannur 015000, China;
    2. Research Center of Soil Resource Comprehensive Utilization and Ecological Environment in Western Inner Mongolia, Hetao College, Bayannur 015000, China;
    3. Agricultural and Animal Husbandry Law Executing Administration Detachment of Chifeng City, Chifeng 024000, China
  • Received:2024-04-24 Online:2024-08-20 Published:2024-11-22

Abstract: 【Objective】To explore the effects of biochar and organic fertilizer combined application on the chemical properties,nutrient content,and sunflower yield of saline-alkali soil in Hetao Irrigation District,Inner Mongolia,and provide reference for soil improvement and utilization in the region.【Methods】The experiment was conducted from June to October,2022 at the Hetao College Experimental Base in Bayannur City,Inner Mongolia Autonomous Region. Five treatments were set up,including no fertilization and biochar(CK),conventional chemical fertilizer application by farmers(CF),conventional chemical fertilizer application combined with biochar(CFC),30% organic fertilizer replacement chemical fertilizer with biochar(MFC) and 50% organic fertilizer replacement chemical fertilizer with biochar(OFC). The effects of each treatment on the pH value,EC,CEC,ESP,soluble salt ion content,nutrient content,and sunflower yield of saline-alkali soil were analyzed.【Results】Compared with CK,no significant differences in soil pH values(P>0.05). Soil EC was significantly reduced by 83%,78%,73% in the CFC,MFC,OFC treatments(P<0.05),respectively.Soil CEC was significantly increased by 38%,57%,53%(P<0.05). Soil ESP was significantly reduced by 40%,36% in the MFC,OFC treatments(P<0.05). MFC and OFC treatments soil K+ content was significantly increased by 100% and 138%(P<0.05),Ca2+ content was significantly increased by 61% and 66%(P<0.05),Mg2+ content was significantly increased by 71% and 238%(P<0.05),SO42- content was significantly increased by 11% and 12%(P<0.05),Na+ content was significantly decreased by 6% and 3%(P<0.05). CFC,MFC,and OFC treatments soil nutrient content was significantly improved(P<0.05). The MFC treatment had the highest soil total nitrogen,alkaline hydrolysis nitrogen,rapidly available phosphorus,rapidly available potassium content,at 1.13,69.33,11.74,156.46 mg/kg,respectively. The OFC treatment had the highest soil total phosphorus and organic matter content,at 0.49 and 13.44 g/kg,respectively. Single panicle grain weight of sunflower was significantly increased by 30%(P<0.05) and hundred-grain weight by 22%(P<0.05) in the MFC treatment,leading to a highest yield,at 3 362.26 kg/hm2.【Conclusion】30% organic fertilizer replacement chemical fertilizer with biochar could significantly increase the CEC,K+,Ca2+,Mg2+ content and nutrient content,and significantly reduce the soil EC,ESP and SO42-、Na+ content,the sunflower yield isignificantly increase. It is suitable for the improvement and utilization of saline-alkali soil in Hetao Irrigation District,Inner Mongolia.

Key words: Saline-alkali soil, Biochar, Organic manure, Soil chemical properties, Sunflower yield

CLC Number: 

  • S156.4