• ISSN 1008-505X
  • CN 11-3996/S
GAO Tian-yi, LI Na, PENG Jing, GAO Ming-hui, LUO Pei-yu, HAN Xiao-ri. Effect of consecutive application of biochar on phosphate morphologyand availability in brown soil[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(9): 1451-1460. DOI: 10.11674/zwyf.18405
Citation: GAO Tian-yi, LI Na, PENG Jing, GAO Ming-hui, LUO Pei-yu, HAN Xiao-ri. Effect of consecutive application of biochar on phosphate morphologyand availability in brown soil[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(9): 1451-1460. DOI: 10.11674/zwyf.18405

Effect of consecutive application of biochar on phosphate morphologyand availability in brown soil

  • Objectives Poor soil phosphorus availability and low phosphorus utilization rate are one of the main limiting factors for crop production. As a new soil amendment, biochar has unique physicochemical properties that affect the form and availability of phosphorus. In this study, the effects of biochar on forms and availability of phosphorus in brown soil were studied by analyzing the application of different amounts of biochar to provide a theoretical basis for its rational agricultural use.
    Methods Biochar was applied for consecutive 5 years in a corn field. There were 5 treatments: no fertilizer (CK), single fertilizer NPK (NPK), 1.5 t/hm2 biochar + NPK (C1NPK), 3 t/hm2 biochar + NPK (C2NPK), and 6 t/hm2 biochar + NPK (C3NPK). Jiang Bofan and Gu Yichu's soil inorganic phosphorus grading and Bowman-Cole's soil organic phosphorus grading methods were used. The contents of different forms of phosphorus were determined.
    Results The application of biochar for 5 consecutive years significantly increased the total phosphorus, available phosphorus content and phosphorus activation coefficient in brown soil, significantly increased the content of Ca2-P, Ca8-P, Al-P, Fe-P, LOP (labile organic phosphorus) and MLOP (moderately labile organic phosphorus), and decreased the content of MROP (moderately resistant organic phosphorus). Among the phosphorus components, MLOP and O-P accounted for the largest proportion of organic phosphorus and inorganic phosphorus, which was 64.32% and 28.43%, respectively. The application of biochar significantly increased the ratio of Ca2-P and Ca8-P in inorganic phosphorus. The correlation coefficient between Al-P and available phosphorus was 0.945. The direct path coefficient of LOP, Al-P and MROP to available phosphorus was significant. The determination coefficients of available phosphorus for Al-P and HROP (highly resistant organic phosphorus) were 0.295 and –0.130, respectively, which were the main decision factors and main limiting factors for available phosphorus in brown soil.
    Conclusions The application of biochar can accumulate and increase the activity of phosphorus in brown soil. Al-P and LOP are the active components of phosphorus in brown soil with use of charcoal. Increasing Al-P content and limiting HROP content are the main mechanisms for biochar to enhance phosphorus availability in brown soil.
  • loading

Catalog

    Turn off MathJax
    Article Contents

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return