Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (11): 2104-2115.DOI: 10.3969/j.issn.1004-1524.2021.11.13

• Environmental Science • Previous Articles     Next Articles

Effects of solid-digestate biochar application on soil nitrogen leaching and cabbage yield with liquid-digestate irrigation in karst-mountainous region of southwest China

JIANG Tao1,2,3(), WANG Liguo1,2,3, SUN Fangfang1,2,3, CHENG Jianbo1,2,3,*(), HE Tengbing1,2,3, QIN Song4, FAN Chengwu4, YIN Wenfang1,2,3   

  1. 1. College of Agriculture, Guizhou University, Guiyang 550025, China
    2. Institute of New Rural Development, Guizhou University, Guiyang 550025, China
    3. Guizhou Engineering Research Center for Technologies in Control and Recycling of Livestock and Poultry Breeding Waste in Mountain Area, Guiyang 550025, China
    4. Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China
  • Received:2021-02-19 Online:2021-11-25 Published:2021-11-26
  • Contact: CHENG Jianbo

Abstract:

In order to explore the effects of solid-digestate (SD) biochar application on soil nitrogen (N) leaching and cabbage yield with liquid-digestate irrigation in the karst-mountainous region of southwest China, a pot experiment was performed in a greenhouse to simulate liquid-digestate irrigation, and SD biochar was incorporated into either yellow soil or calcareous soil at the rates (mass fraction) of 0 (CK), 1% (BC1), 2% (BC2), 4% (BC4), and 6% (BC6), respectively.It was shown that no significant effects of biochar application on N leaching and cabbage N uptake were measured in yellow soil. However, in calcareous soil, the leaching of total nitrogen, NH 4 +-N, NO 3 --N, and NO 2 --N were lowered by 12.06 kg·hm-2 (equivalent to 35.89%), 11.82 kg·hm-2 (equivalent to 52.99%), 1.14 kg·hm-2 (equivalent to 25.53%), 0.103 kg·hm-2 (equivalent to 23.25%), respectively, under BC6 treatment as compared with CK. The N uptake of cabbage was increased by 9.25-19.13 kg·hm-2 with SD biochar application, and the highest N uptake was found in the BC6 treatment, which was 60.15 kg·hm-2. The yield of cabbage was increased by 29.82%-68.78%, 23.58%-79.07% in the yellow soil and calcareous soil, respectively, and the highest yield in the yellow soil and calcareous soil was recorded under BC4 and BC6 treatment, respectively, which was 13.81, 9.01 t·hm-2, respectively.

Key words: liquid-digestate irrigation, soil-digestate biochar, nitrogen leaching, cabbage yield, enzyme activity, karst-mountainous region

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