Drip fertigation with food waste biogas effluent in a humid area is possible but challenging due to increased soil soluble sodium
Drip fertigation with food waste biogas effluent in a humid area is possible but challenging due to increased soil soluble sodium
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DOI：
10.1016/j.agwat.2023.108600
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发表时间：
2023-12
影响因子：
6.7
通讯作者：
Na Li;Hui Xi;Yang Zhou;Man Yu;Zhenhua Hu;Xijing Chen
中科院分区：
文献类型：
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作者：
Na Li;Hui Xi;Yang Zhou;Man Yu;Zhenhua Hu;Xijing Chen
为了评估在潮湿地区使用食物垃圾沼气废水作为肥料时土壤盐度和盐度淋滤的变化，在2020-2022年进行了一项田间试验，重点研究了不同比例的沼气废水对西兰花的滴灌施肥。5个处理分别为0% （CF）、25% （T25）、50% （T50）、75% （T75）和100% (T100)，总氮、磷、钾含量相同。监测土壤饱和膏体浸膏（ECe）的电导率、可溶性钠、钠吸附比（SAR）、结构稳定性阳离子比（CROSS）和西兰花产量。电导率为19.0 dS/m的沼液滴灌施肥，随着沼液比例的增加，土壤盐分和土壤蚀色均有所增加，特别是在0 ~ 20 cm土壤剖面。T25、T50、T75、T100治疗组ecvalue是CF治疗组的1.2 ~ 2.2倍。可溶性钠、SAR和CROSS随施肥季节增加而增加。但与CF相比，25-100%的沼液滴灌施肥对西兰花产量影响不显著。在赛季后期，土壤盐分被雨水有效地滤除。经过一个研究年的轮作，不同处理之间的ece几乎没有显著差异，但T100处理的可溶性钠、SAR和CROSS值显著高于CF处理。也就是说，当淡水总施用量（包括降雨和灌溉）大于沼液施用量（即沼液浓度≤75%的灌溉）45-48倍时，可能不会显著增加土壤可溶性钠。综上所述，沼液滴灌施肥可用于湿润地区的西兰花施肥，建议采用≤75%的沼液处理。结合当地降雨深度，沼气出水施用深度≤28-30 mm/年较为可行。
To assess changes in soil salinity and salinity leaching following rainfall when food waste biogas effluent was used as a fertilizer in a humid region, a field experiment was conducted in 2020–2022 focused on broccoli drip fertigation with different percentages of biogas effluent. Five treatments consisted of 0% (CF), 25% (T25), 50% (T50), 75% (T75), and 100% (T100) biogas effluent blended with fresh water, with the same total N, P, and K. The experiment included a control (CK) that consisted of drip irrigation without fertilizer. The electrical conductivity of soil saturation paste extract (ECe), soluble sodium, sodium adsorption ratio (SAR), cation ratio of structural stability (CROSS), and broccoli yield were monitored. Drip fertigation with biogas effluent (electrical conductivity=19.0 dS/m) increased soil salinity and the ECerose as the biogas effluent percentage increased, especially in the 0–20 cm soil profile. The T25, T50, T75, and T100 treatment ECevalues were 1.2–2.2 times those of the CF treatment. Soluble sodium, SAR, and CROSS increased during the fertilization season. However, compared with CF, 25–100% biogas effluent drip fertigation did not significantly affect broccoli yield. During the post season, the soil salinity was effectively leached by rainwater. After one study year of rotation, there was almost no significant difference in ECebetween treatments, but the soluble sodium, SAR, and CROSS values were significantly higher in T100 than in the CF treatment. In other words, when the total applied fresh water amount (including rainfall and irrigation) is more than 45–48 times the biogas effluent application amount (i.e., irrigation with a biogas effluent concentration of ≤75%), it may not significantly increase the soil soluble sodium. In conclusion, drip fertigation with biogas effluent can be used for broccoli fertigation in humid areas, and treatment with≤ 75% biogas effluent is suggested. Combined with the local rainfall depth, a biogas effluent application depth of ≤ 28–30 mm/year may be feasible.