LBE, INRAE, Univ Montpellier, 102 Avenue des Etangs, Narbonne F-11100, France.
Department of Agricultural and Food Sciences, Alma Mater Studiorum, University of Bologna, Viale G. Fanin, 40, 40127 Bologna, Italy.
Waste Manag. 2020 Nov;117:18-31. doi: 10.1016/j.wasman.2020.07.052. Epub 2020 Aug 14.
In recent years, anaerobic digestion of organic waste (OW) is rapidly appearing as a winning waste management strategy by producing energy and anaerobic digestates that can be used as fertilizers in agricultural soils. In this context, the management of the OW treatment process to maximize agro-system sustainability satisfying the crop nutrient demands represents the main goal. To investigate these traits, two protocols to assess the plant availability of digestate nitrogen (N) and phosphorus (P) were evaluated. With this aim, the N and P availability was determined on 8 digestates and 2 types of digestate-based compost from different OW via sequential chemical extractions (SCE). In addition, the digestates were tested in soil incubations and in plant pot tests with Italian ryegrass and compared with chemical fertilizer and a non-amended control soil. The N extracted from digestates via SCE was related to soil N mineralization and plant N recovery. The C: N ratio had negative impact on mineralized N and its recovery in shoots (Shoots = -0.0085.(C/N)+0.172, r = 0.67), whereas water extractable mineral N was positevely related to the root N apparent recovery fraction (N-ARF) with (Roots = 5E.N+0.0138, r = 0.53). The shoot P-ARF was positively correlated with the inorganic water extractable fraction of P (Shoots =0.1153.HO-P-0.2777.HO-P+0.0249, r = 0.71) whereas the root P-ARF was positively correlated with the less accessible fractions (Roots = (b) 0.0955.NaHCO-P+0.0955.NaOH-P-0.0584NaHCO-P+0.0128, r = 0.8641). Feedstock digestate typology impacted the N and P recovery results leading to a better description of the typology properties and a first nutrients ARF prediction.
近年来，有机废物（OW）的厌氧消化作为一种具有竞争力的废物管理策略，通过生产可用于农业土壤的能源和厌氧消化物而迅速出现。在这种情况下，管理 OW 处理过程以最大限度地提高农业系统的可持续性，满足作物养分需求是主要目标。为了研究这些特性，评估了两种评估消化物氮（N）和磷（P）植物可利用性的方案。为此，通过顺序化学提取（SCE）测定了 8 种消化物和 2 种不同 OW 的基于消化物的堆肥中的 N 和 P 的可利用性。此外，在土壤培养和意大利黑麦草盆栽试验中对消化物进行了测试，并与化肥和未施肥对照土壤进行了比较。通过 SCE 从消化物中提取的 N 与土壤 N 矿化和植物 N 回收有关。C:N 比对矿化 N 及其在地上部的回收有负面影响（地上部= -0.0085.（C/N）+0.172，r=0.67），而可提取的水矿化 N 与根 N 表观回收分数（N-ARF）呈正相关（根部=5E.N+0.0138，r=0.53）。地上部 P-ARF 与 P 的无机可提取分数呈正相关（地上部=0.1153.HO-P-0.2777.HO-P+0.0249，r=0.71），而根部 P-ARF 与较难利用的分数呈正相关（根部=（b）0.0955.NaHCO-P+0.0955.NaOH-P-0.0584NaHCO-P+0.0128，r=0.8641）。原料消化物的类型影响 N 和 P 的回收结果，从而更好地描述了类型特性和养分 ARF 的初步预测。
