The aim of this study is to evaluate the suitability of a protein hydrolysate (PH) prepared from waste leather as a nitrogen source supplement during rice straw (RS) composting, with urea-amended treatment as a control. Changes in several primary physicochemical properties were similar between the two processes; both resulted in matured end-products within 65 days. However, the PH as a nitrogen source provided some remarkable benefits compared with urea-amended treatment; the PH supplement yielded a higher temperature increase rate (1.85°C/h vs. 1.07°C/h) at the start-up of RS composting process. The efficiency of volatile solid degradation was higher too (48.04% vs. 46.98%, mainly attributed to greater cellulose degradation). Application of the end-product of PH-amended treatment in a pot experiment yielded the highest Chinese cabbage biomass relative to the blank and chemical fertilizer treatments. These results prove the feasibility of RS composting using PH as a nitrogen source, evidenced by improved composting efficiency and enhanced quality of the end-product.

中文翻译：

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添加蛋白质水解物作为氮源提高稻草堆肥效率

本研究的目的是评估从废皮革制备的蛋白质水解物 (PH) 作为稻草 (RS) 堆肥过程中氮源补充剂的适用性，尿素改性处理作为对照。两个过程之间几个主要理化性质的变化相似；两者都在 65 天内产生成熟的最终产品。然而，与尿素改性处理相比，PH 作为氮源提供了一些显着的好处；在 RS 堆肥过程启动时，PH 补充剂产生了更高的升温速率（1.85°C/h 对 1.07°C/h）。挥发性固体降解的效率也更高（48.04% vs. 46.98%，主要归因于更大的纤维素降解）。相对于空白和化肥处理，在盆栽试验中应用 PH 修正处理的终产物产生了最高的大白菜生物量。这些结果证明了使用 PH 作为氮源的 RS 堆肥的可行性，这可以通过提高堆肥效率和提高最终产品的质量来证明。