What question did this study set out to answer?

The study aimed to evaluate the impact of protein-rich supplements on the agronomic and nutritional quality of Stropharia rugosoannulata.

February 8, 2026Open Access

Protein-Rich Supplements Improved the Agronomic and Nutritional Quality of Stropharia rugosoannulata

Key Points

The study aimed to evaluate the impact of protein-rich supplements on the agronomic and nutritional quality of Stropharia rugosoannulata.
Evaluated three types of protein-rich supplements: feather meal, soybean meal, and a mixture of both.
Measured properties such as total nitrogen, C/N ratio, and fruiting body yield.
Analyzed nutritional components, including crude fat, crude protein, and amino acids.
Protein-rich supplements significantly increased total nitrogen and reduced the C/N ratio.
Feather meal resulted in the highest yield at 6.80 kg·m−2.
Enhanced nutritional contents were observed, including increased crude protein and total amino acids, with significant improvements in antioxidant activity.

Abstract

Stropharia rugosoannulata is efficiently cultivated using agricultural and forestry wastes, such as sawdust and straw, and has gained popularity in China for its rich nutrition and excellent taste. However, traditional cultivation methods, which lack nitrogen supplementation, often result in low yields and poor fruiting body quality. This study evaluated the effects of protein-rich supplements (PRSs)—feather meal (FM), soybean meal (SM), and their mixture (FS)—on substrate properties, yield, and nutritional quality. PRS significantly increased substrate total nitrogen (TN), reduced the C/N ratio, and improved fruiting body yield, with FM achieving the highest yield (6.80 kg·m−2). Moreover, FM and FS significantly enhanced the contents of crude fat, crude fiber, crude protein, crude polysaccharides, total amino acids (TAAs), essential amino acids (EAAs), and umami amino acids (p < 0.05). Additionally, FS significantly enhanced antioxidant activity and 1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity of crude polysaccharides (p < 0.05). These findings demonstrate the potential of PRS to optimize S. rugosoannulata cultivation, offering a cost-effective strategy to improve commercial production.

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