Effect of Agaricus spent compost on the productivity and soil environment for low-input cultivation of forage rice

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  • 低投入飼料用水稲栽培の生産性と土壌環境に対するヒメマツタケ廃菌床の効果

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Abstract

To evaluate the effects of Agaricus spent compost(ASC) on crop productivity and the soil environment, we cultivated "Momiroman", a new high-yielding rice cultivar for feed use, in a rice paddy amended with 2 t/10 a ASC. The number of bacteria, actinomycetes, and filamentous fungi increased. In particular, the proportion of actinomycetes was markedly increased in the ASC-treated paddy soil. Soil hardness, humic content, and inorganic nitrogen were also significantly higher in ASC-treated rice paddy fields than those of the control soil. However, the cation exchange capacity and total exchangeable bases were not affected by ASC treatment. Plant height, culm length, ear length, number of ears per plant, grain weight, and total crop weight of rice plants grown in ASC-treated soil were higher than those of the untreated control group. Total crop weight was 1495 kg/10 a for the control group and 1716 kg/10 a for the ASC group, representing a 14.8% increase. With regard to internal quality, the branched-chain amino acids, isoleucine, leucine and valine were increased. These findings indicate the application of ASC to rice paddy field soil is effective to the productivity and quality of the rice crop.

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