Mulching Effect of Plant Residues on Soybean Growth and Soil Chemical Properties

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The objective of this investigation was to analyze the mulching effect of plant residues on soybean growth and soil chemical properties. 1. The decomposition rate of plant residues applied as a mulch on the soil surface was higher in the order of soybean (Glycine max. L.) > mugwort (Artemisia princeps P.) > black wattle (Acacia mollisima) > Japanese plume-grass (Miscanthus sinensis A.). 2. Soybean grew better with than without treatment with plant residue mulch. Moreover, the nodule weight, nitrogen-fixing activity per plant and specific activity (nitrogen-fixing activity per nodule weight) also increased by mulching with plant residues. 3. Inorganic-N content was lower in the soil mulched with plant residues at 2 weeks after mulching, and it became higher in the mulched soil than in the untreated soil at 10 weeks after mulching. Besides, the pH value, content of the Ca form of P_2O_5 (Ca-P_2O_5) and exchangeable cation contents were higher in the mulched soil than in the untreated soil. Especially, the remarkable effect of mulching was observed in the upper layer of the soil mulched with easily decomposable plant residues. Furthermore, there was a positive and significant correlation between the soil pH value and exchangeable cation contents. 4. These results indicated that the enhancement of soybean growth by mulching with plant residues was due to the increase of nodulation and nitrogen fixation at the early growth stage, and improvement of soil fertility at the later growth stage.
社団法人日本土壌肥料学会の論文

Mulching Effect of Plant Residues on Soybean Growth and Soil Chemical Properties

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