土壌ポット試験によるホウレンソウの成育に対する生分解性プラスチックの影響

概要

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Recently, biodegradable plastics are being increasingly used in various applications. In agriculture, biodegradable plastics have been used as materials for plastic film in mulching treatment and plant pot. However, the effect of biodegradable plastics in soil on plant growth is yet to be clarified.Two experiments were carried out to investigate the effect of the degradable properties and concentration of biodegradable plastics in soil on plant growth and components of spinach. In experiment 1, 0.05%~1% of a low degradable plastic (polylactide, L) or a high degradable plastic (caprolactam-polyester copolymer, C) was applied to the soil; the fresh weight; leaf number; shoot/root (S/R) ratio; and ascorbic acid, nitrate, and total or water-soluble oxalic acid contents of plants grown in treated soil were almost equal to those of the control. A 10% L application did not result in the reduction of plant growth, whereas a 10% C application reduced plant growth. In experiment 2, no differences were observed in the growth and contents of nitrate and total or water-soluble oxalic acid of plants grown in soil treated with 1% C, L, and B (polybutylene succinate adipate copolymer, B (a high biodegradable plastic)) each. A 10% B application reduced plant growth. Our findings suggested that a low-level (0.05%~1%) application of biodegradable plastics in soil might not be toxic for plant growth in agriculture.
2007-03-31