Effects of Soil Conditioners Mixed with MASA (Decomposed Granite Soil) on The Growth of <I>Hedera helix</I> ‘Pittsburgh’

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  • マサ土への土壌改良剤の混入がヘデラの生育に及ぼす効果
  • マサド エ ノ ドジョウ カイリョウザイ ノ コンニュウ ガ ヘデラ ノ セイ

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The experiment was carried out to clarify the effects of some soil conditioners mixed with MASA (decomposed granite soil) on the growth of Hedera helix ‘Pittsburgh’. The soil conditioners used in the experiment were as follows:(1) sawdust compost mixed with cow excrement, (2) bark compost, (3) peat moss, (4) perlite and (5) vermiculite. Three experimental plots were set up for each soil conditioner, and the proportions of soil conditioner to MASA in volume were 1:4 (20% plot), 2:3 (40% plot) and 3:2 (60% plot).<BR>The plants grew best in the 40% and 60% plots of sawdust compost, and next in the 60% plot of bark compost and 20% plot of sawdust compost. The values of growth indices such as vine length and top dry weight of the latter two were about half of the former two. In the other plots, the values were about a quarter of the former two or less, and no signigicant differences were found among them.<BR>The plant growth generally depended on the nitrogen content of soil. Sawdust compost and back compost contained almost the same amount of nitrogen; however, the plant growth of the latter was markedly inferior to the former. One of the reasons, we suppose, is the difference of the physical properties of soil, because sawdust conpost showed higher degree of aggregation than bark compost.

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