熟畑化過程における雑草植生の変遷に関する研究 : 第9報 土壌改良剤(ソイラック)の施用が雑草の植生に及ぼす影響
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概要
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Change in plant vegetation caused by the application of soilac on the newly cultivated field of fairly old volcanic ash soil was investigated. 1. Weed species that grew in the first year after the application of soilac were those of wild type. After 2 to 6 years, weeds of wild and farm types grew together. The major weed species observd were almost the same in each year in all the test plots and no significant differences were observed in weed vegetation. 2. In each year tested, no significant differences in weed population and total weight of weeds were observed in three test plots to which soilac was applied at the rate of 0, 50, and 100kg per 10a, respectively. However, weed population and total weight increased considerably at the plots of application of 200 and 400kg per 10a. 3. Anual change of the chemical properties of soil were almost the same in all the test plots. However, soil hardness were decreased and degree of aggregation were increased by the application of 200 or 400kg of soilac per 10a. 4. The threshold values at which increase of weed population and total weight occurrd were depression of 1.86〜2.23kg/cm^2 in soil hardness and increase of 3.18〜 5.54 percent for intact soil and 2.49〜5.75 percent for air dried soil in content of soil particles over 0.5mm. 5. Effect of soilac to soil appeared to be maintained for about three years by the application of 200kg per lOa, and for five years by the application of 400kg per 10a, when soilac was applied evenly in the soil to the depth of 28cm.
- 日本雑草学会の論文
- 1979-10-25