THE EFFECT OF FOURTEEN ROOT EXTRACTS UPON GERMINATION AND SEEDLING LENGTH OF FIFTEEN PLANT SPECIES

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Abstract
Root extract solutions of crested wheatgrass, Russian wild ryegrass, intermediate wheatgrass, couch grass, bromegrass, Altai wild ryegrass, wild barley, poverty weed, alfalfa, sweet clover, reed canary grass, timothy, sorghum grass, and dandelion on quartz sand were used as germinating and growing media for seeds of 12 of these species as well as for wheat, oats, and barley.Root extracts from Russian wild ryegrass, crested wheatgrass, intermediate wheatgrass, brome, timothy, reed canary, and wild barley had little or no effect on the germination of the seed of most species. Those from Russian wild ryegrass and brome had little effect on seedling length. On the other hand, extracts made from the roots of alfalfa, dandelion, sorghum grass, sweet clover, poverty weed, and couch grass showed the greatest inhibitory effects on both the germination and seedling growth.