By Elroy L. Rice
8vo, , PP.439,
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Extra resources for Biological Control of Weeds and Plant Diseases: Advances in Applied Allelopathy
The aqueous extracts from roots of Palmer amaranth did increase 72-hour germination percentages in carrots and tomatoes. A time study of residue decomposition demonstrated that there was an increase in extractable inhibitors of onion germination after 62 days, but no other significant changes occurred. The most active allelo-chemicals from Palmer amaranth proved to be volatile compounds. Volatiles from soil containing residues and from partially rehydrated leaf and flower residues reduced carrot and tomato seed germination to less than 7%; onion seeds were also inhibited by volatiles from Palmer amaranth residues.
Biswas and Chakraborti (1984) found that water extracts of leaves of Borreria articularis (Spermacoce hispida) inhibited either the root or hypocotyl growth, or both, of jute (Corchorus olitorius), lettuce, mustard, rice, and wheat and five weed species. Bothriochloa pertusa is a weed of cultivated fields on relatively mesic habitats in Pakistan, it replaces or reduces growth of associated species within the habitat. This weed significantly reduced growth of tomato, lettuce, corn, German millet (Setaria italica), and Capsicum annuum in root-mixed cultures by releasing water-soluble chemicals from the roots in the field.
None of the similar 5-HTP concentrations affected root or shoot growth of red kidney beans. Bhowmik and Doll (1983) reported that redroot pigweed (Amaranthus retroflexus) reduced corn height, leaf area, and dry weights at all growth stages. Yellow foxtail residue reduced total dry weights of corn 10, 20, and 30 days after planting (DAP) but inhibited corn height and leaf area only at 30 DAP. Larger shoot-root weight ratios occurred with the pigweed residue, indicating a greater inhibitory effect on root growth.