1987 Fiscal Year Final Research Report Summary
Studies on the interactions between crops and weeds, with reference to allelopathic substances
| Project/Area Number |
61560017
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
作物
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| Research Institution | Faculty of Agricultur, Miyazaki University |
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Principal Investigator |
EIJI Tsuzuki Faculty of Agriculture, Miyazaki University, Assistant Professor, 農学部, 助教授 (30041049)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Allelopathy / Interactions among plants / Inhibitors / Competition between crops and weeds / 連作障害 |
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| Research Abstract |
To obtain the informations on the cultivations of upland crops, the present studies were set up to clear the interactions between crops and weeds. Eight crops and 6 weeds were used as materials. The results obtained are summarized a follows.
(1) Aqueous extracts from crops and weeds inhibited the growth in rice seedlings. The extent of inhibition was remarkably great in the extracts from wheat, oat white clover, Spergula arvensis, Hydrocotyle sibthorpioides, and Houttuynia cordata. The extracts from oat, soybean, lupine and alfalfa also retarded germinatio fo Brassica napus.
(2) The residues of crops and weeds burried in soils inhibited the growth of radish and the degree of inhibition was great in oat, barley, Galium aparine and Artemisia vulgaris. Root exudates from alfalfa reduced growth and dry weight of radish.
(3) Methanol extracts from soils cultivated oat and alfalfa retarded germination of radish. The extracts from oat soils inhibited the growth of hypocotyl in radish and the methanol extracts form alfalfa soils inhibited the elongation of rice seedlings. Agueous and methanol extracts form oat and alfalfa inhibited remarkably growth of rice seedlings. The results suggest that two crops, oat and alfalfa have actions of allelopathy against crops and weeds.
(4) Allelopathic substances of methanol extracts from oat, alfalfa, Spergula arvensis and Hydrocotyle sibthorpioides were examined by means of physico-chemical procedures.
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