Laboratory analysis demonstrates reduced rice growth due to Italian ryegrass fermentation extracts, highlighting potential agricultural implications.
The rice rotation in China and Korea encourages growth of Italian ryegrass (IRG) under moist conditions in rice fields. IRG in paddy fields is sown in end September/early October and harvested in May and its residues are ploughed in the field before the rice transplanting in June. The fermentation extract of IRG drastically inhibited the shoot and root length of rice cultivars, Ilmibyeo and Dongjinbyeo degree than boiling water extract and ethanol extracts. The fermentation extracts inhibited the shoot and root length of both cultivars during the seedling and development stages than in the harvest period. The inhibition of shoot and root length of rice by shoot and root extracts of various IRG cultivars was similar in all tested cultivars. The IRG shoot and root incorporations in direct seedling reduced the plant height and shoot fresh weight of rice cultivars than in transplanting cultivation. Caffeic acid (except in IRG root), p-coumaric acid, ferulic acid, and hydrocinnamic acid were detected in the water fraction of fermentation extract of IRG shoots and roots. Overall, the phenolic compounds of IRG reduced the rice growth.
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Jang et al. (2018) studied this question.
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