The synergistic effects of 2-ethyl-3-methoxycarbonyl-l-(p-tolylcarbamoyl)-isourea and 4-ethoxy-l-(p-tolyl)-s-triazine 2,6(1H,3H)-dione on GA1,3,4,7,8,9,17,19,20 ana 53 in rice seedlings were investigated. Each synergist showed a very high effect when combined with GA1,3,9 or 17, a high effect with GA4,7,19 or 20, little effect with GA53, and no effect with GA8.
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Satoh et al. (1981) studied this question.