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橡胶中龄无性系RRIM600对不同刺激强度(乙烯利浓度0～15％)的系列试验结果表明,施用低浓度乙烯利0.05％(每株次约1.5克糊剂)即有增产效应,可见该品系的刺激阀值可能低于0.05％,浓度自1％至5％,产量效应随浓度增大而显著或极显著地增大,浓度超过5％,产量效应随浓度增大而增加的趋势不明显,浓度超过10％,产量效应开始呈下降趋势。据此,初步认为,浓度自0.05％起,已属于有效刺激浓度;0.05～0.5％属于低效安全刺激范围,在此范围内,胶树的生理效应与对照差别不明显;1～5％属于高效刺激范围,在此范围,胶树的生理效应虽发生剧烈的变化,负作用开始明显增大,但基本上仍表现为正效应;5～10％仍属于高效刺激范围,但在此范围,负作用表现突出,胶树的生理效应已趋于负效应,浓度超过10％属于有害刺激浓度,在此浓度以上刺激,负作用表现极显著,胶树的生理效应表现为负效应,处于不可逆的生理胁迫状态。
The results of a series of experiments on RRIM600 with different stimulus intensity (ethephon concentration 0-15%) showed that the low yield of ethephon 0.05% (about 1.5g paste per plant) The stimulation threshold may be less than 0.05% and the concentration is from 1% to 5%. The yield effect increases significantly or very significantly with increasing concentration. When the concentration exceeds 5%, the yield effect tends to increase with increasing concentration , The concentration of more than 10%, the yield effect began to decline. Based on this, it is preliminarily believed that the concentrations of 0.05% to 0.5% belong to the range of effective stimulus from 0.05%, and within this range, the physiological effects of the gum tree are not significantly different from the control; 1% to 5% In this range, although the physiological effect of Gum tree changed drastically, the negative effect started to increase obviously, but it still showed a positive effect basically; 5 ~ 10% still belonged to the effective stimulation range, but in this range, Negative effects were outstanding. The physiological effects of Gum tree tended to be negative. Concentrations of more than 10% were harmful to the concentration. Above this concentration, the negative effects were extremely significant. The physiological effects of Gum tree showed negative effects and were irreversible Physiological stress status.