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奥普尔是一种高浓缩的有机腐殖酸液肥，在杂交桑上应用，效果显著。试验证明，使用浓度为400倍液，喷施叶片2～3次，其叶片浓绿，桑叶产量高，品质好。测定桑叶营养成分、1～4龄眠要体重及全茧量等项指标，均比对照有明显提高。
Opal is a highly concentrated organic humic acid liquid fertilizer, applied in hybrid mulberry, the effect is remarkable. Test proved that the use of 400 times the concentration of liquid sprayed leaves 2 to 3 times, the leaves dark green, mulberry yield, good quality. Determination of nutrients in mulberry leaves, 1 to 4 age sleep weight and cocoon amount of other indicators were significantly higher than the control.