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水稻喷施８９１植物促长素有明显增产效果。溪二－２８喷施３００～５００倍８９１促长素后，比对照区产量增加５．２７％～７．８６％。增产因素主要是单株有效穗、实粒数增加明显；结实率、千粒重也呈增加趋势。在水稻分蘖、加穗期喷施，浓度以３００倍液为最好。与其它植物生长剂比较，各有差异。
Spraying 891 plant auxin has a significant yield increase effect. After sprayed with 300-500 times of 891 ghrelin for brook two-28, the yield increased by 5.27% ~ 7.86% compared with the control. The main factors of yield increase were effective spikes per plant, and the number of real grains increased obviously. Seed setting rate and 1000-grain weight also showed an increasing trend. Spraying rice, add spike spraying, the concentration of 300 times the best solution. Compared with other plant growth agents, each has its own difference.