Mepiquat Chloride

Stage-specific yield boost

Optimize photosynthetic efficiency and assimilate partitioning to increase soybean yield through cultivar- and stage-specific application of mepiquat chloride.

Zhao, Li · Li, Jiaqi · Xinyu, Zhou · Zhao, Wei · Dong, Shoukun

Plants 2026

Specifications

Grain weight per plant increase (HN65, seedling)

{'zh': '200', 'en': '200'} mg/L

Grain weight per plant increase (HN44, flowering)

{'zh': '50', 'en': '50'} mg/L

Total dry matter increase (HN65)

{'zh': '200', 'en': '200'} mg/L

Optimal combined application concentration range

{'zh': '200-400', 'en': '200-400'} mg/L

Advantages

Cultivar-specific regimen

HN44 yields more with 50 mg/L at flowering, while HN65 yields more with 200 mg/L at seedling, indicating optimal timing differs by cultivar and cannot be generalized.

Single application boosts yield

A single application at the right stage and concentration increases grain weight per plant, saving multiple spray costs.

Enhanced photosynthesis

Mepiquat chloride enhances net photosynthetic rate and PSII efficiency in a concentration-dependent manner, improving photoprotection and providing a physiological basis for yield increase.

Applications

• Soybean cultivation：Spray mepiquat chloride according to cultivar and stage to directly increase grain weight per plant.
• Crop chemical regulation：Use mepiquat chloride to regulate photosynthesis and assimilate partitioning for chemical control-based yield increase.