Agrochemicals firm UPL Ltd may buy back the stakes of Abu Dhabi Investment Authority and TPG Capital, which helped the Mumbai-based company acquire Arysta LifeScience Inc. for a record $4.2 billion, after the expiry of a three-year lock-in period. Sovereign wealth fund ADIA and leading global alternative asset firm TPG have partnered UPL Corp.’s acquisition of Arysta, which closed on …