Ritchie discusses the management of plant growth regulators (PGRs), addressing four general questions: (1) Why did I have low micronaire in 2017? (2) Will I have high micronaire in 2018? (3) If I irrigate properly, do I need PGRs? and (4) Can I curb late-season growth with PGRs? In discussing PGRs, he defines and discusses types of cotton maturity (vegetative/reproductive and fiber maturity), how water deficit affects maturity, effects of planting date on maturity, and effects of gibberellins on crop growth.
