Sowing dates and plant spacing affect cotton growth and yield. Early sowing and high plant density lead to better yield and reproductive growth. Early sowing increases crop growth rate and relative growth rate. Number of bolls per plant and reproductive/vegetative ratio are key factors for high seed cotton yield. Boll weight has a negative impact on yield. Reproductive/vegetative ratio has the most direct effect on yield with early sowing. Boll number affects yield indirectly through reproductive/vegetative ratio. Reproductive dry matter has a direct impact on yield with high plant density.