The PCCC, Cotton Research Station, Dera Ismail Khan, Pakistan;
The PCCC, Central Cotton Research Institute, Multan, Pakistan;
Agricultural Research Institute, Ratta Kulachi, Dera Ismail Khan, Pakistan;
Global Change Impact Study Centre Islamabad, Islamabad, Pakistan;
G.; hirsutum; Planting; Time; Cumulative; Heat; Units; Cotton; Cultivars;