M. Ashfaq, M. S. Shaukat, M. Akhter, M. S. Haider, U. Mubashar and S. B. Hussain
1Institute of Agricultural Sciences, University of Punjab, Lahore, Pakistan; 2Rice Research Institute (RRI), Kala Shah Kaku, Lahore, Pakistan; 3College of Agriculture, BZU, Multan, Pakistan; 4Government Elementary Teachers Education College Ghakkhar Mandi, Gujranwala, Pakistan