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Articles by Zaheer Ahmad
Total Records ( 2 ) for Zaheer Ahmad
  Zaheer Ahmad , Muhammad Aslam , Maqsood Ahmad Gill , Muhammad Yaseen and Hamud-ur-Rehman
  Soils of Pakistan are frequently characterized as deficient in plant-available phosphorus (P). The option of fertilizer applications to cope the situation has proved cost-intensive for resource-poor farmers of the country. Under the circumstances, exploitation of genetic variations in crops for P-use efficiency and identification of P-efficient crop cultivars hold great promise. Experiments conducted at the University of Agriculture, Faisalabad indicated significant growth differences among varieties of wheat, rice, chickpea and cotton when grown under P-deficient as well as P-adequate conditions. Differences in relative adaptability of varieties to P-deficiency stress were also considerable. In this paper, work done in Pakistan and elsewhere on genotypic variations of P-nutrition of crops is briefly reviewed. Various physiological mechanisms responsible for such variations are also discussed.
  M.Y. Mujahid , N.S.Kisana , Zaheer Ahmad , Iftikhar Ahmad , S.Z.Mustafa and A.Majid
  Wheat is the staple food of the people of Pakistan grown on an area of about 8.4 million hectares annually (MINFAL 97-98). The wheat production is affected due to the varying degree of different biotic and abiotic stresses in the country. The success of a breeding programme aims at the development of high yielding wheat varieties which are developed by making recombinants for the traits of economic importance. Forty bread-wheat cross combinations were attempted during the year 1997-98 to determine the heterotic and heterobeltotic effects of the recombinants in Fl generation. The parental material also included local types from highland and dryland areas to utilize the useful diversity in the breeding programme. Maximum degree of heterosis (increase over mid parents) was manifested by the cross number 21 (C-273/WCB BO) for all the trails studied. The same cross-showed the maximum haterobeltosis (increase over better parents) for plant height, spike length, # of spikelets per spike and grain weight. Another cross (Local white/sannine) also showed the same effects for all the trials. There was a varying degree of heterosis in different crosses showing that different combinations can be exploited for the manifestation of heterosis and suggest the choice of selection of desirable parents for the development of better recombinants.
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