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Articles by Nazir Ahmad
Total Records ( 5 ) for Nazir Ahmad
  Nazir Ahmad , S.M. Masoom Shah Rashdi and Akbar Ali Rajput
  The changes incurred in the plant growth by the application of growth regulators may conversantly affect the insect plant interaction. Therefore, experiments were conducted to evaluate the effect of different plant growth regulators; Atonic, Cytokin, Cytoplex and Pix for the management of sucking complex and bollworms in cotton crop. Maximum seed cotton yield and minimum infestation of pink and spotted bollworms were recorded in Pix and Cytokin treated cotton. Both of the regulators enhanced the boll size and boll retention power of the plant and maximum number of bolls and larger boll size were recorded from the plots treated with Pix or Cytokin. Bioregulators, Pix and Cytokin were also more effective to check the infestation of jassids, thrips and white flies as compared to Atonic and Cytoplex treatments. Atonic and Cytoplex did not prove effective against cotton bollworms and for the enhancement of seed cotton yield.
  Nazir Ahmad , Bilquis Fatima , Gul Zamin Khan , Nasrullah and Abdul Salam
  Management of insect pests of cotton depends on the application of chemical insecticides in Pakistan. Use of chemical insecticides induce resistance in insects and destroy the natural pest control agents. Therefore, alternatives to insecticides are receiving much attention. Studies to manage the insect pest through augmentative releases of egg parasitoid, Trichogramma chilonis and predator, Chrysoperla carnea, indicated that biocontrol technology suppressed the infestation of insect pests of cotton to sub-economic levels. Low establishment of egg parasitoids was recorded in the early crop growing months and gradually increased to peak during the month of October. Whereas, maximum field establishment of C. carnea was recorded in the month of August.
  Nazir Ahmad , Muhammad Abid , Khadim Hussain , Muhammad Akram and Muhammad Yousaf
  The study was carried out to assess the macro and micro nutrients status and their relation with pH, organic matter, clay contents and calcium carbonate (CaCO3) in the rice growing areas (Kallar track). Soil samples from 0-15 cm depth were collected from 45-50 sites located in this area. The soil samples were processed and analyzed for macro and micronutrients. Results indicated that 40% soil samples were deficient in total N, 17.77% P, 4.41% SO4, 60% Zn, 4.5% Cu and 13.33% Mn. The K, Ca+Mg, Fe and B were not deficient. About 15.15% were low in total N, 33.33 in P, 6.66% in SO42 -S and 22.22% in Zn and no one in K, Ca+Mg, Cu, Fe, Mn and B. Soil pH, organic matter, clay and CaCO3 contents were correlated with macro and DTPA (diethyletriaminepenta-acetic acid) extractable available micronutrients. Organic matter showed positive correlation with N (0.969**), whereas pHs correlated negative with Mn (-0.316*). Clay contents showed significant positive correlation with K (0.325*), Cu (0.372*) and B (0.269*). Similarly, significant positive correlation of CaCO3 was recorded with Cu (0.415*) and Mn (0.360*).
  Yousaf Ali , M. A. Haq , G. R. Tahir and Nazir Ahmad
  Ten chickpea genotypes were evaluated for various morphological traits and yield under drought and normal field conditions. Genotype CM 2 produced more pods per plant, more elliptic index of leaf and more grain yield per plant under both conditions. Multiple correlation and regression analysis revealed that under normal conditions over all 92 percent variability in yield was accounted for by the plant height, secondary branches, pods per plant and elliptic index of leaf. While under drought conditions 96 percent variability in yield was accounted for by plant height, primary and secondary branches and pods per plant. Yield had high dependence upon plant height, secondary branches and pods per plant both under drought and normal field conditions.
  Ahrar KHAN , Imtiaz ALI1 , Iftikhar HUSSAIN and Nazir AHMAD
  During an enterotoxaemia outbreak, 9 out of 11 (82%) Chinkara deer (Gazella bennettii) died; 5 animals died of peracute disease, whereas acute death was observed in 4 animals. The case fatality rate was 100%. Clinical signs, including high temperature, depression, anorexia, abdominal pain, greenish watery diarrhoea, and respiratory distress, were recorded in the affected deer. Post-mortem examinations of the affected animals revealed muscular and serosal haemorrhages, hydroperitoneum, hydrothorax, and hydropericardium. Severe haemorrhages were also observed in the small intestine, colon, and kidneys. Histopathologically, haemorrhagic enterocolitis, pulmonary oedema, accumulation of proteinaceous fluid in alveoli, perivascular oedema, and interstitial and intertubular haemorrhages were seen in the kidneys. Anaerobic incubation, mouse inoculation, and mouse seroneutralisation with intestinal contents collected from the affected deer confirmed the Chinkara deer were infected with Clostridium perfringens type D.
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