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Articles by M. Tahir
Total Records ( 7 ) for M. Tahir
  Nazir Hussain , R. A. Jakhar , M. Tahir , R. Noreen , N. M. Hassan and Fakhar Mujeeb
  A pot experiment was conducted to investigate the impact of different Ca/Mg ratios (1:1, 2:1, 3:1 1:2, 1:3 1:4 in addition to canal water as standard) on soil properties and maize and wheat yields. A normal soil was taken in lysimeters, these crops were grown in sequence and irrigated with synthetic water of variable Ca/Mg ratios consistently for three years. It was observed that fodder yield of maize and grain yield of wheat was significantly decreased when irrigation with higher Mg content compared to Ca was adopted. The impact was more pronounced with wider ratios and in the later two years. Harmful effect on soil properties was also noticed because EC, pH and SAR in these treatments was recorded to be on higher side. Thus, irrigation waters having comparatively more Mg than Ca proved deleterious not only for cops but also impaired the soil conditions.
  Nazir Hussain , G. D. Khan , M. Tahir , F. Mujeeb , M. Arshad Ullah and Afzal Ahmad
  Green house studies were conducted to assess the effect of different moisture and salinity regimes on germination; plant height and grain yield of wheat LU 26 S. Four moisture levels (M1 = 20, M2 = 40, M3 = 60 and M4 = 100% of saturation percentage) and four salinity levels (S1 = control, S2 = 10, S3 = 20 and S4 = 30dS m-1) were tested. Results indicated that germination, plant height and grain yield decreased progressively with increase in salinity. Total germination percentage increased up to 40% moisture content beyond which it registered a decrease. Maximum plant height and grain yield per plant was noted at 60% moisture combination with all the salinity levels were minimum values were obtained at 100% soil moisture except in case of control. Sodium and chloride concentration in the second leaf exhibited a progressive increasing trend with increase in salinity. Maximum concentrations of these ions were, however, recorded at 100% moisture level followed by 20% soil moisture, while at 40% and 60% soil moisture levels minimum accumulations were observed. Maximum k+ in leaves was determined at 60% moisture, which decreased with increase in salinity.
  Nazir Hussain , Fakhar Mujeeb , M. Tahir , G. D. Khan , N. M. Hassan and Abdul Bari
  This research work was conducted to evaluate the efficacy of Rhizobium trifolii in enhancing the salt tolerance of Trifolium alexandrinum (Berseem or Egyptian clover), protein value of fodder and nitrogen fixation in the soil. Three salinity levels (8,12, 16 dS m-1) were developed in a loamy soil in pots. A similar set of inoculated pots with Rhizobium trifolii was also arranged. Berseem crop was grown in both of the sets. The data indicated that total green and dry matter yield as well as root dry weight of berseem decreased consecutively with increase in salinity level while Rhizobium inoculation created a positive effect and these parameters remained significantly higher than the similar levels without inoculation. Nodulation and nodule dry weight was promoted markedly by inoculation and depressed significantly with consistent increase in salinity. Nitrogen percentage of berseem shoot increased with inoculation and decreased significantly at 8 dS m-1 but further increase in salinity had a little effect. Percent nitrogen of soil and nitrogen fixation in soil was enhanced significantly by inoculation and decreased significantly with increase in salinity. Inoculation was helpful to keep the protein content higher. Soil ECe and pH were lowered.
  Nazir Hussain , Arshad Ali , A.G. Khan , Obaid-Ur-Rehman and M. Tahir
  The water culture studies were conducted to investigate a physiological mechanism. Performance of this rice variety, ion concentration and uptake were studied under stress of three salinity levels (30, 60 and 90 mM1-1) created by NaCI. The results indicated that shoot dry matter was not affected significantly with all the three levels of salinity. However the root dry matter was affected appreciably by the levels of 60 and 90 mM NaCI. Sodium concentration and uptake was enhanced significantly by root and shoot with the first level of salinity (30 mM) but thereafter the differences were non-significant indicating the preferential absorption of this cation. The K concentration was decreased significantly in shoots with all the levels. The impact was less pronounced in roots as far as K absorption was concerned. There was no effect on Ca and Mg. The values of K: Na, Ca: Na and Ca+Mg: Na ratios in shoot and root were comparatively narrow under stress conditions which indicated that Shaheen Basmati variety used ion selectivity mechanism in showing its tolerance when grown in saline medium.
  Nazir Hussain , M. Anwar Zaka , M. Tahir , M. Arshad Ullah and Zahid Saeed
  Three barley varieties (Jao–83, Jao–85 and As–54) were tested in solution culture for three salinity levels (S1= 0–40me l-1, S2=160-200me l-1, S3=360-400me l-1) and four Ca concentrations (0, 10, 20, 40me l-1). Maximum number of leaves per hill was recorded at low calcium concentration under normal salinity conditions but at higher salinity levels this parameter increased with increasing CaCl2 levels. Barley variety Jao-83 produced more tillers per hill than Jao-85 and As-54. All the varieties yielded maximum shoots dry weights at less CaCl2 concentration and lower salinity level. However, CaCl2 concentration of 40me l-1 proved helpful to mitigate the ill effect of higher salinity level. Similar results were noted in case of length and dry weight of roots. The variety Jao-83 gave maximum root dry weight as well.
  Nazir Hussain , Zahid Saeed , M. Tahir , Abdul Bari , N. M. Hassan and Afzal Ahmad
  A solution culture experiment was carried out to study the effect of calcium on the concentration of Na+, K+, Ca+2 and Cl‾1 ions in barley under saline conditions. Barley varieties Jao-83, Jao-85 and AS-54 were germinated. Three levels of salinity; control (0-40 me l‾1 = S1), 200 me l‾1 (S2) and 400 me l‾1 (S3) were created by using NaCl. In addition, CaCl2 was also added at the rate of 0, 10, 20 and 40 me l‾1 to all the salinity levels replacing equivalent amounts of NaCl. Seedlings were uprooted after 45 days of salination; root and shoots were cut separately and analyzed. Increase in each level of external salinity caused an increase in sodium and chloride concentration in barley shoot and root, while the concentration of potassium and calcium decreased with progressive increase in the substrate salinity. Addition of calcium at all salinity levels decreased sodium concentration but increased chloride, potassium and calcium concentration both in root and shoot. The variety Jao-83 contained lesser concentration of sodium and chloride and more of calcium and potassium as compared to Jao-85 and AS-54.
  K. Iqbal , A. Tanveer , A. Ali , M. Ayub and M. Tahir
  Study to determine the effect of different levels of N and P on the fodder yield and quality of rice bean comprised NP combinations of 0-0 (control), 25-25, 25-50, 25-75, 50-25, 50-50 and 50-75 kg ha–1. Plant height, number of branches, leaves and leaf area increased significantly by the application of N and P over control. Maximum green fodder yields of 50.35, 51.61 and 53.03 t ha–1 were obtained in plots fertilized at 50-25, 50-50 and 50-75 kg ha–1, NP respectively. Crude protein, crude fibre and ash contents of the rice bean were increased by increasing rates of N and P.
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