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Articles by T. Mahmood
Total Records ( 6 ) for T. Mahmood
  Syed Ijaz Hussain , T. Mahmood , K. M. Khokhar , M. H. Laghari and M. H. Bhatti
  Eleven advanced lines/cultivars of pea were tested for yield and resistance against powdery mildew under natural conditions of infection. All the lines were found to be resistant while the local cultivars (Climax and PF-400) proved highly susceptible. Significant differences were observed between the yield of local cultivars and those of the advanced lines. Advanced lines out yielded local cultivars. However, the lines 91-1, 91-3 and 91-2 were outstanding with yields of 22.9, 21.6 and 19.6 tones ha-1 respectively.
  Khalid Mahmood Khokhar , Hidayatullah , T. Mahmood , S. I. Hussain , M. H. Bhatti and M. H. Laghari
  The effects of seedling/set size and planting times on bulb yield and quality in onion cultivar Phulkara were studied during autumn season 2000. The bulbs of seedlings and sets were graded in three sizes of 2.5, 3.5 and 4.5 mm diameter and 7.5, 12.5 and 17.5 mm diameter, respectively and were sown on 15th August and Ist September, 2000. Highest mean marketable bulb yield (21.2 tha-1) was obtained using 17.5 mm diameter size sets and seedling with 4.5 mm diameter bulbs. However, the crop sown with 17.5 mm diameter sets on 1st September, produced significantly highest marketable bulb yield of 24.6 tha-1 and also gave highest percentage of doubles (17.9 %). Sets with 17.5 mm diameter though produced highest percentage of doubles but also gave highest marketable bulb yield and are therefore recommended for planting autumn season crop in first week of September.
  Z. Ahmad , F. Azam , T. Mahmood , M. Arshad and S. Nadeem
  A pot experiment was conducted in the greenhouse to evaluate the effect of calcium carbide (as a source of ethylene) on some agronomic parameters of wheat (Triticum aestivum L., var. Inqalab-91) that was grown without or with two levels of N, P and K fertilizers (120-90-60 kg ha-1 and 60-45-30 kg ha-1). Half dose of N and full dose of P and K was applied at sowing while remaining half after one week of germination. Calcium carbide as a source of ethylene was applied at 60 kg ha-1 after 2 and 8 weeks of germination. A factorial completely randomized design was followed with nine treatments each with three replicates. Data regarding plant height, number of tillers, length of spike, number of spikelets spike-1 and grain yield was recorded. Plant height, number of tillers and spike length were significantly affected when CaC2 was applied after one week of germination while number of spikelets and grain yield was maximum when CaC2 was applied after 8 weeks of germination.
  M. A. Shad , T. M. Ansari , H. Pervez , M. Rubab and T. Mahmood
  Quick decline disease causes collapse of healthy mango plants within a few days. The menace has been observed in the entire mango growing areas of Pakistan. The leaf samples of healthy and diseased mango plants of two major varieties viz. chaunsa and langra were analyzed to asses the variations in the contents of sugars, free amino acids and metals in relation to quick decline. In general, the contents of total sugars, reducing sugars, non-reducing sugars, free amino acids and minerals were found to be decreased in the diseased leaves as compared to that of healthy leaves of both the mango varieties. Quantitative analysis of macro and micro-nutrients was carried out by atomic absorption and flame emission spectrometry to find the status of these elements in healthy and diseased leaves. Mg contents were found to be decreased in the diseased leaves of both the mango varieties whereas Cu and Zn contents were found to be increased. No consistent trend was observed in case of other metals.
  T. Mahmood , A.S. Bhatti and K.A. Malik
  Study was conducted to follow seasonal changes in the denitrification potential (DNP) of an irrigated sandy-clay loam under a wheat-maize cropping system receiving different fertilizer treatments for the past ten years. Fertilizer treatments included: N-100 (urea at 100 kg N ha -1 a -1), N-200 (urea at 200 kg N ha -1 a -1), FYM-16 (farmyard manure at 16 t ha -1 a -1), FYM-32 (farmyard manure at 32 t ha-1 a -1) and the control (unfertilized). Urea-N was applied in four equal splits, two to each crop, whereas all farmyard manure was applied at the time of sowing wheat. Averaged across treatments during the growing period of wheat, DNP increased with crop growth, reached maximum at flowering, and declined at grain formation. Under maize, however, the DNP increased till flowering and remained unchanged at dough stage when the fodder was harvested. Average DNP during the wheat season was almost 1.6 times higher than that under maize. Averaged across sampling dates during the wheat season, N-200 showed 13 per cent higher DNP than the control, whereas N-100 had no effect. Under maize, DNP was 37 per cent higher with N-100 treatment than the control while N-200 had no effect. During the wheat season, DNP showed an increase of 66 and 114 per cent due to FYM-16 and FYM-32 treatments, respectively. However, the residual effect of FYM on DNP during the maize growing season was observed only with FYM-32 treatment which showed 34 per cent higher values relative to control. Denitrification potential was significantly correlated with aerobically mineralizable carbon and microbial biomass carrying capacity but not with microbial biomass carbon, total organic carbon and actual denitrification rates in the field.
  M. Q. L. Bhatti , Z. A. Cheema and T. Mahmood
  Sorgaab (water extract of mature Sorghum bicolor plants) was evaluated for its effect on weeds in Raya crop and it was compared with commonly employed weed control practices i.e hand weeding and a herbicide-pendimethalin in a field trial during 1998. Results revealed that Spraying of sorgaab at 15, 30 and 45 Days After Sowing (DAS) reduced dry weight of all weeds by 45-85% while herbicidal treatment reduced dry weight by 45%. The yield of Raya crop was significantly enhanced (33-58 96) with sorgaab over control. Hand weedings (one and two) at 15+30 DAS increased Raya seed yield by 40-72% while herbicidal treatment improved the seed yield by 26% and was uneconomical due to higher cost as compared with one, two and three sprays of sorgaab.
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