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Articles by Naeem Khan
Total Records ( 6 ) for Naeem Khan
  Muhammad Azim Khan , Khan Bahadar Marwat , Naeem Khan and Ijaz Ahmad Khan
  The research work was conducted to investigate the effectiveness of various weed control measures in maize hybrid P–3203. The treatments were pre-emergence application of dual gold (S-metolachlor) at 1.92, primextra (atrazine + metolachlor) at 2.25, treflan (trifluralin) at 1.5, stomp (pendimethalin) at 0.75 and jinong (atrazine) at 0.90 kg a.i. ha-1 and post-emergence application of 2,4-D at 0.80 and banvel (dicamba) at 0.84 kg a.i. ha-1. The treatments increased plant height (cm), cob length (cm), biological yield (t ha-1), leaf area (cm2), number of leaves plant-1, number of kernels cob-1, 500 kernel weight (g) and grain yield (t ha-1) significantly (P≤ 0.05), while broadleaf weeds, number of cobs plant-1 and harvest index were not significantly affected by different treatments. For controlling weeds, dual gold suppressed 88, primextra 82, stomp 45, treflan 48, Jinong 38, 2,4-D 23 and banvel 5% as compared to 248.7 number of weeds m-2 in weedy check. The dominant weed species found were Leptochloa sp., Echinochloa crus-galli, Cyperus sp. and Digiteria sanguinalis. Hand weeded and dual gold treated plots produced significantly taller plants, more kernels per cob (548.7 and 544.7) and the highest 500 kernel weight (121.33 and 119 g), respectively. Hand weeded, dual gold and primextra treated plots increased grain yield by 22.7, 21 and 15.3%. Application of dual gold proved to be the best and most economical weed control, giving maximum returns of Rs. 42030 ha-1. Primextra emerged as the next best alternative for weed management in maize.
  Naeem Khan , Khalid Naveed and Ikramullah Khan
  The effect of different weed control measures was studied in wheat crop. The experiment was laid out in simple RCB design, replicated four times. It was comprised of seven treatments i.e. Irelon 50 SC @ 1.12, Puma S 75 EW @ 0.85, Buctril M 40 EC @ 0.72, Buctril M +Topik 15 WP @ 0.72 and 0.75, 2,4-D (powder) @ 1.20 kg a.i ha-1, Hand weeding after 35 days of sowing and a weedy check was kept for the comparisons. Data recorded were weeds count m-2, plant height (cm), grains spike-1,1000 grains weight (g), biological yield (kg ha-1) and grain yield (kg ha-1).The lowest (16.10) weeds m-2 was count in Puma S treated plots as compared to the highest (69.72) recorded in the weedy check plots. Buctril M and 2,4-D were comparable with Puma S. Buctril M + Topik mixture increased grains spik-1and 1000 grains weight significantly in wheat. Significant increase was also occurred in biological and grain yield (kg ha-1) with the application of Buctril M + Topik application. It gave maximum of 9236.35 and 2986.43 kg ha-1 biological and grain yields, respectively. Puma S, 2,4-D, Irelon and hand weeding also increased biological and grain yields significantly.
  Naeem Khan , Amanullah Jan , Ijaz Ahmad Khan , Muhammad Azim Khan and Ihsanullah
  An experiment was conducted at Agronomy Farm, NWFP Agricultural University, Peshawar during 1998-99 to study the response of wheat cultivars to varying seeding rates under rainfed conditions. The cultivars sown were Khattakwal, Suleman-96 and Tatara-96. Seed rates were 40, 80, 120 and 160 kg ha -1. The results revealed that the wheat planted at the rate of 160 kg ha -1 significantly produced highest grain yield 2733 kg ha -1 as compared to lower seeding rate. Similarly highest biological yield of 8466 kg ha -1 was recorded for highest seed rate (160 kg ha -1), and the lowest biomass yield of 5807 kg ha -1 for the lowest seed rate of 40 kg ha -1. Highest number of 215 spikes m -2 was for the highest seed rates and lowest of 113 spikes m -2 were for the lowest seed rate. Among the cultivars, Suleman-96 gave the highest grain yield (2708 kg ha -1) whereas Tatara-96 and Khattakwal produced 2500 and 1233 kg ha -1, respectively. Suleman-96 produced more number of grains/spike than Tatara-96 and Khattakwal. In addition, the 1000 grain weight of Suleman-96 was slightly more than Tatara-96 and Khattakwal i.e., 43, 42 and 31g respectively. Number of spikes m -2 were equal in case of Khattakwal and Tatara-96, whereas slightly less in Suleman-96 i.e., 163, 160 and 164 respectively. Khattakwal was highly susceptible to lodging as compared to Suleman-96 and Tatara-96. However, Suleman-96 had a higher number of loose smut attacks and the seeds should be treated with fungicides before sowing.
  Naeem Khan , Gul Hassan , Muhammad Azim Khan and Ikramullah Khan
  A field experiment was conducted during 2000-01, to investigate the effectiveness of different herbicides for controlling weeds in wheat. Significant differences were observed among the times of application for weed density after herbicidal treatments and number of tillers plant-1. Similarly significant differences were recorded for herbicidal treatments in the traits like weed density after herbicidal application and number of tillers plant-1. The interactions of times of application and herbicides were significant for weeds density after herbicidal application and number of tillers plant-1. The 45 DAS herbicidal application time was best for tillers plant-1. As a whole the herbicidal application at 45 DAS provided excellent weed control. Weeds were most effectively controlled by buctril-M + topik, isoproturon alone and logran + topik. None of the herbicides except isoproturon 75 WP at 30 DAS application had a phytotoxic effect on the wheat crop. Highest number of tillers plant-1, were produced by buctril-M + topik and logran + topik as compared to weedy check.
  Naeem Khan , K.R.V. Manikantachari , Rahul Dutta Roy and V. Raghavan
  This study presents the experimental investigation of flame length, lift-off velocity and lift-off heights of jet diffusion flames fuelled by a mixture of Liquefied Petroleum Gas (LPG) and hydrogen. LPG is commonly used domestic, automotive and industrial fuel that is around two times heavier than air. When hydrogen is added to LPG, significant flame control and lift-off stability is achieved. Results show that, with the addition of hydrogen, the flame length is decreased and lift-off occurs at higher fuel flow rate; the lift-off height also decreases. Increased heating value, increased diffusivity and increased reactivity are the reasons for increased stability.
  Atta Ullah , Abdul Basit , Muhammad Aslam and Naeem Khan
  Power quality and the dynamic performance of the distribution system in Pakistan is poor because of weak and out-of-date system. It is unable to deliver the required reactive power in case of various system disturbances. Distribution Static compensator (DSTATCOM) is an important compensator which is able to enhance the power quality and dynamic performance of the distribution system. In order to improve power quality and dynamics performance of the distribution system effectively a more robust and optimal control algorithm is required for D-STATCOM. Hence, in this research work an improved and optimal control algorithm have been designed for D-STATCOM. In improved control scheme SRF theory control is used for the reference current generation. For the generation of gat pulses for VSC of D-STATCOM level shifted PWM scheme have been used because it offers very good performance for reduction of harmonics distortion. The designed device is implemented in MATLAB-Simulink and is capable to deliver good reactive power compensation under various loading environments such as inductive load, capacitive load and under abnormal faults conditions.
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