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Articles by N. Khan
Total Records ( 3 ) for N. Khan
  N. Mariun , D. Ismail , K. Anayet , N. Khan and M. Amran
  This study describes the details of high voltage DC power supply whose output voltage is 15 kV. In this study, we review the major aspects of the design of voltage multiplier circuits and constructed a prototype power supply based on simulation, design and implementation of the hardware works in the laboratory. Its simulation works done by using EMTDC PSCAD and PSPICE software. Experimental results are presented to verify the simulation results.
  M.H. Khan , G. Hassan , N. Khan and M.A. Khan
  Field study was conducted to investigate the effectiveness of different herbicides against broadleaf weeds. Different herbicides significantly effected weeds density m-2, number of broadleaf weeds m-2, number of tillers m-2, number of spikelets spike-1, number of grains spike-1, 1000-grains weight (g), biological yield (kg ha-1) and grain yield (kg ha-1). For controlling weeds, logran extra proved to be the best, giving 17.25 weeds m-2 as compared to 80.25 in weedy check plots. Similarly, maximum grain yield (3929 kg ha-1) was recorded in logran extra treated plots followed by plots receiving stomp and alkanak with grain yield of 3155 and 3111 kg ha-1, respectively. Minimum yield (1870 kg ha-1) was recorded in weedy check plots.
  N. Khan , G. Hassan , K.B. Marwat and M.A. Khan
  The effect of different herbicides applied at different timings viz. 30, 45 and 60 days after sowing (DAS) of wheat crop was studied for controlling weeds. Herbicidal treatments were Assert (Imazamethabenz-methyl) 0.30, isoproturon 1.12 kg alone and buctril-M (bromoxynil+MCPA) 0.72 kg+topik (clodinofop) 0.37 kg, logran (trisulfuron) 0.64 kg+topik (clodinofop) 0.37 kg, 2,4-D (2,4-D ester) 1.20 kg+topik (clodinofop) 0.37 kg and puma super (phenoxyprop-ethyle) 0.75 kg+2,4-D (2,4-D ester) 1.20 kg a.i. ha-1. A weedy check was also included for comparison. The analysis of the data revealed significant differences among the times of application for biological yield and grain yield. Similarly significant differences were recorded for herbicidal treatments in traits like spikelets spike-1, 1000 grains weight (g), biological yield (kg ha-1) and grain yield (kg ha-1). The interaction of the times of application and herbicides was significant for spikelets spike-1 and for grain yield. Maximum number of spikelets spike-1 and heavier 1000 grains weight was observed in plots treated with buctril-M+topik mixture, while minimum in weedy check plots. Biological and grain yield (kg ha-1) were higher in plots treated with buctril-M+topik and logran extra+topik while lower biological and grain yield were in weedy check plots. Buctril-M+topik proved to be the most economical herbicides giving maximum return of Rs. 24631 ha-1, if applied 45 DAS in wheat.
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