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Articles by G. Hassan
Total Records ( 5 ) for G. Hassan
  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.
  N. Persaud , G. Hassan , W.D. Joshua and D. Lesolle
  The purpose of this study was to use mechanistic modeling of soil-plant-atmosphere hydraulics to develop quantitative measures of post-establishment agricultural drought for subsistence sorghum production under soil and rainfall conditions typical of semi-arid Eastern Botswana. Daily AET/PET ratios were calculated for 120 days following each of 15 growing period start dates over 9 growing seasons (1981/82 through 1989/90). The resulting series for each start date were used to calculate values for the total occurrences when AET/PET ≤ 0.3 for 2, 4 and 6 consecutive days and values of agricultural drought days using baseline AET/PET ratios reported in the literature. These two agricultural drought measures were compared over 3 the high-rainfall seasons (1983/84 to 1985/86) and 3 low rainfall seasons (1987/88 to 1989/90) for the 15 start dates. The mean occurrences when AET/PET ≤ 0.3 over the dry seasons were markedly higher and tended to be more variable for all growing period start dates. The mean occurrences for the 3 dry seasons showed the same pattern over the 15 start dates for all durations, but the values decreased with increasing duration in a non-linear manner. The same was true for the wet season occurrences. Agricultural drought day means were always < 0 and were more negative for the dry seasons for all start dates. Although the patterns for all measures contained low mean values, there were no well-defined minima for either the dry or wet seasons.
  M. Sadiq , G. Hassan , G.A. Chaudhry , N. Hussain , S.M. Mehdi and M. Jamil
  Amelioration of saline-sodic soil [EC=2.8 to 26.5 dSM-1, pH=9.10 to 9.73 and SAR=34.68 to 102.50 (m mol l-1)½] through land preparation methods (Cultivator, Rotavator and Disc plough) and subsequent application of Sulphuric acid (@ 20% of gypsum requirement) during crop growth was evaluated in a field study for two years at Jhottianwala site, Tehsil Pindi Bhattian, District, Hafizabad. It was observed that Disc plough was the most efficient field implement which not only ensured good yields but also enhanced soil improvement. Application of sulphuric acid also proved clearly useful by producing higher yields and promoting rapid soil improvement. The gradual enhancement of rice and wheat yields (grain and straw) and significant decrease in salinity parameters were recorded in this strategy within two years.
  G. Hassan , R. B. Reneau, Jr. , C. Hagedorn and A. R. Jantrania
  Properly functioning on-site wastewater systems (OWS) are an integral component of the wastewater system infrastructure necessary to renovate wastewater before it reaches surface or ground waters. There are a large number of factors, including soil hydraulic properties, effluent quality and dispersal, and system design, that affect OWS function. The ability to evaluate these factors using a simulation model would improve the capability to determine the impact of wastewater application on the subsurface soil environment. An existing subsurface drip irrigation system (SDIS) dosed with sequential batch reactor effluent (SBRE) was used in this study. This system has the potential to solve soil and site problems that limit OWS and to reduce the potential for environmental degradation. Soil water potentials (Ψs) and nitrate (NO3) migration were simulated at 55- and 120-cm depths within and downslope of the SDIS using a two-dimensional code in HYDRUS-3D. Results show that the average measured Ψs were –121 and –319 cm, whereas simulated values were –121 and –322 cm at 55- and 120-cm depths, respectively, indicating unsaturated conditions. Average measured NO3 concentrations were 0.248 and 0.176 mmol N L–1, whereas simulated values were 0.237 and 0.152 mmol N L–1 at 55- and 120-cm depths, respectively. Observed unsaturated conditions decreased the potential for NO3 to migrate in more concentrated plumes away from the SDIS. The agreement (high R2 values ≈0.97) between the measured and simulated Ψs and NO3 concentrations indicate that HYDRUS-3D adequately simulated SBRE flow and NO3 transport through the soil domain under a range of environmental and effluent application conditions.
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