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Articles by Abid Subhani
Total Records ( 4 ) for Abid Subhani
  Ayman M. El-Ghamry , Abid Subhani , Wael Mohd , Huang Changyong and Xie Zhengmiao
  The wide utilization of copper in agriculture and industrial processes in addition to many other uses associated with human activities causes both point and non-point source pollution of the environment with copper. Although copper is relatively non-toxic to mammals and essential micronutrient necessary for a wide variety of prokaryotic and eukaryotic metabolic activities, is toxic to all organisms if present in elevated concentrations. Copper pollution in agricultural posing soils can adversely affect the living part of soil organic matter serious threat to sustained food and fiber production.
  A.M. El-Ghamry , Abid Subhani and E. M. EI-Naggar
  A green house experiment was conducted to compare the effects of different organic residues on soil microbial biomass C (Cmic) , N (Nmic) and their ratios with total C (Corg) and N (Ntotal) in different soils. Three types of organic residues used were farmyard manure (FYM), town refuse (TR), and sewage sludge (SS), applied separately in sandy, calcareous, and alluvial soils in various concentrations of 10t/fed, 20t/fed, and 30t/fed (1fed=0.42ha). Wheat plants were harvested after 6 weeks and the soils were analyzed for Cmic, Nmic, Corg, Ntotal and pH. The addition of organic residues significantly increased the size of soil microbial biomass. The biomass C and N (Cmic & Nmic) increased consistently with increasing levels of the organic residues in the soil. The FYM was found to be more effective than TR and SS in increasing microbial biomass and this sequence was observed in all the soils used. Similarly, addition of organic residues also caused significant stimulation in Corg and Ntotal in all soils. Also, the ratios of Cmic/Nmic, Cmic/Corg percentage and Nmic/Ntotal percentage were increased with increasing levels of organic residues. The soil pH was decreased significantly with the higher rates of application in all the treatments (FYM, TR, and SS) but remained unaffected at lower rates. The linear regression between different ratios under different levels of organic residues application was also calculated.
  A. M. El-ghamry , Huang Changyong , Xu Jianming , Xie Zhengmiao and Abid Subhani
  A laboratory incubation experiment was conducted to examine the combined effects of chlorsulfuron and bensulfuron-methyl herbicides on the soil microbial biomass C (Cmic), N (Nmic) and their ratio in a loamy sand soil. The herbicides were added at four levels that were (C0B0) control, (C1B1) 0.01& 0.01, (C1B2) 0.01& 0.1 and (C1B3) 0.01&1.0 μg g–1 soil of chlorsulfuron and bensulfuron-methyl, respectively. The soil was then incubated in the dark at 25±1°C. Determinations of Cmic and Nmic were carried out at 1, 3, 5, 7, 10, 15, 25 and 45 days after herbicide application. The results showed that combined applications of herbicides have significant effect on soil microbial biomass C and N, particularly during the first 15 days of incubation, which declined after 25th day of incubation with C1B1 application rate. At 45th day of incubation, the effect of herbicides decreased significantly in C1B2 and it become non-significant as compared with the control. While, C1B3 was still found to be significant as compared to the control and C1B1 but it was at par with C1B2. The results also revealed that with C1B1 treatment the biomass C/N ratio was significantly higher within first 3 days of incubation as compared with the control. But with C1B2, the ratio was significantly different within first 5 days of incubation. While with C1B3 the ratio was found significantly higher within first 25 days of incubation as compared with the control. Increasing the application rate resulted in increased inhibitory effect on the soil microbial biomass and also combined addition of herbicides caused negatively more effect than their single application.
  Abid Subhani , Huang Changyong , Xie Zhengmiao , Liao Min and A. M. El-ghamry
  The present review paper describes the effects of various soil environmental conditions and cultural practices, e.g., soil pH, soil moisture, temperature, nutrient status, insecticide and heavy metal pollutions, on soil microbial activities particularly the dehydrogenase (DNA) or electron transport system (ETS) activity in soil. One of the general criteria used to determine microbial activity and biomass in soil is dehydrogenase/ETS activity. Dehydrogenase activity (DHA) is an indicator for potential non-specific intracellular enzyme activity of the total microbial biomass. It has been used as an indicator for active microbial biomass. Soil pH and temperature can significantly affect microbial activities in soil. It has been reported that dehydrogenase/ETS activity is higher in anaerobically or flooded incubated soils than aerobically incubated soils. Any compound, which alters the number or activity of microorganisms, could affect the soil biochemical properties and ultimately also the soil fertility and plant growth. Dehydrogenase activities increase with increasing microbial populations following amendments of soils with nutrients. The application of organic materials, which contain crop residues, animal feces and their compost, etc., to soil usually, increases the soil biomass and activities. The effects of pesticides and heavy metals addition/presence are also discussed.
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