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Search Results: 1 - 10 of 407307 matches for " M. Umar Khan "
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A System of Farming Response of Rice to Zinc Fertilizer in Calcareous Soils of D. I. Khan
M. Umar Khan,M. Qasim,M. Jamil
Asian Journal of Plant Sciences , 2002,
Abstract: Response of rice variety IRRI-6 to various levels of zinc was studied in a pot culture experiment. Zinc was applied at the rate of 0, 5, 10 and 15 kg ha-1 in the form of ZnSO4 along with a basal dose of 175 kg N, 110 kg P2O5 and 100 kg K2O ha-1. The results showed that all the yield and yield components of rice increased significantly with increasing level of zinc fertilizer. However, significantly maximum plant height, average number of productive tillers per plant, panicles per plant, spikelets per panicle, 1000 paddy weight and grain and straw yield were obtained where Zn was applied at the rate of 10 kg ha-1 which was statistically at par with the treatments receiving Zn at the rate of 15 kg ha-1 except number of spikelets per panicle of rice.
Effect of Different Levels of Zinc on the Extractable Zinc Content of Soil and Chemical Composition of Rice
M. Umar Khan,M. Qasim,M. Jamil
Asian Journal of Plant Sciences , 2002,
Abstract: A pot experiment was carried out to study the effect of different levels of Zn viz., 0, 5, 10 and 15 kg ha-1 along with a basal dose of NPK (175 kg N, 110 kg P2O5 and 100 kg K2O ha-1) on the Zn content of soil and chemical composition of rice Zn content of soil, leaves, roots, grain and straw of rice increased significantly with an increase in Zn fertilization. Similarly, significant maximum N and K content of rice grain and straw were found where zinc was applied @ 15 kg Zn ha-1. However, a decrease in its P concentration was found with
Response of Rice to Different Methods of Zinc Application in Calcareous Soil
M. Umar Khan,M. Qasim,M. Subhan,M. Jamil
Journal of Applied Sciences , 2003,
Abstract: In a field experiment, comparative effect of three different methods of zinc application was studied, aimed at alleviating Zn deficiency in transplanted flood rice (cv.IRRI.6) grown in alkaline calcareous soil. Three methods were tried i.e. nursery root dipping in 1.0% ZnSO4, 0.20% ZnSO4 solution spray after transplanting and 10 kg Zn ha-1 by field broad cast method. Zinc content of soil before flowering and after harvest was increased significantly for all the methods. The yield and yield parameters increased significantly by the application of Zn by any method. Among the methods the effect of Zn was non-significant on yield components like tillers m-2, spikelets panicle-1, % filled grains, 1000-grain weight and straw yield. However, soil application of Zn @ 10 kg ha-1 was rated superior because it produced significantly higher paddy yield.
Effect of Zinc Application by Different Methods on the Chemical Composition and Grain Quality of Rice
M. Umar Khan,M. Qasim,M. Subhan,Riazud Din Ahmad
Journal of Applied Sciences , 2003,
Abstract: A field experiment was conducted to evaluate the comparative effect of Zn levels applied by different methods i.e. nursery root dipping in 1.0% ZnSO4, 0.20% ZnSO4 solution spray after transplanting and 10 kg Zn ha-1 by field broad cast method. A significant increase in Zn content of rice leaf before and after flowering and a significant decrease in P content of straw and paddy and starch content of paddy was recorded for all the methods. N, K and Zn of paddy and straw and Zn contents of roots increased significantly with the application of zinc irrespective of the methods over control. Soil application of Zn was rated superior because it gave significantly higher content of N in rice paddy.
Characterisation of Temperate Urban Lacustrine Surface-Sediments for Minerals and Metals in Comparison with Geochemical Indices and Sediment Quality Criteria  [PDF]
Umar Nazir, Anisa B. Khan
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.910068
Abstract: The present surface sediment assessment in two temperate lacustrine ecosystems in the region of anthro-urban intensification in less than a century of progressive human history identifies ecosystem responses through space-time monitoring of variable spectrum and their gradients. Sediments have almost no outliers in box-plots across the select sites that suggest their tranquil nature. But temporal fluctuations in pH, bicarbonates, conductivity, OC, OM, TN and C/N can be visualised during Ca-Si dominance. The estimated percentage elemental composition of surface sediments on dry weight basis revealed the order Si > Ca > Mg > K > Na > P > S > Cl. Besides, the micro and trace element quantification represent the descending series of Fe > Al > Zn > Mn > Cu > Cr > Ni > Co > As > Sn > Pb > Cd while Hg and Se remained below detection level (BDL). Sediment pH remained on the basic side but slight acidic nature is noticed during late summer. Significant correlation occurs for conductivity with organic C and organic matter (p < 0.01) as the latter serves an established source for nutrient ions. Similar is the case with sediment organic C, organic matter and total N as being complementary to one another. A general slight gradual decline in nutrient concentration till culmination of active macrophytic growth phase can be associated with active/passive bioaccumulation or anoxic release from sediments. The Enrichment Factor classifies each trace element into “No Enrichment” class to “Very High Enrichment” category. The Geochemical Index (Igeo) scale labels “Unpolluted” to “Highly Polluted” element groups in sediments. The construal of Contamination Factor differentiates between “Contaminated” and “Uncontaminated” score of elements. Integrated Pollution Index (IPI) and Pollution Load Index (PLI) also categorize the sites and lakes. Sediment Quality Guidelines (SQG’s) when compared to observed mean values for various elements point to pollution status and associated ecological risks involved.
Diallel Analysis for Estimating Combining Ability of Quantitatively Inherited Traits in Upland Cotton
Mohammad Subhan,M. Qasim, Riaz-ud-Din Ahmad,M. Umar Khan,M. Amin Khan
Asian Journal of Plant Sciences , 2003,
Abstract: An 8×8 diallel analysis study on cotton (Gossypium hirsutum L.) was launched in the Department of Plant Breeding and Genetics, Faculty of Agriculture, Gomal University, D.I. Khan, Pakistan during, 1996-99 to estimate the combining ability analysis in the inheritance and expression of some significant quantitative characters like, height of main stem, number of bolls plant-1, yield of seed cotton plant-1, boll weight and lint percentage using Griffing’s Method- II, Model-1 in F1 generation. The mean squares for General combining ability (GCA) effects, (SCA) effects and reciprocals effects were observed to be highly significant for all the mentioned characters. The estimates of component of variance clarified that the variance due to SCA was much higher in magnitude and more vital than GCA for traits like height of main stem plant-1, number of bolls plant-1, yield of seed cotton plant-1 and boll weight showing thereby the predominance of non additive type of gene action with (dominance or epistatic effects) in the inheritance of these traits. Whilst GCA was much higher in magnitude and more vital than SCA reflecting the role of additive type of gene action in case of lint percentage.
Studies on Phospholipase A from Melia azadirachta (Neem) Seeds Extract
M. Umar Dahot,A.B.Ghanghro,M. Yousuf Khan
Journal of Biological Sciences , 2001,
Abstract: The crude extract from dried Melia azadirachta seeds was prepared and it was noted that the seed contains sufficient amount of phospholipase A activity. Optimal activity of Melia azadirachta seeds was found at pH 6.0 and at temperature 35 C. The stability of enzyme was noted over the pH range 5-8. More than 30% activity of phospholipase A remained active up to 60 minutes at 60 C. The enzyme activity was markedly increased in the presence of calcium, manganese and zinc but it was decreased by the addition of EDTA.
Performance Evaluation of a Hiperlan Type 2 Standard Based on Arithmetic Formats
Adnan Umar,Marwan M. Al-Akaidi,Shahid Ahmed Khan,Shahid Khattak
Information Technology Journal , 2004,
Abstract: An optimum fixed-point word length to implement the physical layer of Hiperlan type 2 is proposed in this paper. The software based HIPERLAN/2 WLAN standard is implemented based on fixed-point and floating-point arithmetic formats. Extensive simulation technique is used to analyze the effect on performance of different word lengths of fixed point data representation the HIPERLAN/2 system. The results obtain could also be used as a guideline to select the optimum hardware for the systems based on OFDM technique. It is shown that a simple fixed-point based architecture could be used to implement the physical layer of Hiperlan/2 standard. By using the software models the proposed fixed-point architecture`s performance is compared to that of a reference complex and accurate floating point based architecture.
Sewage Sludge: An Important Biological Resource for Sustainable Agriculture and Its Environmental Implications  [PDF]
Khalid Usman, Sarfaraz Khan, Said Ghulam, Muhammad Umar Khan, Niamatullah Khan, Muhammad Anwar Khan, Shad Khan Khalil
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.312209
Abstract: Intensive farming generally needs large addition of organic matter to maintain fertility and enhance crop yields. Sewage sludge/biosolids are by-products of municipal and industrial wastewater treatment and a rich source of organic nutrients. Sewage sludge having high content of organic matter, macro- and micro-nutrients, can be used as fertilizer/soil conditioner for food, vegetable crop, horticultural plants and pasture, which in most cases can be beneficially recycled. In the past sewage sludge was regarded as a waste product due to expected high level of contaminants such as pathogens, pollutants and synthetic materials discharged in sewer from homes and industries, which were often incinerated, dumped in occasion or land fill. As a result of rapidly increasing population, urbanization and industrialization, wastewater production and sewage sludge generation have increased manifold. Due to high cost of mineral fertilizers and escalating trends in their prices, there is an increasing trend of using sewage sludge in agriculture, especially under intensive cropping in arid and semi arid regions of the country. Therefore, application of sewage sludge to agricultural soils may be sustainable and economical due to nutrient cycling and disposal of sewage sludge. However, there may be a risk in use of sewage sludge due to potentially harmful contents present in the sludge such as heavy metals and pathogens. This paper, therefore, presents a review on various aspects of sewage sludge used in agriculture.
Weeds of Wheat Crop and Their Control Strategies in Dera Ismail Khan District, Khyber Pakhtun Khwa, Pakistan  [PDF]
Sarfaraz Khan Marwat, Khalid Usman, Niamatullah Khan, Muhammad Umar Khan, Ejaz Ahmad Khan, Muhammad Anwar Khan, Aziz ur Rehman
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.41011
Abstract: This study is based on research work conducted during 2008-2010 inDera Ismail Khan, KPK,Pakistan. The research area was extensively surveyed to investigate weed species. About 32 weed species, belonging to two monocot and thirteen dicot families, were collected from the study area. Plants were identified with the help of available literature and by comparing with the already identified plant specimens of the herbarium ofQuaid-i-AzamUniversity,Islamabad,Pakistan. Data inventory constitutes botanical name, vernacular name, English name, family, and flowering and fruiting period. Phalarus minor, Rumax dentatus, and Chenopodium album were the dominant weeds in the study area having comparatively higher relative weed density. Weeds having tough competition with wheat crop for light, moisture, and nutrients adversely affect wheat production. Hence, a constant effort is needed to keep the weed population under control. Many methods of weed control and eradication have been devised but chemical control is the most effective one. However, it may have some environmental consequences if not handled properly.
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