Mansoor Khattak - Academia.edu (original) (raw)

Uploads

Papers by Mansoor Khattak

Pakistan Journal of …, 2005

... 1990. Effect of deep tillage on grain yield of wheat under rainfed conditions. Pak.J. Agric. ... more ... 1990. Effect of deep tillage on grain yield of wheat under rainfed conditions. Pak.J. Agric. Res. 2(2): 78 - 83. Majid, A., M. Shafiq and M. Iqbal. 1986. Deep tillage and sowing techniques in maize production under high rainfed conditions. Pak. J. Agric. Res. 7(3): 181-185. ...

Pakistan Journal of Biological Sciences, 2000

Persimmons (Diospyros Kaki. L) were dried using a 1.8 m 2 flat plate solar collector connected wi... more Persimmons (Diospyros Kaki. L) were dried using a 1.8 m 2 flat plate solar collector connected with a drying chamber under three different drying temperatures of 45, 55, 65 o C and slice thickness of 0.5, 1.0 1.5cm to examine the retention of vitamin C during drying. It took 13 hours when persimoons were dried at 65 o C, 16 hours under 55 o C and 18 hours under 45 o C to reach to less than 10% moisture content with an average drying rates of 0.12, 0.14 and 0.15 gH2O.gd.m -1 respectively. Analysis of variance was done using two factorial completely randomized design. The analysis of variance showed that both the factors significantly (α<0.05) affected the retention of vitamin C in persimmons.The mean comparison showed an increase in drying temperature from 45 to 65 o C caused an increase in moisture loss and drying rate while a decrease in vitamin C content of persimmon slices. Similarly increase in slice thickness from 0.5 to 1.5cm caused a decrease in moisture loss and drying rate per hour while increasing in retention of vitamin C in persimmons. The correlation between vitamin C content of persimmon at different slice thicknesses and drying temperatures showed that there is a strong negative correlation between drying time and moisture lost and drying rate with values of -0.991 and -0.997. It was concluded that persimmons may be dried at a temperature lower than 50 o C and slice thickness more than 1.0 cm to get dried persimmons rich in vitamin C.

Pakistan Journal of Botany

The influence of storage temperature on post storage fungal prevalence and quality of citrus frui... more The influence of storage temperature on post storage fungal prevalence and quality of citrus fruit (sweet orange cv. Blood Red) was investigated at the Horticultural Laboratory of Khyber Pakhtunkhwa Agricultural University, Peshawar. The fruits were exposed to 5, 10 and 20 °C for 45 days and then kept at ambient temperature for 25 days. The fruits were evaluated for disease incidence and other quality attributes at 5 days incubation to the maximum of 25 days. Results indicated that disease incidence and prevalence of Penecillium itallicum and Penecillium digitatum were higher in fruits stored at 5 and 20°C and were lower at 10°C. Weight loss was higher in the fruits stored at 20°C followed by 5°C and was lower at 10°C Ascorbic acid was higher in fruits stored at 10°C followed by 5 and was lower at 20°C. Disease incidence and prevalence of Penecillium itallicum and Penecillium digitatum and weight loss increased while ascorbic acid decreased with increase in post storage incubation from 0 to 25 days. It is concluded that storage of citrus fruits at 10°C performed better in terms of fight against disease and fungal prevalence and perseverance of quality.

Science, Technology and Development

The experiments were conducted to see the impact of drying methods and extraction solvents on the... more The experiments were conducted to see the impact of drying methods and extraction solvents on the yield of steroidal saponins of Tribulus terrestris. The plant was dried by three different drying methods namely, solar collector drying, open sun drying and shade drying. After drying different levels (25-100%) of extracting solvent in the form of ethanol, methanol and distilled water were used for extraction. Soxhlet apparatus was used for extraction, while the gas chromatography apparatus was used in the experiment for detecting steroidal saponins in Tribulus terrestris. After extraction, four saponins identified were Tigogenin, Gitogenin, Hecogenin and Neohecogenin. The maximum yield of 61.2% was recorded for flat plate solar drying with 75% ethanol solution, followed 49.5% in shade drying with the same extraction solvent level. The lowest value of 3.1% yield was recorded for distilled water with open sun drying method. It was concluded that Both the drying methods and extraction solvent have a direct effect on the yield of steroidal saponins extracted from Tribulus terrestris. A maximum yield of almost 60% saponins may be achieved, if Tribulus terrestris is dried using a flat plate solar collector and extorted with 75% ethanol solution using GC-MS technique. Open sun drying minimizes saponins in Tribulus terrestris, while distilled water is the worse extracting solvent for extraction of steroidal saponins from Tribulus terrestris.

Proceedings of the Pakistan Academy of Sciences

A concentrating solar collector was developed for convective drying of green chilies by providing... more A concentrating solar collector was developed for convective drying of green chilies by providing optimum drying environment. A temperature in the range of 45-65 o C and relative humidity of less than 10% was observed during the drying period provided by the solar collector from 9.00 am to 5.00 pm. Different levels of drying temperature and air mass flow rates were tested to find their effect on drying time of the chilies. The experiment was laid out as a randomized complete block design with a factorial arrangement of the treatments consisting of 3 levels of temperature and 3 levels of air mass flow rate, replicated 3 times. Drying temperature and air mass flow rates effected the drying time significantly. The means comparison showed that minimum drying time of 17.96 h was recorded at high temperature of 65 o C followed by a drying time of 20.27 and 21.43 h at temperatures of 55 and 45 o C. The means of air mass flow rates showed that minimum drying time of 18.49 h was noted at high air mass flow rate of 3.50 kg min -1 followed by 20.32 and 20.86 h at air mass flow rates of 1.5 and 2.30 kg min -1 . Chilies dried at temperature of 65 o C and air mass flow rate of 3.5 kg min -1 showed an average drying rate of 0.02 g (H 2 O) hr -1 cm -2 as compared to the slow drying rates at 55 and 45 o C. It was concluded that chilies must be dried at high temperature and high air mass flow rates to get on time quality dried chilies.

Two main types of wheat flours that are fine and branded flours used in Khyber Pakhtunkhwa, Pakis... more Two main types of wheat flours that are fine and branded flours used in Khyber Pakhtunkhwa, Pakistan, were analysed for their particle size. Sieve analysis was carried out which gave eight samples of different particle sizes, divided into fractions and ranged from 63-100, 100-250, 250- 350 and larger than 350 µm. All the four sizes of the each flour type were analysed for their protein content, using Kjeldahl method by Kjeltec-1002 apparatus. The results showed that more proteins (11.8%) were recorded in fine flour as compared to (11.3%) in branded flour. Also it was observed that reducing the size from 350 µm to 63 µm caused 13% protein loss in branded wheat flour and 11% in fine flour. It was concluded that wheat flour with particle size smaller than 350-250 µm significantly lost its protein content. So it is recommended to grind wheat in such a way that the particle size remains greater than 250 µm.

Solar irradiance was recorded by Pyranometer in 2012 on horizontal, vertical and Latitude at Pesh... more Solar irradiance was recorded by Pyranometer in 2012 on horizontal, vertical and Latitude at Peshawar, Pakistan. Perfect correlation was established between solar irradiance at different tilted surfaces and month of the year. The irradiance was high at a tilt angle of 340 (equal to the latitude of Peshawar-Pakistan) with R2 value of 0.989. Chi-square goodness of fit test showed that there is a significant (P < 0.001) increase in daily solar irradiance if we changed the angle from vertical to horizontal. Also there is a significant (P < 0.000) increase if we changed the angle from both vertical and horizontal to Latitude level. Five different solar irradiance models namly Dissing and Wendler, Iqbal, Loutzenhiser et al., Salaymeh and Ali et al were evaluated in terms of two statistical criteria including correlation coefficient (R2) and root mean square error (RMSE ) to find the correlation of solar irradiance among different tilt angles. In the lights of the investigations it i...

Journal of agricultural research

Science, Technology and Development, 2015

The study corresponds the role played by AKARI-II for exploring the lives of stars in the space. ... more The study corresponds the role played by AKARI-II for exploring the lives of stars in the space. AKARI-II officially famous as ASTRO-F, launched on 21 February, 2006 is the second Japanese satellite on a space mission to carry out sky-high observations for exploring the lives of stars in the space using infrared technology. It has a telescope fitted with an Infrared camera which has a spectral range of 2-26 µm and the Far-Infrared Surveyor has a range of 50-180 µm. The mirror of the telescope is made up of sandwich type silicon carbide, which is kept cool by 180 L of liquid Helium for sensitive observations. AKARI performs All-sky survey and collect images of very small portions of galaxies in the space. It gives pictures which show the lives of stars. The brighter the stars, the younger are they considered to be.

Journal of Advances in Biology & Biotechnology, 2015

The study was conducted to know the prevalence of Giardia spp in different sources of water in Di... more The study was conducted to know the prevalence of Giardia spp in different sources of water in District Karak Khyber Pukhtunkhwa, Pakistan. Methods of Study: A total of 65 water samples was collected from different villages of District Karak was tested in the lab of the Department of Zoology in Kohat University of Science & Technology with the method of using PCR (Polymerase chain reaction) to detect the prevalence of G in tube well, bore, drainage and tap water. Results: From the result the prevalence of G in tube well, drainage and bore water were found 10.76%, 1.53% and 1.53% respectively while in the sample of tap water there will be no prevalence of G was detected. Conclusion: From the result it was concluded that a proper treatment of water for human consumptions is required.

Pakistan Journal of Nutrition, 2013

Solar drying of fruits, vegetables and grains is the oldest processing technique used for food pr... more Solar drying of fruits, vegetables and grains is the oldest processing technique used for food preservation. In this research a flat plate solar air heater having an efficiency of 20% was used for drying onion flakes. The solar air heater assembly provides a temperature in the range of 40-50°C and humidity 10-30% in each day of drying period to the drying section. The drying section provides a total of 6 hours period per day as a suitable range for onions drying. Onions were dried and drying curves were developed for the drying kinetics of onions. The initial moisture in onions was 93% which was reduced to 5%. The moisture loss curve shows that onions lost 11% in each hour at an average. The drying curves of drying rate shows that the average drying rate of onions was 0.30 gH2O. gDM/h. Five published models (Newton, Page, Modified Page, Two-term expo and Wang) were tested to find relationship of drying curves with drying time. Among the five models Two-term expo model was the best describing drying kinetics on onions with R value 2 0.974 and Root Mean Square Error 0.447 for moisture lost and 0.953 and 0.451 for drying rate. It was concluded that flat plate solar air heater dries onions in short period of time. The quality of onions dried by a flat plate solar air heater may be better than open sun drying system. Among the five models Two-term expo model was the best describing drying kinetics on onions.

Communications in Soil Science and Plant Analysis, 2013

ABSTRACT The drainage system, although it reclaims waterlogged soils, poses a potential threat to... more ABSTRACT The drainage system, although it reclaims waterlogged soils, poses a potential threat to leaching of valuable nutrients. To assess the micronutrient losses from such system established more than two decades ago in the plains of northwestern Pakistan, drainage waters were periodically analyzed for selected micronutrients. The inputs of micronutrients in irrigation waters were also determined. The micronutrient removal in drainage water was 1.39 to 9.79 times greater than micronutrient inputs in irrigation waters and fertilizers. Among micronutrients, the removal of copper (Cu) and manganese (Mn) in drainage water was greater than iron (Fe) and zinc (Zn). The concentrations of micronutrients generally changed with cropping (sampling time), increased with soil depth, and were invariably negative on the nutrient balance sheet, suggesting that these nutrients are continuously depleted from the system in drainage water. These nutrients therefore must be replenished in soil through an appropriate means for optimum crop yields under the given drainage–irrigation–cropping system.

Influence of Synthetic Zeolite Application on Morphology, yield and quality of Soybean grown on a... more Influence of Synthetic Zeolite Application on Morphology, yield and quality of Soybean grown on allophanic Soil. Khan, Amir Zaman (2007) Influence of Synthetic Zeolite Application on Morphology, yield and quality of Soybean grown on allophanic Soil. ...