Journal of Basic and Applied Sciences  -   Volume 8 Number 2

 Effect of Different Infestation Levels of Chilo Infuscatellus (Snellen) on Quantity and Quality Parameters of Sugarcane

 Raza Muhammad, Maqsood Anwar Rustamani, Nazir Ahmad and Qadeer Ahmad

 http://dx.doi.org/10.6000/1927-5129.2012.08.02.67

Abstract: Population dynamics of sugarcane stem borer on commercial varieties of sugarcane were evaluated. The adults of Chilo infuscatellus (Snellen) emerged from over wintering larvae during fourth week of February. The population of adults of C. infuscatellus remained low in early vegetative growth stage of sugarcane crop. The number of moth/ trap increased gradually as the growth of the crop advanced and the maximum population of 37.4± 2.20 was recorded during August. When mean number of 18.98 moth/ trap were collected. The population of C. infuscatellus was declined after August and 28.6±2.42, 14.6 ± 1.74 moths were captured/ trap in month of September and October, respectively. The infestation of sugarcane stem borers was inversely proportional to the quantity and quality of sugarcane. Maximum cane weight of 13.5 ± 0.21 and 12.1± 0.05 kg were recorded in CPF-237 and Thatta-10 varieties at 0% infestation level, while minimum at 20% infestation (9.3±0.12 and 8.5 ±0.12 kg), respectively. Highest sugar recovery (11.0 ±0.08 and 10.2±0.11%) was observed at 0% infestation while lowest (9.3±0.12 and 8.5 ±0.12%) at 20% infestation in both the varieties.

Keywords: Infestation, Chilo infuscatellus, quantity, quality, sugarcane.

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The Effect of Grain Size on Radon Exhalation Rate in Soil Samples of Dera Ismail Khan in Pakistan

Tabassum Nasir and Nisar Ahmad

http://dx.doi.org/10.6000/1927-5129.2012.08.02.29

Abstract: Radon concentration and its exhalation rate has been measured from twenty five soil samples collected from seven different locations of Dera Ismail Khan, in the north west of Pakistan. These samples were crushed after drying and passed through sieves with different sizes of pores to get three grain sizes, £0.595 mm, 0.595-2.00 mm and 2.00-4.00 mm of soil. CR-39 based NRPB (National Radiological Protection Board) radon dosimeters have been used to measure the radon concentration and exhalation rates. The maximum average value of radon exhalation rate has found to be: (3.57±0.38) Bq m-2 hr-1 in the samples having grain size 2.00-4.00 mm and the minimum as: (2.21±0.26) Bq m-2 hr-1, in the samples with grain size £ 0.0595 mm. This indicates that the radon exhalation rate increases with the grain size. The maximum average value of radon exhalation rate has been found in samples collected from river side where soil texture is silty clay loam. The obtained values of radon exhalation rate for all the samples are well below the world average value of 57.60 Bq m-2 hr-1.

Keywords: Radon concentration, Radon exhalation rate, grain size, soil texture.

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