Water requirement analysis of three strawberry cultivars by using bucket-type lysimeter and its comparative study

An experiment was carried out from November, 2014 to February, 2015 at Dinajpur, Bangladesh to quantify the total water requirement of Strawberry for three indigenous cultivars RU-1, RU-2 and RU-3by using 12'' × 11.5'' Bucket-Type Lysimeter. Water requirement in zero evaporation condition for RU-1, RU-2 and RU-3 were 86.25 ± 0.23, 49.22 ± 0.31 and 73.42 ± 0.42mm respectively, which were significantly different (p< 0.01). After adding field evaporation total water requirement RU-1, RU-2 and RU-3 were 351.45 ± 0.23, 324.42 ± 0.31 and 338.61 ± 0.42mm respectively.ET0(Potential evapotranspiration)value ranged between3.21-4.56 (mm/day) while seasonal ET0 was approximately 457 (mm/season).ETc (Evapotranspiration) value measured by using Kc (Crop coefficient) value and equations provided by FAO, (2016a, b) viz. 324.24 (mm/season). As plant only uses less than 1% of its total water uptake for metabolic use, Crop water requirement (CWR) can be easily represented by ETc. However our CWR value is in line with the theoretical ETc which clearly indicates level of accuracy. Therefore, it is highly recommendable for the local Commercial Strawberry growers to get robust yield.Asian J. Med. Biol. Res. December 2016, 2(4): 672-677

Laser non-conduction limited heating and prediction of surface recession velocity in relation to drilling

Lasers find application in modifying the characteristics of metallic surfaces in industry. In the present study, a laser non-conduction heating situation is investigated and the recession velocity of the surface is computed after considering: (a) constant temperature evaporation at the surface and (b) the steady evaporation condition. It is found that, in the initial phase of evaporation, the velocity of the liquid-vapour interface (recession velocity) predicted from constant temperature evaporation at the surface condition is more realistic than that corresponding to the steady evaporation situation. Moreover, as evaporation progresses, the magnitude of the surface temperature increases because of recoil pressure developed at the vapour-liquid interface. Consequently, the surface temperature rises and the recession velocity is determined from a steady heating situation in place of that predicted from constant temperature evaporation at the surface condition.