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Subject: Computer Applications × Author: Shiva Bhambota × End date: 2016 × Type: Thesis × Thesis Type: M.Tech ×
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    Studies on effect of blade shape and rotor speed of rotavator on pulverization and mixing quality
    (PAU Ludhiana, 2013) Shiva Bhambota; G S, Manes
    A study was conducted at Punjab Agricultural University, Ludhiana to evaluate the performance of commercially available rotavator blade shapes to find out the best combination of blade shape and rotary speed of rotavator for tillage and mixing operations. Experiments were conducted on three blade shapes (L, C and J) at three rotor speeds (180, 215 and 250 rpm) in two types of soils S1 (sand 75.5%, silt 12.4% and clay 12.1 %) and S2 (sand 24.2%, silt 34.8% and clay 41%) to study the effect of blade shape and rotor speed on pulverization index, mixing index, percent reduction in bulk density and fuel consumption. These treatment combinations were compared with control (Pulverization with single pass of disc harrow followed by single pass of cultivator). For measuring pulverization index, soil samples were taken after single pass of rotavator. Standard sieve analysis method was used to find the mean mass diameter (MMD) of sample soil particles for mixing of crop mass after the operation of rotavator, the pieces of the crop which were exposed to 1/3rd of their length or more were collected and weighed to find mixing index. Percent reduction in bulk density before and after treatment by rotavator was calculated using core sampler method for pulverization and mixing operation. For measuring the fuel consumption; fuel flow meter was installed in the fuel line of the tractor. The results for each dependent parameter (pulverization index, mixing index, percent reduction in bulk density and fuel consumption) were analyzed on the basis of Completely Randomized Design (CRD) test using software “CPCS 1”. J shape blades gave minimum pulverization index (3.06 and 8.57 mm) and maximum mixing index (80.72 and 91.43 %) at 250 rpm rotor speed as compared to L and C shaped blades and control for both soils S1 and S2 respectively. The average fuel consumption was maximum for J shape blades followed by L and C shape blades respectively for both pulverization and mixing in both soil types. C shape blades have minimum fuel consumption as compared to other two blade shapes for both types of soil for pulverization and mixing operation respectively. So, J shape blade at 250 rpm rotor speed can be considered as the best combination for pulverization and mixing.