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Author: KAU × End date: 1996 × Start date: 1996 × Type: Thesis × Thesis Type: M.Tech. ×
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    ThesisItemOpen Access
    Design, fabrication and testing of a power operated paddy dibbler
    (Department of Farm Power Machinery and Energy, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1996) Jayarajan, R; KAU; Jippu, Jacob
    A 2-row power operated paddy dibbler was designed, fabricated and tested at Kelapaji College of Agricultural Engineering and Technology, Thavanur. The main components of the dibbler were two seed boxes, plungers reciprocating within the seed tubes, fluted roller seed metering mechanism, dibbler wheels, stationary cam, frame and transport wheels. The seed tubes were fixed radially around the dibbler wheel with 45 mm of it projecting outwards for penetrating the soil. The plunger was actuated by a stationary cam and during its upward stroke it uncovered the farther end of the seed transfer tube and transferred the seeds into the seed tube and then into the holes made in the soil. In the downward stroke the plunger closed the seed transfer tube. Simultaneously the fluted roller transferred the seeds in to the seed transfer tube. The average speed of operation of the dibbler was 1.32 kmph and its field capacity and field efficiency were 0.031 ha/h and 78.18 per cent respectively. The average number of seeds dropped per hill was 5 and the seed rate obtained was 78 kg/ha. The seeds were placed within the confines of the holes made by the seed tube and plunger. There was absolutely no scattering. The depth of placement varied from 3.8 to 4.6 cm. The operating cost of the dibbler was Rs. 502.58/ha. This mechanism offers scope for developing dibblers with more number of rows for being operated more economically.
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    ThesisItemOpen Access
    Monthly water balance model for lateritic hill slope- a case study
    (Department of Land and Water Resources and Conservation Engineering, Kelappaji College of Agricultural Engineering and Technology, Tavanur, 1996) Beena, Thomas; KAU; Noble, Abraham
    The groundwater balance of K. C. A. E .T. Campus, Tavanur, Kerala has been studied and a deterministic model has been developed for the prediction of depth to water table in this hill slope based on Darcy’s equation. The input data required are the precipitation, evapotranspiration, specific yield, initial water table, elevation of the points under consideration and the distance between the points. The weekly precipitation and evapotranspiration were calculated and from this the recharge to groundwater was estimated. The groundwater recharge was taking place only during the southwest monsoon season. The change in storage divided by the hydraulic gradient for a period without rainfall i.e., from 01 December 1994 to 16 February 1995 were determined. Using these values and other inputs in the model, the depth to water table for a period from 26 May 1994 to 25 May 1995 were estimated from the model. These values were compared with the observed values for the same period. It was found that the estimated values give a reasonable estimate of the depth to water table in the study area. This model can be used to predict the changes expecting in the water level in a particular region. The model has several areas of application in the fields of groundwater resource development and irrigation. The infiltration characteristics of the selected area was evaluated and observed that the infiltration rate was increasing towards the higher elevation. The model was simulated for different percentages of effective rainfall and found that, at 50 per cent it accounts as groundwater recharge and the rest as surface runoff.