4 Records out of 22207 Records

A mechanisation strategy model for small-scale farms in the Siaya District of Kenya.

Author: McRota, H J

Awarding University: Cranfield University, England

Level : PhD

Year: 1997

Holding Libraries: Index To Theses ;

Subject Terms: Agriculture ; Siaya District ; Agricultural machinery ;

Abstract:

As yet there is no agricultural mechanisation strategy for any specific area of Kenya so this prompted the present study. Farm surveys were undertaken in 1994 for a period of 12 months to determine conditions in Siaya District necessary for improving crop production and also to establish an inventory of machinery and labour available amongst the small-scale farms. The collected data was statistically analysed and the costing information used for break-down analysis concerning machinery ownership. Linear programming techniques have been utilised to model different farming situations and help make decisions concerning mechanisation. Alternative sources of power were considered, namely hand labour, oxen and tractors. Where tractors were used for primary tillage the crops provided significantly higher grain yields than those where hand and oxen were used mainly due to improved timely cultivations. The costs of cultivation however, revealed that oxen were more than 5 times as expensive than hand and 45 percent more than tractors. For example, the costs of ploughing using oxen costs KSh 3766 whereas; tractors cost KSh 2082 hand labour costs KSh 568 and per hectare. Although extensive use of all the three power sources has been recommended, eventual replacement of ox-cultivation in some areas so that tractor cultivation can be achieved on 50% of all the land within 10 years is recommended. This would only be feasible if second hand 35 kW and 45 kW or equivalent cheaper tractors could be made available to individual farmers, co-operatives and contractors. In addition the government should also improve its tractor hire service and establish rural servicing stations with a view to eventually privatising the service. For the acquisition of machinery, equipment and hand tools, a budget has been worked out for agricultural further mechanisation within Siaya District for five years a head. The loans for the purchase of tractors, machinery and oxen could be repaid within this period. In future the budget and direction of the agricultural mechanisation strategy will be subject to annual review depending on the feed back from the field on the progress of the programme.

An investigation of the field performance of light mouldboard ploughs at slow speeds [Kenya].

Author: Owended, P M O

Awarding University: University College, Dublin, Ireland

Level : PhD

Year: 1996

Holding Libraries: ;

Subject Terms: Agriculture ; Agricultural machinery ; Performance evaluation ;

Abstract:

The mouldboard plough is the standard tillage implement used with animal traction in Kenya. The range of ploughs include the Victory?, Rumpstad? winding body and the Rumpstad cylindrical body ploughs. These are used under varying soil types, and modes of operation. However, their typical loading characteristics and the comparative capability to achieve and maintain the desired range of operating depth under the conditions encountered are obscure, hence, their adaptability to the different edaphic conditions is unknown. The objectives of this study were therefore: to investigate the performance of the standardized mouldboard ploughs that are intended for use with animal traction in soils of agronomic importance in Kenya, and; to develop criteria for optimizing the utilization of draught animal mouldboard ploughing systems used in Kenya. The uniqueness of this research is that novel instrumentation was developed and used to investigate the performance of light mouldboard ploughs under practical edaphic conditions. Data that were previously not available in the literature were generated and used to develop criteria for optimal utilization of mouldboard ploughs at speeds and depths commensurate with the use of draught animals. A low cost and transportable micro-computer based data acquisition system was developed to measure and monitor the implement draught, vertical reaction/suction, moment about the vertical shank, ground speed and working depth. A study of four mouldboard ploughs in three soil types was conducted, under dry and wet soil moisture regimes. The three soil types were the clay Nitosol, sandy clay loam Pellic Vertisol and sandy loam Ferralsol. The experiments were carried out at speeds up to 1.12 m/s and tillage depth below 150 mm which are typical of tillage with animal traction

Development and performance of a toolframe for mechanical sugarcane stool destruction

Author: Owende, Philip M O

Awarding University: University of Nairobi, Kenya

Level : MSc

Year: 1990

Holding Libraries: University of Nairobi Upper Kabete Library ;

Subject Terms: Agriculture ; Agricultural machinery ; Sugarcane ;

Abstract:

ABSTRACT NOT AVAILABLE

Steering response analysis of an animal-drawn mouldboard plough [Kenya].

Author: Mutua, J M

Awarding University: Cranfield University, England

Level : PhD

Year: 0

Holding Libraries: Index To Theses ;

Subject Terms: Agriculture ; Agricultural machinery ; Performance evaluation ;

Abstract:

The importance of the animal-drawn mouldboard plough in Kenyan small-scale farming sector is reviewed and the operational problems associated with the implement leading to poor seedbed, poor weed control and operator fatigue. The research aims at firstly providing an insight on the dynamic behaviour of the Victory mouldboard plough when responding to a steering input, and secondly, based on the findings of the dynamic behaviour, advises on design and operational criteria aimed at improving the dynamic performance, hence the quality of work and reduced operator fatigue. There are three parts to this research: part one deals with the theoretical analysis. Here the mathematical equations governing the lateral dynamic behaviour of the animal-drawn mouldboard plough are developed. Part two deals with the experimental verification of the theories developed in part one. Extensive experiments were carried out in the soil bin using a fully instrumented Victory mouldboard plough to test its response to a steering input under different set of parameters viz: two hitch lengths, two hitch points and three different sizes of landsides. Part three advises on the operational criteria aimed at improving the lateral stability and steering responses of the plough under different operating conditions