106,344 research outputs found

    Why liberalization alone has not improved agricultural productivity in Zambia : the role of asset ownership and working capital constraints

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    The authors use a large panel data set from Zambia to examine factors that could explain the relatively lackluster performance of the country's agricultural sector after liberalization. Zambia's liberalization significantly opened the economy but failed to alter the structure of productionor help realize efficiency gains. They reach two main conclusions. First, not owning productive assets (in Zambia, draft animals and implements) limits improvements in agricultural productivity and household welfare. Owning oxen increases income directly, allows farmers to till their fields efficiently when rain is delayed, increases the area cultivated, and improves access to credit and fertilizer markets. Second, the authors reject the hypothesis that the application of fertilizer is unprofitable because of high input prices. Rather, fertilizer use appears to have declined because of constraints on supplies, which government intervention exacerbated instead of alleviating. (Extending the use of fertilizer to the many producers not currently using it would be profitable, but increasing the amount applied by the few producers who now have access to it would not be.) Policies to foster accumulation of the assets needed for agricultural production (including draft animals and implements) and to provide complementary public goods (education, credit, and good agricultural extension services) could greatly help reduce poverty and improve productivity.Economic Theory&Research,Environmental Economics&Policies,Labor Policies,Banks&Banking Reform,Agricultural Knowledge&Information Systems,Environmental Economics&Policies,Economic Theory&Research,Banks&Banking Reform,Agricultural Knowledge&Information Systems,Agricultural Research

    Montell, William Lynwood, b. 1931 (FA 961)

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    Finding aid only for Folklife Archives Project 961. Project titled: [Student Collections: Agricultural Implements] Includes survey sheets from student collections with brief descriptions of agricultural implements in Boyle County, Breathitt County, Hardin County, Lincoln County, and Taylor County in Kentucky. Sheets include a brief description, terms, and a photo of the implement

    Modifying the traditional plough - maresha - for better management of Vertisols

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    This chapter provides a brief description of relevant farmers' practices, the traditional implements used and the experience of the Joint Vertisols Project (1986-91) in developing simple and low-cost implements for Vertisols in a highland agricultural system

    Active-passive and passive-passive configurations of combined tillage implements for improved tillage and tractive performance: A review

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    Proper selection of energy-efficient agricultural machinery helps to reduce drudgery, increase cropping intensity and reduce time required for field preparation. With conventional tillage implements, multiple passes are required to obtain desired seedbed which increase soil compaction due to repeated movement of tractor in field. With combined tillage implements two or more tillage implements are combined to reduce time and fuel energy required for seedbed preparation. In this paper, various researches on active-passive and passive-passive configurations of combined tillage implements have been discussed along with their working principles. It was found that these were associated with less draft, specific energy, and tire slippage compared to conventional implements which provides a sound basis for using them with suitable engine power to improve the power utilization of tractors. Hence, use of these implements could help to reduce soil compaction, labour, fuel cost as well as save time in preparing seedbed. More analytical studies and classical approaches are needed to predict energy requirements of these implements from the knowledge of individual energy requirements of conventional implements to help in proper matching of tractor-implement and also to develop decision support systems. Considering their promising outcomes, they will emerge as effective tools to improve agricultural mechanization

    Validation of simulated dynamic behavior of sprayer boom in SOLIDWORKS through actual field experiments

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    Dynamic behavior of agricultural implements has always been a challenging topic for researchers. In precision farming, precise control of the agricultural implements is a very important task. To study the dynamics of agricultural implements, Researchers conduct field experiments as well as laboratory tests. These methods are very costly and the measurements are usually associated with some errors. Providing well-controlled experimental conditions in practice is very difficult, if not impossible. In this article, the capability of the SolidWorks in simulation and predicting the dynamic behavior of a conventional sprayer boom is discussed. To validate the results, field tests were conducted using a conventional sprayer boom. The results showed that there was no significant difference at 95% confidence level between results from computer simulation and those obtained from the field test of conventional sprayer boom.Keywords: Simulation, Boom sprayers, SolidWorks, Dynamic behavio

    Implements and methods for the preparation of agricultural soil

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    Dryland agriculture as practised in the semi-arid region ofNortheast Brazil, is mainly undertaken using a hand hoe for preparing the soils and to open up holes to receive the seed when the soil is sufficiently moist. In this.case, there is no conventional soil preparation (ploughing). The soil is only disturbed superficially by hoeing to eliminate the weeds and to reduce moisture loss due to evaporation.bitstream/item/197285/1/Manual-on-integrated-pag-45-49.pd

    Fuzzy control applied to an electrical power generation system mounted on tractors for driving of agricultural implements

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    CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORThe demand of the agricultural sector for more operationally efficient machines and implements motivated the development of alternatives for driving of this equipment. Aiming an electrical supply to apply in agricultural implements, this study proposes a system that uses the tractor power take off to activate a synchronous generator, using a fuzzy logic controller designed to regulate the generated voltage level. Different control architectures were tested and evaluated by simulations. In the initial stage were evaluated fuzzy PI, fuzzy PD and fuzzy PID controllers of multiple inputs and single output (MISO) and the error of the generated voltage as state variable. Subsequently, it was evaluated a fuzzy PI controller of single input and multiple outputs (SIMO) with a modified rule base for the system. In the final stage, the angular drive speed was included as state variable of the controller. The behavior of each architecture was analyzed by means of performance indexes. The results show that among the tested controllers, the modified fuzzy PI SIMO presented the best performance values while maintaining the operating variables within the established limits.The demand of the agricultural sector for more operationally efficient machines and implements motivated the development of alternatives for driving of this equipment. Aiming an electrical supply to apply in agricultural implements, this study proposes a365846857CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORsem informaçã

    A study of agricultural implements

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    Thesis (B.S.)--University of Illinois, 1904.Typescript

    Agricultural tools and implements industry in Bangladesh: a case study

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    Vibration analysis on driver’s seat of agricultural tractors during tillage tests

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    The vibration of the driver’s seat of agricultural tractors was investigated during three alternative tillage operations. Three tractors including a range of specifications were considered, at a range of forward speeds. The interactions between the tractors, implements and speeds were examined using the SPSS program and the GLM-ANOVA method. The results analysis indicated that the tractors played the first major role in vibration development in the lateral axis and was followed by the implements. In contrast, the implements played the first major role in the development of vibration in the horizontal axis and are followed by factor tractors. The statistically significant effect in vertical and horizontal axes shows the factor implements. In addition, the statistically significant effect in the vertical and lateral axes shows again the implements to be the most significant factor. Of the implements, the plough shows the highest vibration and displays statistically significant difference in comparison with the other implements
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