This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.

No description available.

Revised; Originally Published: 2006 / 7 pp.

A tractor mounted three-point hitch implement was developed to extract and collect subsurface trickle irrigation laterals from the soil. Power to the implement was supplied by the tractor hydraulic system to the three-point hitch and two remote hydraulic circuits. In operation, the implement loosened the soil around the lateral, extracted the tubing from the soil, wound it on a reel assembly, and then dropped the roll of tubing at the end of the row. Draft power requirements averaged 14.5 kW (19.4 hp) and hydraulic power averaged 0.56 kW (.75 hp) when the one row implement was operated at 7.2 km/h (4.5 mph). Field capacity of the one row implement averaged 0.19 ha/hr (.47 ac/hr) when operated in 100 m (328 ft) long rows.

The problem of food insecurity in developing countries is an enormous challenge. In rural communities, it is a perennial problem that requires undivided attention to ensure household food security. This paper seeks to define the role of rural participation in providing household and community food security with a particular focus on Lower Gweru irrigation project in Zimbabwe. The research comes in light of increased food deficit in Zimbabwe that has been compounded by failed politics, climate change and weather extreme events. Data was gathered using self-administered questionnaires, direct observation and literature review. Data was analysed using the Microsoft Excel 365 ToolPak and Health24 Web Calculator. This paper highlights the importance of rural irrigation schemes in addressing community and household food security and ensuring health nutrition uptake by irrigators and surrounding communities. Rural irrigation systems enable farmers to become net food sellers allowing them to benefit from food price volatility. It also highlights the resultant development and makes recommendations for future irrigation developments

Call number: LD2668 .T4 1959 M35

Comment les habitants ont-ils vécu d’une part la construction dans les années 1970 d’un grand périmètre irrigué dont les terres ont été collectivisées, d’autre part la décollectivisation intervenue une vingtaine d’années plus tard ? Ces deux événements constituent deux ruptures qui modifient à chaque fois les conditions de vie et de travail ainsi que l’environnement des habitants à travers l’occupation des sols, les services publics et les paysages. Trois périodes se succèdent dans les discours des interlocuteurs, chacune s’érigeant comme un point de comparaison pour les deux autres : la première est une sorte d’époque immémoriale pendant laquelle les premiers arrivants, vivant chichement et dépendant de la pluie divine pour leurs cultures, se seraient approprié les terres de ce plateau présenté comme désertique ; la seconde est caractérisée par une mainmise de l’Etat sur les terres et un contrôle des personnes qui s’accompagne d’un sentiment de sécurité et de prise en charge au sein d’une collectivité hiérarchisée ; la troisième est marquée par une augmentation des marges d’enrichissement mais également une dégradation des services publics et une précarisation des plus démunis dans un contexte plus concurrentiel, d’où une instrumentalisation des identités pour légitimer ou exclure de l’accès aux ressources. / How did the dwellers experience the implementation of the Al-Assad State Farm, a large-scale collectivised irrigation project in the 1970s, and its subsequent dismantling two decades later ? These two events reshaped living and working conditions, public service delivery, land use, the physical environment and landscape. Interlocutors’ discourse construes three successive periods, with each one as a point of comparison for the two others: the first, “time immemorial”, during which first comers, frugal and dependent upon Providence for rain for agriculture, appropriated plateau lands, described as a part of the desert. The second period was characterised by State seizing of the lands and control of both space and dwellers. In parallel this hierarchical community structure produced a sense of security and State support. The third was a period of relative increase in wealth, a degradation of public services, and the social exclusion of impoverished people due to a more competitive context. Exclusion from and access to resources was legitimised through the instrumentalisation of identity.

Typescript (photocopy). / Digitized by Kansas Correctional Industries

Submitted by KAROLINE MASO DOS REIS null (karol.mazzo6@gmail.com) on 2017-03-20T13:16:01Z No. of bitstreams: 1 Dissertação_Karoline_Maso_dos_Reis.pdf: 1005977 bytes, checksum: f47d40d873464a065d6892ce5e68a6c3 (MD5) / Rejected by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo a orientação abaixo: O arquivo submetido não contém o certificado de aprovação. Corrija esta informação e realize uma nova submissão com o arquivo correto. Agradecemos a compreensão. on 2017-03-22T13:21:27Z (GMT) / Submitted by KAROLINE MASO DOS REIS null (karol.mazzo6@gmail.com) on 2017-03-23T00:00:22Z No. of bitstreams: 1 Dissertação_Karoline_Maso_dos_Reis.pdf: 1561143 bytes, checksum: a96dd6f917463095d83e367b00fef73b (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-03-23T16:36:30Z (GMT) No. of bitstreams: 1 reis_km_me_jabo.pdf: 1561143 bytes, checksum: a96dd6f917463095d83e367b00fef73b (MD5) / Made available in DSpace on 2017-03-23T16:36:30Z (GMT). No. of bitstreams: 1 reis_km_me_jabo.pdf: 1561143 bytes, checksum: a96dd6f917463095d83e367b00fef73b (MD5) Previous issue date: 2017-02-21 / A caracterização da distribuição de água por tubo gotejador é imprescindível para a irrigação. E, a falta de conhecimento desse fator leva a impactos econômicos e ambientais. O objetivo deste trabalho foi avaliar a uniformidade de distribuição e vazão de um tubo gotejador em condição de irrigação superficial e subsuperficial. Utilizou-se o tubo gotejador Drip Net PCTM AS 16150, com delineamento experimental no esquema fatorial 5 x 5, com quatro repetições. Os tratamentos foram constituídos da combinação de 5 profundidades de submersão do tubo gotejador (0; 10; 20; 30 e 40 cm) e 5 pressões de entrada da água no tubo gotejador (49, 98, 147, 196 e 245 kPa). O menor coeficiente de uniformidade de distribuição obtido foi de 95,55% e o menor coeficiente de uniformidade de Christiansen, 96,37%, sendo classificados como excelentes de acordo com Merriam e Keller (1978) e Mantovani (2002), respectivamente. O coeficiente de variação de fabricação ficou dentro da regulamentação, ABNT NBR ISO 9261, sendo menor que 7%. As vazões em subsuperfície apresentaram-se mais próximas da vazão nominal do tubo gotejador do que a vazão em superfície, indicando bom desempenho do tubo gotejador para irrigação em subsuperfície. / The characterization of the water distribution by dripping tube is essential for irrigation. And, lack of knowledge of this factor leads economic and environmental impacts. The objective of this research was to evaluate the uniformity of distribution and flow of a dripper tube in surface and subsurface irrigation conditions. The Drip Net PCTM AS dripping tube 16150 was used, with experimental design in a 5 x 5 factorial scheme, with four replications. The treatments consisted of the combination of 5 submersion depths of the dripper tube (0, 0.1, 0.2, 0.3 and 0.4 m) and 5 inlet pressures of the water in the dripper tube (49, 98, 147, 196 and 245 kPa). The lowest coefficient of uniformity of distribution was 95.55% and the lowest coefficient of uniformity of Christiansen, 96.37%, being classified as excellent according to Merriam and Keller (1978) and Mantovani (2002), respectively. The coefficient of variation of manufacturing was within the regulation, ABNT NBR ISO 9261, being less than 7%.The subsurface flow rates were closer to the nominal flow rate of the dripping tube than to the surface flow rate, indicating a good performance of the drip tube in subsurface.

Thesis (M. Sc. (Agricultural Management)) -- University of LImpopo, 2002 / Refer to document / NRF (National Research Foundation) and WRC (Water Research Commission)