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contour Laser Guiding for the Mechanized ＂Vallerani＂ micro-catchment Water Harvesting Systems

Journal of Environmental Science and Engineering 2011年第10期5卷 1309-1316页

作者： I.A. Gammoh T.Y. Oweis Department of Horticulture and Crop Sciences Faculty of Agriculture University of Jordan Amman 11942 Jordan International Center for Agricultural Research in the Dry Areas （ICARDA） Aleppo Syria

Mechanized construction of micro-catchments for water harvesting （WH） was successfully tested in the Badia （dry rangeland） areas in Syria and Jordan, using the ＂Vallerani＂ plow, model Delfino （50 MI/CM）, manufactured by Nardi, Italy. The plow was able to construct intermittent and continuous contour ridges, and could potentially be used to rehabilitate degraded rangelands. However, one major issue for large-scale implementation is the high cost and time required to manually identify contours for the plow to follow. Most existing auto-guiding systems, as usually used in road construction and agricultural land leveling, were expensive or impractical. The objective, therefore, was to add, adapt, and evaluate an auto-guiding system to enable a tractor to follow contours without demarcation through conventional surveying. A low-cost contour Laser Guiding （CLG） system, with specifications that suit the contour ridging in undulating topographic conditions of dry rangelands, was chosen, adapted, mounted, and tested, under actual field conditions. The system consisted mainly of a portable laser transmitter and a tractor-mounted receiver, connected to a guidance display panel. The system was field-tested on 95 ha of land where the system capacity was determined under different terrains, slopes （1-8%）, and ridge spacings （4-12 m）. The easy adaptation and implementation of the CLG to the ＂Vallerani＂ unit tripled the system capacity, improved efficiency and precision, and substantially reduced the cost of constructing micro-catchments for WH. The system is recommended for large-scale rangeland rehabilitation projects in the dry areas, not only in West Asia, but worldwide.

关键词： Badia land degradation contour micro-catchments laser guiding Vallerani system.

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Performance and Adaptation of the Vallerani Mechanized Water Harvesting System in Degraded Badia Rangelands

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Journal of Environmental Science and Engineering 2011年第10期5卷 1370-1380页

Rainwater harvesting in micro-catchments such as contour ridges and semicircular bunds is an option for utilizing the limited rainfall, improving productivity and combating land degradation in dry rangeland areas （Badia）. However, implementation of this practice using manual labor or traditional machinery is slow, tedious and costly, and often impractical on a large scale. These limitations can be overcome using the ＂Vallerani＂ plow for quickly constructing continuous and intermittent ridges. The plow （model Delfino （50 MI/CM）, manufactured by Nardi, Italy） was tested and adapted to dry steppe （Badia） conditions in Jordan. The performance of the machine, its weaknesses and potential improvements were assessed in the 2006/07 season at three sites on 165 hectares of various terrain, slope and soil conditions. The performance parameters included effective field capacity （EFC）, machine efficiency （ME） and fuel consumption （FC）. Field tests were carried out at different tractor （134 HP） traveling speeds, pit sizes and contour spacings. Overall mean performance indicators gave an EFC of 1.2 ha/h, 51% ME and an average FC of 5.15 liter/ha. Increasing ridge spacing had a small effect on ME where, increasing traveling speed had a greater effect. A guide table was developed, relating performance parameters with ridge spacing, speed, and bund size setting. This could be a useful reference for the implementation and management of mechanized micro-catchment construction in the Badia. The system performed well in the construction of continuous ridges. However, it was unable to construct intermittent ridges at speeds over 4km/h; problems were encountered in properly staggering the bunds at successive contours.

关键词： Land degradation contour micro-catchments Vallerani system machine capacity machine efficiency Badia.

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