Membrane concentration was modeled using similitude and dimensional analysis. Pertinent variables selected by this methodology were used to determine a series of dimensionless products to describe and model mass transport through the membrane. The general model generated contain…
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The increasing use of water for irrigation, industry and municipal water supplies has led to an increasing need for careful planning for the usable water resources. Skilled planning and careful management are essential to achieve the level of efficiency in water use desired. Eff…
Scope and method of study. The objective of the study is to explore the impacts of devaluation on the structure of the Indonesia economy. In particular, emphasis was placed on the impact of devaluation on the agriculture and related sectors. To achieve the objective, a computabl…
This study presents applications of Geographic Information Systems for land planning and natural resource management. It provides theoretical and practical answers regarding its relevance, appropriateness, and sustainability in Burkina Faso, Chad, The Gambia, Mali, Mauritania, N…
In the dry season 1990, a farm survey and field experiments were carried out in Indramayu, West Java, Indonesia to evaluate the technical and economic factors of rice thresher mechanization. A system analysis approach was used to determine the optimum thresher size, the economic…
Thatched mat fences were tested as windbreaks to protect millet (Pennisetum thyphoides, Burm) crop in the arid region of Sokoto State, Nigeria. The effects of the fence windbreaks, set up in three porosities (0%, 30%, and 50%), on millet growth, water use and yield were investig…
Four tillage systems were used to measure the effects of tillage-induced changes on bulk density, penetration resistance, soil temperature, moisture content, surface roughness, and aggregate mean weight diameter. The four systems included, five passes with a cultivator, one pass…
The purpose of this research was to investigate the effects of various static weight distributions, hitch point locations, drawbar loads and traction surfaces on the torque split between the front and rear axles and traction efficiency of four wheel drive tractors. An automatic …
Nitrogen (ammonium-('15)N) absorption studies were made on cotton (Gossypium hirsutum L. var. Deltapine 61) grown in complete Hoagland nutrient solution in pots with various concentrations of NaCl (0, 4, 8, and 12 bars osmotic pressure). Two different stages of growth, vegetativ…
In a country like Saudi Arabia where water is premium and brackish, trickle irrigation systems become an attractive alternative for conserving water. Usually microtubes are used as emiters in the trickle irrigation network to deliver the same amount of water throughout the netwo…
The potential of granular zeolites as a heating medium for drying corn was evaluated in a batch type experimental dryer. At temperatures from 150-250°C and residence times of 3-8 minutes, synthetic zeolites (4A and 13X) removed 9-18 percentage points from the initial moisture of…
A computer model was developed primarily to help formulate irrigation strategies for areas where saline waters of questionable quality may be an option for crop production. The model estimates salt and water balance in the soil profile and predicts crop growth, given a certain i…
As the water supply for irrigation becomes limited and expensive, techniques for more efficient capture and retention of natural precipitation become a more important part of crop production strategy. Furrow diking, a tillage practice of making small dams across furrows, is an e…
A tillage reference implement (TRI) concept to predict and compare draft requirements for tillage implements was developed. The reference implement concept was based on implement draft and soil and implement scale factors. The scale factors consist of a soil scale factor, implem…
The primary goal of this research study was to scrutinize and identify the effects of cottonseed oil, used as a fuel, on the performance and wear of diesel engines. The study was initiated by selecting two new single cylinder diesel engines and operating them simultaneously (one…
The government of Egypt is conducting a number of improvement programs on the nation's irrigation system for the purpose of increasing agricultural productivity. One aspect of this effort is to work with farmers to better manage the system at the farm canal (mesqa) level of oper…
Due to the unlimited support by the government of Saudi Arabia, the agricultural development has jumped dramatically during the last 17 years. The country has reached the self-sufficient position in producing the most needed crops and surpassed it by exporting some products like…