الفهرس 
ContentsOnly 14 pages are availabe for public view
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Abstract
The population of Egypt is increasing very rapidly , and the additional population needs improved methods of agricultural production. Means of increasing agricultural production may be divided into extending the Egyptian lands and increasing agricultural efficiency and crop yields.It is already impossible to increase production slowly by an enlargment of the Egyptian lands. The only means, there- fore , of increasing production is through increased effi¬ciency and use of fertilizers • Egypt is rather fortunate in having available phos¬phate rock. Only small proportion of the total’ quantity of phosphate rock mined and marketed is consumed directly in a raw or unprocessed state; the vast bulk is chemically treated and converted into fertilizer and a wide variety of finished products that play a vital role in national economy . Egypt obtains the fertilizers it requires by produc¬ing and importing nitrogen fertilizers and producing phos¬phate fertilizers, but for fertilizers which it does not produce, it depends entirely upon imports 0 Normal superphosphate is manufactured locally by acid ulating ground rock phosphate with su sesses large deposits of rock phosphate but limited ntities of sulphur. As a result of the rapid world wide sulphur and short supply in many as, the delivery prices of sulphur for Egyptian ferti¬doubled about three times during the last It is therefore natural that Egyptian fertilizer manu¬a close look at processes that require or no sulphur, the most attractive of which is known itrophosphates or nitric phosphate, in which rock phos e is treated with nitric acid. The cost of this acid fall because of the availability of natural and the technological improvements in conver¬ammonia to nitric acid. Moreover, the nitrate ion nutrient nitrogen anp ends up in a product, either phosphate or in a coproduct nitrogen fertilizer, ~eas in sulphuric acid treatments, the sulphate ion es no useful purpose and the gypsum formed having very nutrient value dilute the product. Simple acidulation of rock phosphate with nitric acid, not the suitable. The fertilizer produced is conveniently usable since it is extremely hygroscopic