EFFECT OF NATURAL ORGANIC CONDITIONERS ADDITION ON SOME PROPERTIES OF A CALCAREOUS SOIL, ITS AVAILABLE CONTENT OF SOME NUTRIENTS AND THEIR UPTAKE BY BARLEY PLANT GROWN THEREON. I- PHYSICALAND CHEMICAL PROPERTIES. Egypt. J. Agric. Res., 2(1):35-58 EFFECT OF NATURAL ORGANIC CONDITIONERS ADDITION ON SOME PROPERTIES OF A CALCAREOUS SOIL, ITS AVAILABLE CONTENT OF SOME NUTRIENTS AND THEIR UPTAKE BY BARLEY PLANT GROWN THEREON. I- PHYSICALAND CHEMICAL PROPERTIES. Egypt. J. Agric. Res., 2(1):35-58 Effect of natural organic conditioners addition on some properties of a calcareous soil, its available content of some nutrients and their uptake by barley plant grown thereon. II- effect on contents of available n, p, and k, barley growth and nutrients uptake. Egypt. J. Agric. Res., 2(2):491-509.