THE IMBACT OF DEMONSTRATION PRACTICE IN THE DEVELOPMENT OF THE KNOWLEDGE OF AGRICULTURAL EXTENSION WORKERS IN SOME TECHNIQUES OF AGRICULTURAL WASTE RECYCLING IN SOME DELTA GOVERNORATES أثر الإیضاح العملى بالممارسة فى تنمیة معارف المرشدین الزراعیین فى بعض أسالیب تدویر المخلفات الزراعیة ببعض محافظات الدلتا
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