THE LEVEL OF KNOWLEDGE FOR AGRICULTURAL EXTENSION WORKERS TOWARDS RATIONALITY OF AGRICULTURAL CHEMICAL USE FOR PRODUCTION OF HORTICULTURE PRODUCTS IN ISMAILIA GOVERNORATE المستوى المعرفى للمرشدین الزراعیین نحو ترشید استخدام الکیماویات الزراعیة فى إنتاج الحاصلات البستانیة بمحافظة الإسماعیلیة
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